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Dissertations / Theses on the topic 'Production of zirconium'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Lundberg, Mikael. "Environmental analysis of zirconium alloy production." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-166178.

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The generation of electricity in light water nuclear power plants uses zirconium alloys as the primary containment and cladding of the nuclear fuel. The environmental impacts of the production of zirconium alloys have been analyzed form a lifecycle perspective. From the mining of the zirconium-bearing mineral zircon to the finished zirconium alloy tube. A qualitative study indentifying the production processes and their potential environmental impacts have been performed. A quantitative study to perform a lifecycle analysis of the zircon mining and mineral separation was carried out. The life

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2

Abdoulmoumine, Nourredine. "Sulfate and Hydroxide Supported on Zirconium Oxide Catalysts for Biodiesel Production." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33873.

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Biodiesel is currently produced by homogeneous catalysis. More recently however, heterogeneous catalysis is being considered as a cheaper alternative to the homogeneous process. In this research project, heterogeneous catalysts of zirconium oxide were produced by impregnation. Zirconium oxide impregnation with sulfuric acid produced acidic solid catalysts. It was determined that impregnation and calcination at 550<sup>o</sup>C (SO<sub>4</sub>/ZrO<sub>2</sub>-550<sup>o</sup>C) produced the best catalyst for palmitic acid esterification with 10 wt % as the optimum concentration in esterificatio

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3

Zhang, Yue, and 张悦. "Synthesis and characterization of zirconia based solid acid catalysts for biodiesel production." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49858828.

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Biodiesel is a promising renewable alternative fuel to fossil energy. For the biodiesel production from low-cost feedstock, a pretreatment step is essential, which is the esterification of free fatty acids (e.g. oleic acid) in the feedstock in order to avoid soap formation and minimize catalyst deactivation. Sulfuric acid modified zirconia (H2SO4-ZrO2) is known as an effective heterogeneous catalyst for esterification. However, due to rapid 〖SO〗_4^(2-) leaching, its reusability is low and its practical use is thus largely hindered. Zirconia supported on silica (ZrO2-SiO2) serves as a kind

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4

Ozerciyes, Berker. "A Novel Precursor For Synthesis Of Zirconium Tungstate And Preliminary Studies For Nanofiber Production." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610383/index.pdf.

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Zirconium tungstate (ZrW2O8) is a ceramic that shows large isotropic negative thermal expansion over a wide range of temperature. This unique property makes it an interesting candidate for applications where thermal expansion mismatch between components constitutes a problem. ZrW2O8 is typically produced by solid-state reaction between zirconium oxide and tungsten oxide at 1200oC. In some studies, ZrW2O8 precursors have been produced from relatively expensive zirconium and tungsten sources. While the origin of negative thermal expansion has been the main focus in the majority of publications,

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5

Parkison, Adam Joseph. "Hydride production in zircaloy-4 as a function of time and temperature." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2788.

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6

SCHACH, TIGREAT DELPHINE. "Etude analytique du comportement des tetrachlorures de zirconium et de hafnium dans les melanges a1c13-kc1-mgc12 (0 a 9 mol%). Application a la production de zirconium dehafnie." Paris 6, 1999. http://www.theses.fr/1999PA066691.

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La separation du zirconium et du hafnium est une etape essentielle pour la production de zirconium a usage nucleaire. Le procede actuel repose sur une distillation en bain de sels qui permet d'extraire le hafnium, le zirconium demeurant en solution dans le bain. Pour mieux comprendre les mecanismes mis en jeu nous avons etudie d'une part les proprietes du solvant actuel, a savoir un melange de chlorure d'aluminium et de chlorure de potassium, et les proprietes acido-basiques du zirconium et du hafnium dans ce solvant d'autre part. En vue d'ameliorer le procede actuel, nous avons etudie l'influ

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7

Bespalko, Nicolas. "Préparation de nouveaux catalyseurs à base d'oxydes mixtes de lanthane et zirconium et application au réformage d'éthanol pour la production d'hydrogène." Strasbourg, 2011. http://www.theses.fr/2011STRA6129.

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Cette thèse se base sur le vaporéformage catalytique de l'éthanol pour la production d'hydrogène. Les catalyseurs employés sont des systèmes à base de métaux nobles ou métaux de transition, en présences de cations dopants et de supports oxydes dont on peut modifier les propriétés redox et acido-basiques. Dans une première étape, divers oxydes mixtes Ni-La-Zr et Co-la-Zr ont été synthétisés par différentes techniques de préparation et caractérisés par diverses techniques physico-chimiques de volume et de surface. Dans un second temps, des catalyseurs dopés à 1 % de rhodium (Rh-Ni-La-Zr et Rh-Co

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8

Smith, Sarah E. "Preventing Biofilm Formation on Indwelling Medical Devices and the Effects of Growth Condition on Biofilm Formation and Endotoxin Production with Zirconium Alloys." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1281066825.

