Academic literature on the topic 'MIL-101'
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Journal articles on the topic "MIL-101"
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Yin, Yu, Junpeng Shao, Lin Zhang, Qun Cui, and Haiyan Wang. "Experimental Study on Heat Transfer and Adsorption Cooling Performance of MIL-101/Few Layer Graphene Composite." Energies 14, no. 16 (August 13, 2021): 4970. http://dx.doi.org/10.3390/en14164970.
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MIL-101 is a promising metal-organic frameworks (MOFs) material in adsorption chiller application due to its high adsorption capacity for water and excellent adsorption/desorption cyclic stability. Few layer graphene (FLG) as the thermal conductive additive was added into MIL-101 to improve inferior heat transfer of MIL-101 in the adsorption cooling process. The heat transfer characteristic of MIL-101/FLG adsorber and the adsorption cooling performance of the MIL-101/FLG-water working pair were studied. Results show that thermal conductivity of MIL-101/20%FLG composite is 5.79-6.54 times that of MIL-101. Adding FLG is conducive to the formation of heat transfer channels in MIL-101/FLG adsorber and the rapid removal of adsorption heat. The heating and cooling rate of MIL-101/FLG adsorber is ~2.2 times that of MIL-101 adsorber. Under typical adsorption water chiller conditions, the specific cooling power (SCP) and coefficient of performance (COP) of the MIL-101/FLG-water working pair is 72.2–81.0 W kg−1 and 0.187–0.202, respectively, at desorption temperatures of 70 °C and 90 °C, which is 1.43–1.56 times higher than the MIL-101-water working pair. The excellent structural and adsorption/desorption cyclic stability of MIL-101/FLG composite is verified after 50 consecutive cycles. It can provide a promising adsorbent candidate (MIL-101/FLG composite) in adsorption water chiller process.
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Liu, Zhongbao, Jiayang Gao, Xin Qi, Zhi Zhao, and Han Sun. "Experimental Study on Activated Carbon-MIL-101(Cr) Composites for Ethanol Vapor Adsorption." Materials 14, no. 14 (July 8, 2021): 3811. http://dx.doi.org/10.3390/ma14143811.
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In this study, the hydrothermal method was used to synthesize MIL-101(Cr), and activated carbon (AC) with different content was incorporated in to MIL-101(Cr), thereby obtaining AC-MIL-101(Cr) composite material with a huge specific surface area. The physical properties of MIL-101(Cr) and AC-MIL-101(Cr) were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), nitrogen adsorption and desorption and specific surface area testing, and ethanol vapor adsorption performance testing. The results show that with the increase of activated carbon content, the thermal stability of AC-MIL-101(Cr) is improved. Compared with the pure sample, the BET specific surface area and pore volume of AC-MIL-101(Cr) have increased; In the relative pressure range of 0–0.4, the saturated adsorption capacity of AC-MIL-101(Cr) to ethanol vapor decreases slightly. It is lower than MIL-101(Cr), but its adsorption rate is improved. Therefore, AC-MIL-101(Cr)/ethanol vapor has a good application prospect in adsorption refrigeration systems. The exploration of AC-MIL-101(Cr) composite materials in this paper provides a reference for the future application of carbon-based/MOFS composite adsorbent/ethanol vapor working fluid in adsorption refrigeration.
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Zhao, Wenpu, Weiqiu Huang, Manlin Li, and Zhoulan Huang. "Adsorption, Kinetic and Regeneration Studies of n-Hexane on MIL-101(Cr)/AC." Nano 14, no. 08 (August 2019): 1950100. http://dx.doi.org/10.1142/s1793292019501005.
