Relevant bibliographies by topics / Lanthana

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Lanthana'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Lanthana"

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BIRD, R. "Reactions of alkenes on lanthana." Journal of Catalysis 105, no. 1 (May 1987): 199–212. http://dx.doi.org/10.1016/0021-9517(87)90019-4.

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Subramanian, S., M. S. Chattha, and C. R. Peters. "Characterization of lanthana/alumina composite oxides." Journal of Molecular Catalysis 69, no. 2 (October 1991): 235–45. http://dx.doi.org/10.1016/0304-5102(91)80148-v.

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Inman, Ronald, Steven A. Schuetz, Carter M. Silvernail, Snjezana Balaz, Peter A. Dowben, Gregory Jursich, James McAndrew, and John A. Belot. "Atomic layer deposition of lanthana thin films using high-purity lanthanum amino precursors." Materials Chemistry and Physics 104, no. 2-3 (August 2007): 220–24. http://dx.doi.org/10.1016/j.matchemphys.2007.03.002.

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Putna, E. S., B. Shereck, and R. J. Gorte. "Adsorption and reactivity of lanthana with CO." Applied Catalysis B: Environmental 17, no. 1-2 (June 1998): 101–6. http://dx.doi.org/10.1016/s0926-3373(98)00006-x.

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BROWN, FRANK H., and POL DUWEZ. "The Systems Zirconia-Lanthana and Zirconia-Neodymia." Journal of the American Ceramic Society 38, no. 3 (June 2, 2006): 95–101. http://dx.doi.org/10.1111/j.1151-2916.1955.tb14584.x.

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Iorio, L. E., B. P. Bewlay, and M. Larsen. "Inclusion Characterization of Lanthana-Doped Molybdenum Wire." Microscopy and Microanalysis 9, S02 (July 19, 2003): 600–601. http://dx.doi.org/10.1017/s1431927603443006.

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Bernal, S., F. J. Botana, J. J. Calvino, G. Cifredo, R. García, S. Molina, and J. M. Rodríguez-Izquierdo. "HREM characterization of lanthana-supported rhodium catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 246–47. http://dx.doi.org/10.1017/s0424820100174369.

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Metals supported on rare earth sesquioxides present a non- conventional behavior. Ordinary H2 and-or CO chemisorption techniques cannot be straightforwardly used to characterize this group of catalysts. The assessement to the data of metallic dispersions and the establishment of the occurrence and extent of metal-support interaction phenomena are determinant in order to interpret the properties of these catalysts in hydrogenation reactions. In this work HREM is proposed as a powerfull technique for the study of lanthana supported rhodium catalysts. Such catalysts would be considered as representative of a series of metals supported on rare earth sesquioxides.
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Lacombe, S., C. Geantet, and C. Mirodatos. "Oxidative Coupling of Methane over Lanthana Catalysts." Journal of Catalysis 151, no. 2 (February 1995): 439–52. http://dx.doi.org/10.1006/jcat.1995.1046.

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Lacombe, S., H. Zanthoff, and C. Mirodatos. "Oxidative Coupling of Methane over Lanthana Catalysts." Journal of Catalysis 155, no. 1 (August 1995): 106–16. http://dx.doi.org/10.1006/jcat.1995.1192.

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Aizenshtein, Michael, Tatiana Y. Shvareva, and Alexandra Navrotsky. "Thermochemistry of Lanthana- and Yttria-Doped Thoria." Journal of the American Ceramic Society 93, no. 12 (September 29, 2010): 4142–47. http://dx.doi.org/10.1111/j.1551-2916.2010.04001.x.

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Dissertations / Theses on the topic "Lanthana"

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Brown, Jared C. "UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3222.

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Hydrogen is a vital component in several different chemical reactions as well as a potential fuel source for the future. The water gas shift (WGS) reaction converts CO and water to hydrogen and CO2. The objective of this work is to first, characterize the potential benefits of the addition of lanthanum oxide (lanthana) to the iron-chromium-copper (Fe-Cr-Cu) oxide catalysts industrially used in high temperature water gas shift processes, and second, analyze these catalysts using in-situ UV-Visible spectroscopy. The benefits of each component in the catalyst are discussed as well as potential benefits from the addition of lanthana. Lanthana is a rare earth oxide that dramatically increases the surface area of the iron based WGS catalysts, and small concentrations of other rare earth oxides (i.e. cerium) have been shown to increase the rate of desorption of CO2 from iron surfaces (Hu Yanping 2002). Lanthana has similar chemical properties to other rare earth oxides tested and has not been previously tested as an additive to the WGS catalyst. Therefore catalysts with 0, 1, 2, 5, 10, and 20 wt% lanthana were made via a co-precipitation method in order to measure changes in activity, physical stability, and thermal stability. Catalyst characterization techniques utilized include electron dispersive X-ray spectroscopy (EDX), temperature programmed reduction (TPR) with hydrogen, and nitrogen physisorption (BET). The kinetic analysis was performed utilizing both mass spectroscopy (MS) and gas chromatography (GC). The addition of 1 wt% lanthana to the Fe-Cr-Cu catalysts increases WGS reaction rates of the catalyst at 425°C and 350°C, however the 0% La catalyst has the highest rates at 375°C and 400°C. The 0% La catalyst shows significant drop off in rate at 425°C, suggesting that the lanthana provides a small thermal stabilizing, i.e. the addition of lanthana prevents catalyst sintering at higher temperatures. Traditionally, chromia acts as the sole thermal stabilizer in these catalysts. The addition of large amounts of lanthana inhibits the chromia stabilizing effect, however small additions of lanthana appear to have an additional catalyst promotional effect without interfering with the chromia thermal stabilization. The increased WGS reaction rates at higher temperatures could allow for greater throughput of reactants in industrial settings. Higher concentrations of lanthana decrease the activity due to what is believed to be disruption of the chromia stabilizing effect as well as reduced amount of the active phase of catalyst. In-situ UV-Visible analysis shows that the oxidation state of the iron in the catalyst has a direct correlation to the UV-Visible light absorbance of the surface of the iron catalyst. Extent of reduction is traditionally measured with a synchrotron which is significantly more expensive than UV-Vis spectroscopy. This study uses the more economical UV-Vis spectrometer to determine similar information. The lanthana doped catalysts show an over-reduction of iron during WGS conditions (i.e. rapid reduction of Fe2O3 to Fe3O4 and FeO).
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Hallac, Basseem Bishara. "Kinetic Experimental and Modeling Studies on Iron-Based Catalysts Promoted with Lanthana for the High-Temperature Water-Gas Shift Reaction Characterized with Operando UV-Visible Spectroscopy and for the Fischer-Tropsch Synthesis." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4271.