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9

Gardner, Adam R. "Molecular dynamics of aot/water/isooctane reverse micelles dynamic and structural analysis and effect of zirconium ions on the micelles structure for ZrO2 nanoparticle production /." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442844.

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10

Liu, Xiu. "Production d'hydrogène par reformage à sec de méthane sur catalyseurs au Ni à base de CeO2, CeO2 modifiée avec Zr ou Al, et nano-matériaux Mg-Al-O." Electronic Thesis or Diss., Centrale Lille Institut, 2021. http://www.theses.fr/2021CLIL0032.

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La demande en hydrogène, en tant que produit chimique et énergie, augmente, mais les principales méthodes de production d'hydrogène ne sont ni durables ni respectueuses de l'environnement. La production d'hydrogène à partir de ressources renouvelables (comme le biogaz composé principalement de CH4 et de CO2) est requise. Le reformage à sec du méthane (DRM) est une méthode prometteuse pour produire H2 et CO à partir des gaz. Dans cette thèse, des catalyseurs à base de Ni, CeNiXOY, CeZr0.5NiXOY, CeAl0.5NiXOY, et AlMg2NiXOY sont étudiés pour la réaction de reformage à sec du méthane. L'effet de l

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11

BERGAMASCHI, VANDERLEI S. "Preparação e caracterização de catalisadores de metais de transição suportados em zircônia. Uso na reforma a vapor do etanol para obtenção de hidrogênio." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11359.

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12

SILVA, NESTOR C. da. "Estudo e otimizacao das condicoes de preparo do gel de molibdato de zirconio usado nos geradores de sup(99) Mo - sup(99m) Tc." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10966.

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13

Аверкова, Ольга Євгенівна, Ольга Евгеньевна Аверкова, Olha Yevhenivna Averkova, В. В. Ивашина, М. А. Кунпан та Я. А. Наземцева. "Изучение экологических аспектов производства циркония на СМНПО им.Фрунзе г.Сумы". Thesis, Издательство СумГУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/6765.

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14

Haurais, Florian. "Evaluate the contribution of the fuel cladding oxidation process on the hydrogen production from the reflooding during a potential severe accident in a nuclear reactor." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS375/document.

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En centrales nucléaires, un accident grave est une séquence très peu probable d’événements durant laquelle des composants du réacteur sont significativement endommagés, par interactions chimiques et/ou fusion, à cause de très hautes températures. Cela peut mener à des rejets radiotoxiques dans l’enceinte et à une entrée d’air dans le réacteur. Dans ce contexte, ce travail de thèse mené chez EDF R&D visait à modéliser la détérioration du gainage combustible, en alliages de zirconium, en conditions accidentelles : haute température et soit vapeur soit mélange air-vapeur. L’objectif final éta

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15

Tapia, Reche Mariano. "Bifunctional niobia and zirconia catalysts for 5-hydroxymethylfurfural production from C6 sugars." Thesis, Aston University, 2017. http://publications.aston.ac.uk/33426/.

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Biomass represents one of the most practical and environmentally friendly options available as an alternative to petroleum derived compounds. Amongst them, 5-hydroxymethylfurfural (HMF) stands as a potential platform chemical for the production of biofuels and other value added chemicals. Although HMF can be selectively produced from mono- and poly-saccharides with the assistance of organic solvents or ionic liquids, its formation in aqueous media under mild conditions remains a challenge due to undesired side reactions. In this thesis, the conversion of glucose and fructose to HMF has been st

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16

Gromov, Nikolay. "Transformation catalytique de la cellulose en milieu aqueux pour la production de molécules plateformes." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0156/document.

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Ce projet de thèse a concerné la recherche et le développement de catalyseurs multifonctionnels efficaces et de procédés catalytiques en une étape (hydrolyse-déshydratation, hydrolyse-oxydation) pour la transformation de la cellulose en produits chimiques à valeur ajoutée (glucose, 5-HMF, acide formique). Ces produits sont également connus sous le nom de molécules plateformes et ils présentent un intérêt dans une large gamme d'applications, par exemple, pour les industries alimentaires et chimiques et pour la production de carburants. Dans ce projet, des recherches systématiques sur la synthès

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17

Oliver, Tomás Borja. "Transformación de biomasa a productos químicos de interés y carburantes mediante descarboxilación cetónica e hidrodesoxigenación." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90411.