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MIL-101(Cr)/AC was synthesized by in situ incorporation of activated carbon powder via hydrothermal method. The water stability, n-hexane adsorption and regeneration of the MIL-101(Cr)/AC were experimentally measured. The results showed that the MIL-101(Cr)/AC exhibited the larger surface area (3319.3[Formula: see text]m2/g) than that of MIL-101(Cr) and AC, respectively. The addition of activated carbon was beneficial to improve the yield of MIL-101(Cr)/AC. The pore structure parameter and XRD of the MIL-101(Cr)/AC changed little after in water for 24[Formula: see text]h. Furthermore, the adsorption capacity of MIL-101(Cr)/AC for n-hexane was 786[Formula: see text]mg/g, which increased to 23.0% and 27.7% compared with MIL-101(Cr) and AC, respectively. Kinetic fitting of data indicated that the pseudo-first order model can more accurately describe the adsorption process of n-hexane on MIL-101(Cr)/AC and the intraparticle diffusion was not the sole rate-controlling step. Besides, the regeneration efficiency of MIL-101(Cr)/AC was over 92% after 10 consecutive n-hexane adsorption/desorption cycles.
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Liu, Xin, and Yan Ying Zhao. "Adsorption Kinetics of Methylene Blue on Synthesized DMF-MIL-101(Cr), a DMF-Functionalized Metal-Organic Framework." Key Engineering Materials 671 (November 2015): 419–24. http://dx.doi.org/10.4028/www.scientific.net/kem.671.419.
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An N, N-dimethylformamide (DMF)-functionalized metal–organic framework, namely, DMF-MIL-101(Cr), was prepared and then used for the adsorptive removal of methylene blue (MB), a cationic dye, from aqueous solutions. MIL-101(Cr) was synthesized by the hydrothermal method. Next, by dipping the MIL-101(Cr) sample in DMF, DMF-MIL-101(Cr) was synthesized. The results of X-ray diffraction analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis confirmed that DMF and MIL-101 could be combined successfully. More importantly, the MB uptake capacity of DMF-MIL-101(Cr) was significantly higher than that of MIL-101(Cr). Unlike MIL-101(Cr), DMF-MIL-101(Cr) could adsorb the entire MB in a solution with a concentration of 10.92 mg/L, owing to the electrostatic interactions between DMF and the MB molecules. In 100 mL of a 10.92-mg/L MB solution, DMF-MIL-101(Cr) can reach a state of absorbance equilibrium within10 min. After that, the adsorption process exhibited the characteristics of a zero-order reaction. This result indicates that it may be possible to exploit different functionalization methods and improve the rate of adsorption of dyes onto metal–organic frameworks.
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Henschel, Antje, Kristina Gedrich, Ralph Kraehnert, and Stefan Kaskel. "Catalytic properties of MIL-101." Chemical Communications, no. 35 (2008): 4192. http://dx.doi.org/10.1039/b718371b.
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Liu, Yana, Lu Fan, Chen Xu, Keke Sun, Zhennan Shi, and Ling Li. "MIL-101/CDs/MIL-101 for potential fluorescence imaging and pH-responsive drug delivery." Materials Letters 211 (January 2018): 32–35. http://dx.doi.org/10.1016/j.matlet.2017.09.073.
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Guo, Huaisu, Weilin Guo, Yang Liu, and Xiaohua Ren. "Quinone-modified metal-organic frameworks MIL-101(Fe) as heterogeneous catalysts of persulfate activation for degradation of aqueous organic pollutants." Water Science and Technology 79, no. 12 (June 15, 2019): 2357–65. http://dx.doi.org/10.2166/wst.2019.239.
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Abstract In this work, quinone-modified metal-organic framework MIL-101(Fe)(Q-MIL-101(Fe)), as a novel heterogeneous Fenton-like catalyst, was synthesized for the activation of persulfate (PS) to remove bisphenol A (BPA). The synthetic Q-MIL-101(Fe) was characterized via X-ray diffraction, scanning electron microscope, Fourier transform infrared, electrochemical impedance spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy. As compared to the pure MIL-101(Fe), Q-MIL-101(Fe) displayed better catalytic activity and reusability. The results manifested that the Q-MIL-101(Fe) kept quinone units, which successfully promoted the redox cycling of Fe3+/Fe2+ and enhanced the removal efficiency. In addition, the reaction factors of Q-MIL-101(Fe) were studied (e.g. pH, catalyst dosage, PS concentration and temperature), showing that the optimum conditions were [catalyst] = 0.2 g/L, [BPA] = 60 mg/L, [PS] = 4 mmol/L, pH = 6.79, temperature = 25 °C. On the basis of these findings, the probable mechanism on the heterogeneous activation of PS by Q-MIL-101(Fe) was proposed.