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The structural and functional roles of lanthana in unsupported iron-based catalysts for the high-temperature water-gas shift reaction and Fischer-Tropsch synthesis were investigated. The performance of the catalysts with varying lanthana contents was based on their activity, selectivity, and stability. With regard to the former reaction, extent of reduction of the iron in Fe2O3/Cr2O3/CuO/La2O3 water-gas shift catalysts is a key parameter that was characterized using UV-visible spectroscopy. Minor addition of lanthana (<0.5 wt%) produces more active and stable catalysts apparently because it stabilizes the iron-chromium spinel, increases the surface area of the reduced catalysts, enhances the reduction of hematite to the magnetite active phase, and facilitates the adsorption of CO on the surface of the catalyst modeled by an adsorptive Langmuir-Hinshelwood mechanism. Statistical 95% confidence contour plots of the adsorption equilibrium constants show that water adsorbs more strongly than CO, which inhibits the reaction rate. A calibration curve that correlates the oxidation state of surface iron domains to normalized absorbance of visible light was successfully generated and applied to the water-gas shift catalysts. UV-visible studies indicated higher extent of reduction for surface Fe domains for the catalysts promoted with 1 wt% of lanthana and showed potential to be a more convenient technique for surface chemistry studies than X-ray absorption near edge spectroscopy (XANES). Lanthana addition to iron-based Fischer-Tropsch catalysts enhances the olefin-to-paraffin ratio, but decreases their activity, stability, and selectivity to liquid hydrocarbons. Adding lanthana at the expense of potassium reduces the water-gas shift selectivity and enhances the activity and stability of the catalysts. Finally, a model that simulates heat and mass transfer limitations on the particle scale for the Fischer-Tropsch reaction applicable at lab-scale suggests optimal operating and design conditions of 256°C, 30 bar, and 80 mirons are recommended for higher selectivity to liquid hydrocarbons. The model considers pressure drop, deactivation, pore diffusion, film heat transfer, and internal heat transfer when solving for the optimal conditions, and maps them as functions of design variables. This model can be up-scaled to provide guidance for optimal design of commercial-size reactors.
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Cordeiro, Guilherme Luís. "Estudo de síntese de catalisadores de níquel suportados em alumina-lantânia para aplicação na produção de hidrogênio a partir da reforma a vapor do etanol." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-23032015-143913/.

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O uso do hidrogênio, como vetor energético, representa uma opção promissora a fim de se reduzir a dependência dos combustíveis fósseis e controlar a emissão de poluentes na atmosfera. Atualmente, uma das rotas mais propícias para produção de hidrogênio envolve a reação de reforma a vapor de álcoois utilizando-se catalisadores de níquel suportados em alumina. O níquel é amplamente utilizado em catálise devido ao baixo custo e à elevada atividade para ruptura da ligação C-C. A alumina, por sua vez, promove maior dispersão do metal ativo devido aos valores elevados de área superficial das estruturas cristalinas de transição, sobretudo da fase gama, característica esta diretamente relacionada às condições de síntese. A incorporação de lantânia, como aditivo, tem sido considerada por moderar a acidez da superfície do suporte e minimizar a deposição de carbono no catalisador durante a reação de reforma. Tendo em vista que a atividade dos catalisadores na reação de reforma é função das características físicas e químicas desses materiais, avaliou-se, no presente trabalho, a rota de síntese por coprecipitação de hidróxidos em associação ao uso de surfactante e tratamento solvotérmico. A rota de mistura de pós de óxido de níquel com alumina, ambos preparados por precipitação individual, foi adotada para comparação dos resultados obtidos por coprecipitação. Nas condições otimizadas do processo, estudou-se o efeito da adição de óxido de lantânio nas propriedades dos materiais sintetizados. Verificou-se que o método de coprecipitação permitiu a obtenção de óxidos mistos com elevada área superficial (na faixa de 170 a 260 m2g-1), ao passo que a mistura de óxidos conduziu à formação de pós constituídos por fases distintas de alumina e óxido de níquel, com menor área superficial (na faixa de 60 a 180 m2.g-1). Após avaliação do comportamento de redução do óxido de níquel contido nesses materiais, as propriedades dos pós obtidos foram correlacionadas com o desempenho na produção de hidrogênio pela reforma do etanol. De acordo com os resultados, o catalisador preparado por coprecipitação apresentou menor atividade na produção de hidrogênio, comparativamente aos materiais obtidos por coprecipitação em associação com tratamento solvotérmico e mistura de óxidos. Em contraste, verificou-se uma menor quantidade de carbono acumulado sobre o catalisador preparado por coprecipitação, indicativo da elevada estabilidade catalítica deste material durante a reação de reforma.
Hydrogen use as an energy vector represents a promising option in order to reduce the dependence on fossil fuels and to control the emission of pollutants into the atmosphere. Nowadays, one of the most important routes for hydrogen production includes steam reforming reactions of alcohols over alumina-supported nickel catalysts. Nickel is largely applied in catalysis because of its low cost and high activity for C-C bond rupture. Alumina, in turn, promotes appropriate dispersion of the active metal due to the high surface area values of its transition crystalline structures, especially gamma phase. These characteristics are related to synthesis conditions. Incorporation of lanthana as an additive has been considered to control alumina surface acidity and to inhibit catalyst deactivation by carbon deposition during reforming reaction. Considering that catalyst activity is a function of materials physical and chemical properties, it was evaluated in this work powder synthesis route by coprecipitation in association with surfactant templating method and solvothermal treatment. Mechanical milling of nickel oxide and alumina powders, which were individually prepared by chemical precipitation, was adopted for comparison purposes. Under optimized preparation conditions, the effect of lanthanum oxide addition on the materials properties was studied. It was verified that coprecipitation allowed the production of high surface area mixed oxides (170-260 m2g-1). Mechanical mixture led to the formation of materials constituted by alumina and nickel oxide phases, with low surface area (60-180 m2.g-1). After evaluation of nickel oxide reduction behavior, in hydrogen atmosphere, a correlation between properties and performance in hydrogen production by ethanol steam reforming was established. According to the results, the catalyst prepared by coprecipitation was less active for hydrogen generation compared to the ones obtained by coprecipitation followed by solvothermal treatment and mechanical milling methods. In contrast, the lowest amount of carbon deposits was found on the catalyst prepared by coprecipitation, which is an indicative of the high catalytic stability during reforming reaction.
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Boujamaa, Rachid. "Caractérisations physico-chimiques et électriques d’empilements de couches d’oxyde à forte permittivité (high-k) / grille métallique pour l’ajustement du travail effectif de la grille : application aux nouvelles générations de transistors." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT100.