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The purpose of the present thesis was the use and valorisation of biomass platform molecules or their derivatives, applying the principles of sustainable chemistry. The reaction of ketonic decarboxylation of carboxylic acids was studied in the presence of metal oxides. ZrO2 was shown to be an excellent catalyst for the reaction, reasonably stable with time on stream and reusable. The reactivity of different substrates over ZrO2 was investigated with respect to the degree of substitution of the carbon in alpha position. 2-methylbutanoic acid, with one methyl replacing one of the alpha H atoms a

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18

Mailley, Sophie. "Caractérisation électrochimique de nouveaux matériaux d'électrode Bi2Ru2O7 et Bi3Ru3O11 : application aux capteurs potentiométriques à oxygène fonctionnant à basses températures." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0159.

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Ce travail a ete consacre a la caracterisation electrochimique de nouveaux materiaux d'electrode susceptibles d'etre utilises dans des capteurs potentiometriques a oxygene mettant en uvre la zircone stabilisees les oxydes bi2ru207 et bi3ru3011 ont ete etudies. Les eleectrodes ont ete realisees soit par depot de peinture synthetisee a partir de poudre des oxydes soit a l'aide de la technique pyrosol. La reaction d'electrode a ete etudiee a l'aide de techniques de caracterisation (diffraction des rayons x et microscopie electronique a balayage) et de mesures potentiometriques, par spectroscopie

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19

Garnetti, David J. "Uranium Powder Production Via Hydride Formation and Alpha Phase Sintering of Uranium and Uranium-zirconium Alloys for Advanced Nuclear Fuel Applications." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7382.

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The research in this thesis covers the design and implementation of a depleted uranium (DU) powder production system and the initial results of a DU-Zr-Mg alloy alpha phase sintering experiment where the Mg is a surrogate for Pu and Am. The powder production system utilized the uranium hydrogen interaction in order to break down larger pieces of uranium into fine powder. After several iterations, a successful reusable system was built. The nominal size of the powder product was on the order of 1 to 3 mm. The resulting uranium powder was pressed into pellets of various compositions (DU, DU-10Zr

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20

Villalon, Jr Thomas Anthony. "Zero-direct emission silicon production via solid oxide membrane electrolysis." Thesis, 2018. https://hdl.handle.net/2144/30729.

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Currently, industrial processes that produce silicon occur in batch units which are energy intensive, capital intensive, and emit harmful pollutants into the atmosphere. A new technology, solid oxide membrane (SOM) processing, seeks to produce silicon without direct emissions and with lower energy and capital costs. Previous studies have shown that this technology can produce silicon; however, the proof-of- concept cell was incapable of producing large volumes of silicon due to restrictions in the molten salt. Current research has engineered an oxyfluoride molten salt to be more effici

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21

Kao, Chu-Yun, and 高楚昀. "Preparation of Copper-Zirconia Catalyst Supported on Dysprosium-Aluminum Mixed Oxides for Hydrogen Production by Methanol Steam Reforming." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/04977087531667577559.

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碩士<br>國立中興大學<br>化學工程學系所<br>99<br>In this dissertation, the purpose of this study is to prepare copper -zirconia catalyst supported on dysprosium-aluminum mixed oxides and to apply it on steam reforming of methanol. The catalysts were tested by packed-bed reactor between 200℃ to 400℃. The parameters of catalyst preparation include the different deposition methods and calcination temperature, ratios of promoter and copper to support, different solvents, concentration of precursor solution, types of reductant and dispersant, ratios of dysprosium-aluminum mixed oxides. Operating conditions in stea

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22

Su, Shizhao. "Zero-direct-carbon-emission aluminum production by solid oxide membrane-based electrolysis process." Thesis, 2016. https://hdl.handle.net/2144/17080.

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The traditional aluminum production process (Hall-Héroult process) involves electrolyzing the alumina dissolved in the molten cryolite salt. This process is energy intensive and emits massive amounts of CO2 and other greenhouse gases. The market demand of aluminum and the environmental impact of the current aluminum production process justify research and development of alternative electrolytic processes for aluminum production that can both reduce the cost and eliminate adverse environment impacts. Solid oxide membrane (SOM) based electrolysis process is an innovative technology that has bee

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23

Bastos, Luís Diogo dos Santos. "Metal oxide nanoparticle formation through detonation - modeling evaluation." Master's thesis, 2015. http://hdl.handle.net/10316/38997.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>The production of ceramics nanoparticles by detonation of metalized emulsions is an important alternative to the traditional metallurgic methods. The small size of the obtained particles (high pressure reaction), the reliability of reaction process (detonation), high temperature post-detonation particles formation with extremely fast cooling (due to the speed of adiabatic expansion of the gases), and the control of product condensed phase composition are

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