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Yang, Shipeng, Siwei Peng, Chunhui Zhang, Xuwen He, and Yaqi Cai. "Synthesis of CdxZn1−xS@MIL-101(Cr) Composite Catalysts for the Photodegradation of Methylene Blue." Nano 13, no. 10 (October 2018): 1850118. http://dx.doi.org/10.1142/s1793292018501187.
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Nanoparticles of the semiconductor catalyst CdxZn[Formula: see text]S were embedded into the metal organic framework MIL-101(Cr) to obtain CdxZn[Formula: see text]S@MIL-101(Cr) nanocomposites. These materials not only possess high surface areas and mesopores but also show good utilization of light energy. The ultraviolet-visible diffuse reflectance patterns of CdxZn[Formula: see text]S@MIL-101(Cr) nanocomposites showed that Cd[Formula: see text]Zn[Formula: see text]S@MIL-101(Cr) possessed good visible light response ability among the synthesized nanocomposites. The photocatalytic performance of the CdxZn[Formula: see text]S@MIL-101(Cr) nanocomposites were tested via degradation and mineralization of methylene blue in neutral water solution under light irradiation using a 300W xenon lamp. As a result, using Cd[Formula: see text]Zn[Formula: see text]S@MIL-101(Cr) as a catalyst, 99.2% of methylene blue was mineralized within 30[Formula: see text]min. Due to the synergistic effect of adsorption by the MIL-101(Cr) component and photocatalytic degradation provided by the Cd[Formula: see text]Zn[Formula: see text]S component, the Cd[Formula: see text]Zn[Formula: see text]S@MIL-101(Cr) catalyst displayed superior photocatalytic performance relative to Cd[Formula: see text]Zn[Formula: see text]S and MIL-101(Cr). Furthermore, Cd[Formula: see text]Zn[Formula: see text]S@MIL-101(Cr) possessed excellent stability during photodegradation and exhibited good reusability. The remarkable photocatalytic performance of Cd[Formula: see text]Zn[Formula: see text]S@MIL-101(Cr) is likely due to the effective transfer of electrons and holes at the heterojunction interfaces.
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Li, Ling, Zhennan Shi, Hongyang Zhu, Wei Hong, Fengwei Xie, and Keke Sun. "Adsorption of azo dyes from aqueous solution by the hybrid MOFs/GO." Water Science and Technology 73, no. 7 (January 6, 2016): 1728–37. http://dx.doi.org/10.2166/wst.2016.009.
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In this work, a hybrid of chromium(III) terephthalate metal organic framework (MIL-101) and graphene oxide (GO) was synthesized and its performance in the removal of azo dyes (Amaranth, Sunset Yellow, and Carmine) from water was evaluated. The adsorption for azo dyes on MIL-101/GO was compared with that of MIL-101, and it was found that the addition of GO enhanced the stability of MIL-101 in water and increased the adsorption capacity. The maximum adsorption capacities of MIL-101/GO were 111.01 mg g−1 for Amaranth, 81.28 mg g−1 for Sunset Yellow, and 77.61 mg g−1 for Carmine. The adsorption isotherms and kinetics were investigated, showing that the adsorption fits the Freundlich isotherm and the pseudo-second-order kinetic model. The recyclability of MIL-101/GO was shown by the regeneration by acetone. The high adsorption capability and excellent reusability make MIL-101/GO a competent adsorbent for the removal dyes from aqueous solution.
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Zheng, Yue, Fuchen Chu, Bing Zhang, Jun Yan, and Yunlin Chen. "Ultrahigh adsorption capacities of carbon tetrachloride on MIL-101 and MIL-101/graphene oxide composites." Microporous and Mesoporous Materials 263 (June 2018): 71–76. http://dx.doi.org/10.1016/j.micromeso.2017.12.007.