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Cette thèse s'inscrit dans le cadre du développement des technologies CMOS 32/28nm chez STMicroelectronics. Elle porte sur l'étude d'empilements de grille métal/diélectrique high-k élaborés selon une stratégie d'intégration Gate First, où le couple TiN/HfSiON est introduit avec une couche interfaciale SiON et une encapsulation de la grille TiN par du polysilicium. Cette étude s'est principalement focalisée sur l'analyse des interactions entre les différentes couches constituant les empilements, en particulier des additifs lanthane et aluminium, employés pour moduler la tension de seuil Vth des transistors NMOS et PMOS respectivement. Les analyses physico-chimiques réalisées au cours de ces travaux ont permis de mettre en évidence la diffusion en profondeur des éléments La et Al à travers le diélectrique de grille HfSiON sous l'effet du recuit d'activation des dopants à 1065°C. Les résultats obtenus ont montré que ce processus de diffusion entraine une réaction du lanthane et de l'aluminium avec la couche interfaciale de SiON pour former un silicate stable La(ou Al)SiO au profit de la couche de SiON. L'analyse des propriétés électrique des structures MOS a permis de révéler que la présence d'atomes La ou Al proximité de l'interface HfSiON/SiON conduit à la présence d'un dipôle généré à cette interface, qui a pour effet de décaler le travail de sortie effectif de la grille métallique
This thesis is part of the development of CMOS technologies 32/28nm STMicroelectronics. It focuses on the study of stacks of metal / high-k dielectric prepared by an integration strategy Gate First , where the couple TiN / HfSiON gate is introduced with an interfacial layer SiON and encapsulation of TiN gate polysilicon by . The study was mainly focused on the analysis of interactions between the various layers forming the stacks , in particular lanthanum and aluminum additives , used for modulating the threshold voltage Vth of the PMOS and NMOS transistors respectively . The physico-chemical analyzes in this work helped to highlight the depth distribution of the elements La and Al through the HfSiON gate dielectric under the influence of dopant activation annealing at 1065 ° C. The results obtained showed that this diffusion process causes a reaction of lanthanum and aluminum with the interfacial layer of SiON to form a stable silicate La ( or Al ) SiO benefit of the SiON layer . The analysis of electrical properties of MOS structures revealed that the presence of the atoms near the Al or HfSiON / SiON interface leads to the presence of a dipole generated at this interface , which has the effect of shifting actual output work of the metal gate
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Dahdah, Eliane. "The role of Mg-Al hydrotalcite derived mixed oxides as catalytic support materials : Applications in the transesterification of vegetable oils for biodiesel production and in the steam reforming of glycerol for hydrogen production." Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0498/document.

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Ce travail vise à étudier la transestérification de l'huile de tournesol pour la production de biodiesel et le vaporeformage du glycérol pour la production d'hydrogène renouvelable. Les oxydes mixtes Mg-Al prépares par voie hydrotalcite ont été choisis comme supports catalytiques. Pour la production de biodiesel, les effets du traitement thermique et de la méthode de préparation pour l'incorporation de calcium ont été étudiés. Le catalyseur Ca600/Mg₄Al₂HT calciné à 600°C, préparé par imprégnation de 40 wt% de Ca sur le support Mg₄Al₂ non calciné, a montré les meilleures performances catalytiques en raison de ses propriétés basiques améliorées. Pour le vaporeformage catalytique du glycérol, l'activité des oxydes de métaux purs imprégnés par le Ni a d'abord été étudiée, puisque les oxydes de métaux purs sont souvent utilisés comme supports catalytiques. Le catalyseur Ni/ZrO₂ s'est révélé le plus efficace pour la production d'hydrogène. Pour le vaporeformage du glycérol en présence d'oxydes mixtes obtenus par voie hydrotalcite, les catalyseurs au Ru-Mg-Al ont été étudiés. L'effet de la méthode de préparation (imprégnation ou greffage) sur l'activité catalytique a été étudié. Le catalyseur préparé par imprégnation permettait une plus grande accessibilité à la phase active. Pour des catalyseurs Ni-Mg-Al, les supports ont été modifiés par du lanthane. Le catalyseur Ni/Mg₆Al₁.₆La₀.₄ était le plus performant en raison de sa basicité accrue et de son interaction métal-support. Les activités des catalyseurs Ni/ZrO₂ et Ni/Mg₆Al₁.₆La₀.₄ ont été comparées. Les deux catalyseurs ont produit des rendements en hydrogène similaires. Moins de coke a été produit sur le catalyseur préparé par voie hydrotalcite, en raison de sa basicité supérieure. Un test de stabilité à 600°C a montré la désactivation du catalyseur Ni/Mg₆Al₁.₆La₀.₄ après 6 heures. Lors de l'optimisation des conditions de réaction sur le catalyseur Ni/Mg₆Al₁.₆La₀.₄, une amélioration significative de la stabilité a été observée, étendant ainsi sa durée de vie à 24 heures
This work aims to study the transesterification of sunflower oil for biodesel production and the steam reforming of glycerol for renewable hydrogen production. Mg-Al hydrotalcite derived mixed oxides were chosen as catalytic support materials given their known basicity, thermal stability and low cost. Only one active phase was studied for biodiesel production (Ca) and two different active phases (Ru and Ni) for glycerol steam reforming. The various prepared catalysts were characterized by different techniques such as X-Ray Diffraction (XRD), specific surface area determination by BET method, Fourier Transform Infrared Spectroscopy (FTIR), H₂-Temperature Programmed Reduction (H₂-TPR), CO₂-Temperature Programmed Desorption (CO₂-TPD) and Simultaneous Thermogravimetric-Differential Scanning Calorimetry (TG-DSC). For biodiesel production, the effects of thermal treatment and the preparation method for Ca incorporation were both studied. The catalyst that showed the best catalytic performance was an uncalcined Mg₄Al₂ support impregnated with 40 wt% Ca followed by a calcination at 600°C (Ca/600Mg₄Al₂HT) due to its enhanced basic properties. After several optimization steps over this catalyst, the optimum conditions for biodiesel synthesis were: a methanol to oil molar ratio of 15:1, a catalyst to oil ratio of 2.5 wt% and a reaction time of 6 hours which gave a FAME yield of 95%. The properties of the produced biodiesel were studied and found to be in good agreement with ASTM (American Society for Testing and Materials) requirements. For the catalytic steam reforming of glycerol, the activity of NI-based pure metal oxides (Ni/CeO₂, Ni/Y₂O₃, Ni/ZrO₂) was first studied as pure metal oxides are commonly used as support materials. The effect of the support was evaluated and the Ni/ZrO₂ catalyst was found to be the most efficient for hydrogen production. To study the effect of the zirconia phase, a tetragonal Ni/ZrO₂ was also prepared. The tetragonal catalyst was less active for hydrogen production compared to the monoclinic catalyst. A stability test at 600°C also showed the desactivation of the tetragonal Ni/ZrO₂ after 6 hours on stream. For the catalytic steam reforming of glycerol using Mg-Al hydrotalcite derived mixed oxides, Ru-based Mg-Al catalysts were first studied. The effect of the preparation method (impregnation vs grafting) on the catalytic activity of Ru-Mg-Al catalysts was studied. The catalyst prepared by the impregnation method resulted in a better catalytic activity than the catalyst prepared by the grafting method as it allowed a higher accessibility of the active phase. For the Ni-based Mg-Al catalysts, the hydrotalcite supports were modified with La to study the effects of promoter addition on catalytic properties and activity. The bimetallic effect (1%Ru-5%Ni) and effect of a higher Ni loading (15 wt%) were also studied. The 5 wt% Ni impregnated on a La modified Mg-Al support (Ni/Mg₆Al₁.₆La₀.₄) catalyst was the most efficient for hydrogen production due to its enhanced basicity and metal-support interaction. The activities of the most efficient catalysts, Ni/ZrO₂ and Ni/Mg₆Al₁.₆La₀.₄, were compared. Both catalysts produced similar hydrogen yields. Differences in glycerol conversion to gaseous products were attributed to a higher formation of liquid by-products over the hydrotalcite support compared to the zirconia support. Nevertheless, less coke was produced over the hydrotalcite catalyst given its higher basicity. A stability test at 600°C showed the desactivation of the Ni/Mg₆Al₁.₆La₀.₄ catalyst after 6 hours on stream. Upon optimization of the reaction conditions on Ni/Mg₆Al₁.₆La₀.₄, a significant improvement in the stability was observed as the catalyst lasted for 24 hours on steam.Therefore, Ni/Mg₆Al₁.₆La₀.₄ could be a promising candidate for industrial application
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Abou, Rached Jihane. "Production d'hydrogène par reformage catalytique du toluène sur des oxydes mixtes Ni-Mg-Al : Effet de l'ajout de cérium ou de lanthane." Thesis, Littoral, 2017. http://www.theses.fr/2017DUNK0442/document.

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Cette thèse a été réalisée dans le cadre de la valorisation des composés organiques volatils (COVs) tels que le toluène. Cette étude vise à mettre au point des catalyseurs efficaces pour l'élimination du toluène par reformage à sec et vaporeformage du toluène. Les solides de type hydrotalcite ont été choisis en raison des propriétés intéressantes des oxydes obtenus par leur calcination. Les catalyseurs à base de Ni, Mg, et Al ont été préparés par voie hydrotalcite. Afin d'améliorer l'activité catalytique, les éléments Ce et La ont été incorporés dans les solides pour substituer une partie de l'élément Al et les effets ont été étudiés. Dans un premier temps, les différents oxydes mixtes ont été caractérisés par différentes techniques physico-chimiques dont la Diffraction des Rayons X (DRX), les Analyses Thermiques (ATD, ATG), la Réduction en Température Programmée (RTP),... Dans un deuxième temps, les différents oxydes mixtes ainsi préparés ont été testés dans les réactions de reformage à sec du toluène. La substitution progressive des ions Mg²⁺ par les ions Ni²⁺ améliore l'activité des catalyseurs. Le cérium ou le lanthane interviennent au niveau du mécanisme réactionnel pour améliorer la sélectivité tout en réduisant le dépôt de carbone. Les performances catalytiques des oxydes sont ensuite testées vis-à-vis de la réaction de vaporeformage du toluène montrant que la réactivité s'améliore avec l'augmentation de la teneur en magnésium. Les promoteurs ont montré un effet sur la conversion et la sélectivité en hydrogène. Selon les caractérisations physico-chimique après test catalytique, les catalyseurs n'ont montré aucune formation de coke. Une comparaison entre le meilleur catalyseur de cette étude et un catalyseur industriel est abordée
This thesis was carried out in the context of the valorization of volatile organic compounds (VOCs) such as toluene. This study aimed to optimize efficient catalysts for the elimination of toluene by dry and steam reforming of toluene. Hydrotalcite solids were chosen because of the interesting properties of the oxides obtained by their calcination. The Ni, Mg and Al-based catalysts were prepared via hydrotalcite road. In order to improve the catalytic activity, the elements Ce and La were incorporated into the solids to substitute a part of the element A1 and the effects were studied. Initially, the mixed oxides were characterized by different physico-chemical techniques including X-Ray Diffraction, Thermal Analysis (TG/DTA), Temperature Programmed Reduction (TPR),... In a second step, the mixed oxides were tested in the dry reforming of toluene reaction. The progressive substitution of Mg²⁺ ions by Ni²⁺ ions improves the activity of the catalysts. Cerium or lanthanum played a role in the reaction mechanism, to improve selectivity and reduce carbon deposition. The catalytic performances of the oxydes are tested in the steam reforming of toluene reaction, showing that the reactivity improves with the increase in the magnesium content. The promoters have enhanced the toluene conversion and hydrogen selectivity. According to the physico-chemical characterizations after the catalytic test, the catalysts showed no coke formation. A comparison between the best catalyst of this study and an industrial catalyst is performed
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Vilasi, Pauline. "Synthèse de nouveaux catalyseurs nanostructurés par dépôts physiques à base de pérovskite de lanthane." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA041.

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Ce travail de thèse est issu d’une collaboration entre les laboratoires de recherche FEMTO-ST de l’université technologique de Belfort-Montbéliard et IRCELYON de l’université Claude Bernard à Villeurbanne. Les objectifs de cette étude portent sur la faisabilité d’élaborer par pulvérisation cathodique magnétron des films minces de cobaltite de lanthane nanostructurés. En effet, ces films présentent des propriétés catalytiques intéressantes pour l’oxydation des composés organiques volatiles comme le propène (C3H6) ou le monoxyde de carbone (CO) qui constituent la principale source de pollution de l’air. Il sera montré dans un premier temps que les cobaltites de lanthane de formule LaCoO3 ne sont pas efficaces pour ce type d’application. La composition chimique de ce matériau sera donc modifiée en y incorporant de l’argent de manière à faire varier les propriétés physico-chimiques des films et d’augmenter leurs performances catalytiques. La morphologie des films est directement impactée par l’introduction de Ag puisqu’elle évolue d’un système dense à un système « nanofilaire ». Une autre série de dépôts sera également élaborée et testée en catalyse constituée de cobaltites de lanthane dopées avec de l’argent mais aussi du cérium. On retiendra alors que les films de LaCoO3 + Ag sont plutôt efficaces et prometteurs puisqu’ils présentent des performances catalytiques se rapprochant de celles du platine (catalyseur de référence). Néanmoins, bien que les films aient toujours cette morphologie nanofilaire, les compositions chimiques des films élaborés à base de LaCoO3 + Ag + Ce doivent être optimisées afin d’augmenter leurs activités catalytiques
This work was made in the frame of a scientific research relationships between the laboratory FEMTO-ST of the Technological University of Belfort-Montbéliard and the laboratory IRCELYON of the Claude Bernard University of Villeurbanne. This study aims at characterizing the feasibility of nanostructured lanthanum cobaltite thin films via magnetron sputtering. Indeed, it is well known these materials have interesting catalytic properties regarding the oxidation of volatile organic compounds such as propene (C3H6) or carbon monoxide (CO), the latter being the main source of air pollution. First, it has been shown that lanthanum cobaltites of formula LaCoO3 are not efficient for this type of application. The chemical composition of this material was then modified by incorporating silver so as to vary the physicochemical properties of the films and increase their catalytic performance. In consequence, the morphology of the films was directly impacted by the introduction of Ag since it evolved from a dense system to a "nanowire" system. Another series of deposits based on cobaltite modified by both silver and cerium additions have been also developed and tested during catalytic tests. It should be noted that the Ag containing thin films of LaCoO3 are rather efficient and then promising since they have catalytic performances close to those of platinum (the reference catalyst). Concerning the Ag and Ce containing perovskite films, although they still have this peculiar nanowired morphology, their chemical compositions have to be optimized in order to increase their catalytic activities
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Regny, Sylvain. "Nanocristaux multifonctionnels pour l'élaboration de sondes biologiques." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI056.

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La médecine s’intéresse de plus en plus à des systèmes nanométriques visant la détection précoce de cellules malignes, le traitement de ces dernières ou la compréhension de mécanismes biologiques. Des nanoparticules fluorescentes et des nanocristaux harmoniques aux propriétés non-linéaires intéressantes ont été étudiés comme agents de contraste pour l’imagerie biomédicale.Dans ce travail, nous avons recherché un matériau non-centrosymétrique dont la matrice permet un dopage d’ions lanthanides afin de développer des sondes multifonctionnelles, c’est-à-dire à la fois luminescentes et harmoniques. Nous nous sommes orientés vers l’iodate de lanthane de phase alpha, α-La(IO3)3, non-centrosymétrique. Dans un premier temps, nous avons développé des synthèses hydrothermales assistées par micro-ondes pour permettre de cristalliser la phase alpha et produire des particules de taille nanométrique (< 100 nm). La présence de nombreux pseudo-polymorphes nécessite le contrôle précis des paramètres de synthèse, en particulier de la température de synthèse, pour obtenir exclusivement des nanoparticules de α-La(IO3)3. L’étude de différents intermédiaires réactionnels (La(IO3)3(OH2), La(IO3)2.66(OH)0.33) nous a permis de mettre en évidence une transformation de phase entre ces composés et la phase α-La(IO3)3. Dans un deuxième temps, nous avons utilisé deux dispositifs optiques permettant de mesurer l’efficacité de génération de second harmonique : l’un permettant l’étude de nanocristaux de α-La(IO3)3 individuels et l’autre utilisant un ensemble de nanocristaux en suspension dans un solvant. Ce dernier, basé sur la diffusion Hyper-Rayleigh, nous a permis de quantifier la réponse non-linéaire de nanocristaux α-La(IO3)3 de diamètre 20-50 nm et de déterminer un coefficient non-linéaire < d > de 8 pm.V-1, comparable aux valeurs obtenues pour d’autres nanocristaux harmoniques tels que BaTiO3 ou LiNbO3. Enfin, nous avons montré la possibilité d’incorporer des ions lanthanides tels que Er3+ et Yb3+ dans ces nanocristaux d’iodate de lanthane, conduisant à des nanocristaux de α-La1-x-yYbyErx(IO3)3. Ces nanocristaux sont toujours actifs en génération de second harmonique et émettent simultanément un signal de photoluminescence. Ainsi, pour une excitation dans le proche infra-rouge (800 nm ou 980 nm par exemple), nous avons observé simultanément un signal de second harmonique et de photoluminescence par up-conversion. Nous avons démontré l’intérêt d’un co-dopage Yb3+/Er3+ pour une optimisation du signal d’up-conversion sous une excitation à 980 nm. Ainsi, par un dopage d’ions lanthanides tels que Er3+ et Yb3+, les nanocristaux de α-La(IO3)3 présentent une émission simultanée de génération de second harmonique et de photoluminescence. La combinaison de ces deux propriétés permet d’envisager d’utiliser ces nanocristaux bifonctionnels pour une imagerie par luminescence, technique classique, tout en la couplant avec une imagerie multiphoton, plus coûteuse mais présentant des avantages non-négligeables (rapidité de scans, meilleure sélectivité spatiale, sensibilité à la polarisation)
Medicine is increasingly interested in nanometric systems for the early detection of malignant cells, their treatment or understanding of biological mechanisms. Fluorescent nanoparticles and harmonic nanocrystals with interesting non-linear properties have been studied as contrast agents for biomedical imaging.In this work, we explored a non-centrosymmetric material whose matrix allows a doping of lanthanide ions in order to develop multifunctional probes, i. e. both luminescent and harmonic. We focused on non-centrosymmetric iodate phase: alpha lanthanum iodate, α-La(IO3)3. First, we developed microwave-assisted hydrothermal syntheses to crystallize the alpha phase and produce nano-sized particles (< 100 nm). The presence of many pseudo-polymorphs requires precise control of the synthesis parameters, in particular the synthesis temperature, to obtain exclusively nanoparticles of α-La(IO3)3. The study of different reaction intermediates (La(IO3)3(OH2), La(IO3)2.66(OH)0.33) allowed us to identify a phase transformation between these compounds and the phase α-La(IO3)3. Secondly, we used two optical devices to evaluate the second harmonic generation efficiency of the synthesized α-La(IO3)3 nanocrystals: one set-up allowed us to study individual α-La(IO3)3 nanocrystals and the other used an ensemble of α-La(IO3)3 nanocrystals in suspension in a solvent. The latter, based on Hyper-Rayleigh scattering, quantified the non-linear response of nanocrystals α-La(IO3)3 with a diameter of 20-50 nm and allowed us to determine a non-linear coefficient < d > of 8 pm.V-1, a value comparable to the ones obtained for other harmonic nanocrystals such as BaTiO3 or LiNbO3. Finally, we showed the possibility of incorporating lanthanide ions such as Er3+ and Yb3+ into these lanthanum iodate nanocrystals, leading to α-La1-x-yYbyErx(IO3)3 nanocrystals. These nanocrystals are still active in second harmonic generation and simultaneously emit a photoluminescence signal. Thus, for excitation in the near infrared (800 nm or 980 nm for instance), we simultaneously observed a signal of second harmonic and a photoluminescence signal based on up-conversion processes. We demonstrated the interest of an Yb3+/Er3+ co-doping for an optimization of the up-conversion signal under excitation at 980 nm. Thus, Er3+ and Yb3+-doped nanocrystals of α-La(IO3)3 exhibit simultaneous emission of second harmonic generation and photoluminescence. The combination of these two properties makes it possible to consider using these bifunctional nanocrystals for conventional luminescence imaging, while coupling it with multiphoton imaging, which is more expensive but has significant advantages (scan speed, better spatial selectivity, polarization sensitivity)
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Baudot, Sylvain. "Elaboration et caractérisation des grilles métalliques pour les technologiesCMOS 32 / 28 nm à base de diélectrique haute permittivité." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENT122/document.

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Cette thèse porte sur l'élaboration et la caractérisation des grilles métalliques en TiN, aluminium et lanthane pour les technologies CMOS gate-first à base d'oxyde high-k HfSiON. L'effet de l'épaisseur et de la composition des dépôts métalliques a été caractérisé sur les paramètres de la technologie 32/28nm. Ces résultats ont été reliés à une variation de travail de sortie au vide du TiN, à des dipôles induits par l'Al et le La à l'interface HfSiON/SiON et à leur diminution aux petites épaisseurs de SiON (roll-off). Nous avons montré que l'aluminium déposé sous forme métallique dans le TiN cause une diminution de son travail de sortie, opposée au faible dipôle positif induit par l'Al. Nous avons évalué l'influence du roll-off pour ces différents métaux et mis en évidence pour la première fois sa forte dépendance avec l'épaisseur de lanthane déposée. Le développement de procédés de dépôt de TiN, Al, La a permis d'accroître les bénéfices de ces matériaux pour la technologie CMOS 32/28nm
This thesis is about the manufacturing and the characterization of TiN, aluminum and lanthanum metal gate for high-k based 32/28nm CMOS technologies. The effect of metal gate layer thickness and composition has been characterized on 32/28nm technology parameters. These results have been related to a change in the TiN vacuum work function, to Al- and La- induced dipoles at the HfSiON/SiON interface or their lowering on thin SiON (roll-off). We have shown that metallic aluminum introduced in the TiN metal gate causes a work function lowering, opposed to the weak Al-induced dipole. We have evaluated the roll-off influence for theses different metals. For the first time we report the strong roll-off dependence with the deposited lanthanum thickness. Newly developed TiN, Al, La deposition processes have brought benefits for the CMOS 32/28nm technology
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Abram, Edward John. "Synthesis and characterisation of doped lanthanum gallate and lanthanum silicate oxide-ion conductors." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251374.

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Books on the topic "Lanthana"

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Harriet, Nilsson, and Dragomir Anca, eds. Biomedical applications of lanthanum. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Prasongsook, Charatsee. Lanthanum-modified lead titanate ceramics. Manchester: UMIST, 1996.

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Rangel, Maria do Carmo. The promoting effect of lanthanum in heterogeneous catalysts. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Rangel, Maria do Carmo. The promoting effect of lanthanum in heterogeneous catalysts. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Arandiyan, Hamidreza. Methane Combustion over Lanthanum-based Perovskite Mixed Oxides. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46991-0.

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Naidoo, Kistasamy Sathianandh. Nuclear magnetic resonance and relaxation in solid and liquid lanthanum. Konstanz: Hartung-Gorre, 1985.

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Guo, Xingye, Zhe Lu, Yeon-Gil Jung, and Jing Zhang. Novel Lanthanum Zirconate-based Thermal Barrier Coatings for Energy Applications. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58695-9.

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Wilkes, Mark Francis. A catalytic and solid state study of lanthanum doped ceria. [s.l.]: typescript, 1999.

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Ko stas Karyo take s. Ananke chre stote tos: Ena lanthanon keimeno koino nike s politike s. Athe na: Philippote, 1986.

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Furmann, Bogusław. Badanie poziomów elektronowych swobodnych atomów i jonów lantanu, prazeodymu i europu metodami spektroskopii laserowej / Bogusław Furman. Poznań: Wydawn. Poliechniki Poznańskiej, 2008.

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Book chapters on the topic "Lanthana"

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Mosaad, M. M., M. I. Abd El-Ati, S. A. Olofa, and A. Ismal. "Electrical Properties of BaTiO3 Doped with Lanthana and Niobia." In High-Performance Ceramics III, 357–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.357.

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Akitsu, Takashiro. "Lanthanum." In Encyclopedia of Metalloproteins, 1152. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-1533-6_200013.

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Chauvel, Catherine. "Lanthanum." In Encyclopedia of Earth Sciences Series, 799. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_114.

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Chauvel, Catherine. "Lanthanum." In Encyclopedia of Earth Sciences Series, 1–2. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_114-1.

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Cotton, S. A. "La Lanthanum." In Organometallic Compounds of the Lanthanides, Actinides and Early Transition Metals, 63–64. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-7164-7_13.

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Corbett, John D., and Arndt Simon. "Lanthanum Diiodide." In Inorganic Syntheses, 36–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132531.ch7.

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Corbett, John D., and Arndt Simon. "Lanthanum Diiodide." In Inorganic Syntheses, 17–19. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132616.ch4.

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Storms, E. K. "Lanthanum Carbides." In Inorganic Reactions and Methods, 307–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145265.ch112.

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Nagy, Zoltán. "La—Lanthanum." In Electrochemical Synthesis of Inorganic Compounds, 217. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_35.

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Macintyre, J. E., F. M. Daniel, D. J. Cardin, S. A. Cotton, R. J. Cross, A. G. Davies, R. S. Edmundson, et al. "La Lanthanum." In Dictionary of Organometallic Compounds, 100. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4966-3_29.

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Conference papers on the topic "Lanthana"

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Wong, Hei. "Lanthana and its interface with silicon." In 2014 IEEE 29th International Conference on Microelectronics (MIEL). IEEE, 2014. http://dx.doi.org/10.1109/miel.2014.6842082.

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Moothedan, Marymol, K. B. Sherly, P. Predeep, Mrinal Thakur, and M. K. Ravi Varma. "Synthesis and Characterisation of Nano Lanthana." In OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light. AIP, 2011. http://dx.doi.org/10.1063/1.3643606.

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Wei, G. C., M. R. Pascucci, E. A. Trickett, C. Brecher, and W. H. Rhodes. "Lanthana-Strengthened Yttria Domes And Windows." In 32nd Annual Technical Symposium, edited by Robert W. Schwartz. SPIE, 1989. http://dx.doi.org/10.1117/12.948119.

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Aruna, S. T., N. Balaji, and B. Arul Paligan. "A Comparative Study on the Synthesis and Properties of Yttria Stabilized Zirconia (YSZ) and Lanthana Doped YSZ Plasma Sprayed Thermal Barrier Coatings." In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3563.

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Ceramic thermal barrier coatings (TBCs) have been used for decades to extend the life of combustors and high temperature turbine stationary and rotating components to increase the operating temperature and in turn the performance of gas turbines or diesel engines can be increased. At present, thermal barrier coatings (TBCs) of Y2O3 partially stabilized ZrO2 (YSZ) films are widely used. In recent years ceramic compositions useful in thermal barrier coatings having reduced thermal conductivity are being explored to further increasing the operating temperature of gas turbines and improve the engine efficiency. In the present study, a comparison of the properties of state-of-the art 8wt% yttria stabilized zirconia (YSZ) and lanthana doped YSZ plasma sprayed coatings is presented. Plasma sprayable powders were prepared in the laboratory by a single step precipitation method and characterized. Both the powders had good flowability. These powders were plasma sprayed at identical critical plasma spray parameters. The coatings were characterized for phase, microstructure and thermal conductivity. Both the powders and coatings exhibited tetragonal form of zirconia and no traces of lanthana were observed. Both the coatings exhibited similar porosity levels. Microstructure of the coatings revealed porous coating with good adhesion of the bondcoat with the topcoat. Plasma sprayed 8wt% YSZ and lanthana doped YSZ exhibited thermal conductivity values of 0.88 and 0.67 W m−1 K−1 respectively which is lower than that reported in literature. This study shows that lanthana doping in YSZ helps in lowering the thermal conductivity and hence this coating may be a potential candidate for TBC application.
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Wei, George C., Arlene Hecker, and William H. Rhodes. "Scattering in lanthana-strengthened-yttria infrared transmitting material." In San Diego '92, edited by Paul Klocek. SPIE, 1992. http://dx.doi.org/10.1117/12.130782.

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Rhodes, W. H., G. C. Wei, and E. A. Trickett. "Lanthana-Doped Yttria: A New Infrared Window Material." In 30th Annual Technical Symposium, edited by Robert W. Schwartz. SPIE, 1986. http://dx.doi.org/10.1117/12.936410.

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Moothedan, Marymol, P. N. Sreedathan, Prasamsa S. Kumar, Akshaya Sivan, Devika Manoj, Nandana Shaji, A. S. Seethalakshmi, and Manju George. "Synthesis and characterization of lanthana/graphene oxide nanocomposite." In INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS: STAM 20. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0018167.

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Wei, G. C., C. Brecher, M. R. Pascucci, E. A. Trickett, and W. H. Rhodes. "Characterization Of Lanthana-Strengthened Yttria Infrared Transmitting Materials." In 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, edited by Solomon Musikant. SPIE, 1988. http://dx.doi.org/10.1117/12.945851.

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Tropf, William J., and Daniel C. Harris. "Mechanical, Thermal, And Optical Properties Of Yttria And Lanthana-Doped Yttria." In SPIE 1989 Technical Symposium on Aerospace Sensing, edited by Paul Klocek. SPIE, 1989. http://dx.doi.org/10.1117/12.960758.

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Wei, George C., Marina R. Pascucci, E. A. Trickett, S. Natansohn, and William H. Rhodes. "Enhancement in aerothermal shock survivability of lanthana-strengthened yttria windows and domes." In San Dieg - DL Tentative, edited by Paul Klocek. SPIE, 1990. http://dx.doi.org/10.1117/12.22479.

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Reports on the topic "Lanthana"

1

Paulik, S. W., and T. R. Armstrong. Mechanical properties of lanthanum and yttrium chromites. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/460182.

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Dummer, J. E., J. C. Taschner, and C. C. Courtright. The Bayo Canyon/radioactive lanthanum (RaLa) program. Office of Scientific and Technical Information (OSTI), April 1996. http://dx.doi.org/10.2172/233350.

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Gschneidner, K. A., F. A. Schmidt, A. E. Frerichs, and K. A. Ament. Phase I. Lanthanum-based Start Materials for Hydride Batteries. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1233432.

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Batishko, C. R., J. L. Brimhall, W. T. Pawlewicz, K. A. Stahl, and L. H. Toburen. Develop techniques for ion implantation of PLZT (lead-lanthanum-zirconate-titanate) for adaptive optics. Office of Scientific and Technical Information (OSTI), July 1987. http://dx.doi.org/10.2172/6046600.

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Gschneidner, Jr., Karl A., Frederick A. Schmidt, A. E. Frerichs, and Katherine A. Ament. CRADA (AL-C-2009-02) Final Report: Phase I. Lanthanum-based Start Materials for Hydride Batteries. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1127164.

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Yun, Sangho H., Judy Z. Wu, Steven C. Tidrow, and Donald W. Eckart. Growth of Hg-Based Cuprate Films on Lanthanum-Aluminate Using Fast-Temperature Ramping Hg-Vapor Annealing. Fort Belvoir, VA: Defense Technical Information Center, March 1997. http://dx.doi.org/10.21236/ada323736.

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Wolfenstine, Jeff. Intrinsic Creep Resistance of Two Solid Oxygen Fuel Cell Electrolytes: Cubic Zirconia Versus Doped Lanthanum Gallate. Fort Belvoir, VA: Defense Technical Information Center, March 1999. http://dx.doi.org/10.21236/ada362026.

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Taylor, R. The oxidative coupling of methane by lanthanum oxide catalysts: The influence of phase morphology on catalytic properties. Office of Scientific and Technical Information (OSTI), February 1990. http://dx.doi.org/10.2172/6971824.

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Simmons, C. M., D. L. Beshears, and M. R. Cates. Low-temperature phosphor thermometry: Calibration of europium-doped lanthanum oxysulfide between room temperature and minus 194 degrees C. Office of Scientific and Technical Information (OSTI), February 1990. http://dx.doi.org/10.2172/7157629.

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Singh, Prabhakar, Manoj Mahapatra, Rampi Ramprasad, Nguyen Minh, and Scott Misture. Study of the Durability of Doped Lanthanum Manganite and Cobaltite Cathode Materials under ''Real World'' Air Exposure Atmospheres. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1183564.

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