Full textDissertations / Theses on the topic "MIL-101"
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Ferreira, Ricardo Barroso 1988. "Síntese, caracterização e funcionalização superficial de redes metalorgânicas análogas ao MIL-101." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248552.
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Orientador: André Luiz Barboza FormigaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
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Resumo: O trabalho apresentado explora a modificaçãoo do processo de síntese de uma rede metalorgânica conhecida como MIL-101(Cr), um material formado por clusters trinucleares de crômio(III) unidos por ligantes tereftalato em ponte. A partir do uso de meios reacionais contendo uma mistura de componentes (ligantes ou metais), visou-se a incorporação de diferentes componentes em materiais contendo a mesma estrutura do MIL-101(Cr). Os produtos formados por esta estratégia foram analisados por difração de raios X pelo método de pó, onde se observou que, dependendo da composição do meio reacional, materiais contendo a mesma estrutura do MIL-101(Cr) foram formados. Evidências da incorporação dos diferentes componentes na estrutura dos materiais foram conseguidas pelo uso das espectroscopias nas regiões do infravermelho e ultravioleta e visível. Para os materiais contendo diferentes ligantes, observou-se um grau de incorporação de um dos ligantes substituídos de até aproximadamente 20%, apresentando áreas superficiais da ordem de 2300 mg. Já, para os materiais contendo diferentes metais, obteve-se uma incorporação de Fe(III) de até 17%. Além do mais, neste caso, alguns resultados mostram que há uma homogeneidade da distribuição de ferro nestes materiais. Desta forma, a partir do desenvolvimento deste trabalho, mostrou-se que o método de síntese utilizado foi bastante simples e eficiente para a produção de novos materiais que apresentam a estrutura do MIL-101, mas com superfícies com características e reatividade diferenciadas.
Abstract: This study explores modifications in the process of synthesis of a metal-organic framework known as MIL-101(Cr), formed by chromium(III) trinuclear clusters linked by terephthalate bridges. Through the use of reaction media containing a mixture of components (linkers or metals), we aimed the incorporation of different components in materials presenting MIL-101(Cr) structure. The products obtained from this approach were characterized by powder X-ray diffraction, where we could observe that materials isoreticular to MIL-101(Cr) were formed, depending on the composition of reaction medium. From infrared and ultraviolet and visible spectroscopies, the incorporation of the different components in the structures was confirmed. For the materials containing different linkers, we observed incorporation degrees up to 20% for one of the substituted linkers and these materials presented specific surface areas in the order of 2300 mg. For the systems containing different metals, we obtained incorporation degrees up to 17%. Moreover, some results show that iron centers are homogeneously distributed over the structures. In conclusion, we could show that this synthetic approach was very simple and efficient for the formation of novel materials that are isoreticular to MIL-101(Cr), but presenting surfaces with diverse characteristics and reactivity.
Mestrado
Quimica Inorganica
Mestre em Química
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Oliveira, Aline de. "Mecanismo de cianossililação de aldeídos catalisada pela MOF MIL-101(Cr)." Universidade Federal de Minas Gerais, 2015. http://hdl.handle.net/1843/SFSA-9V6QVK.
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The Metal-Organic Framework (MOF) MIL-101(Cr) has been reported as a good catalyst for cyanosilylation reactions. This process constitutes an important step in the preparation of compounds like -aminoalcohols, -hydroxyacids, -hydroxyketons and -aminoacids, which are very useful in the synthesis of pharmaceuticals and agrochemicals. MIL-101(Cr) is a highly porous solid, with large pores and, therefore, it can be used as heterogeneous catalyst in processes which involve bulky substances, such as the molecules of biological interest. Understanding at the molecular level the performance of this MOF as a catalyst in cyanosilylation of aldehydes is extremely important, because it would allow the identification of the characteristics of this material that make the catalysis possible. Thus, the obtained information could help the design of new MOFs that are more efficient or, different ways to optimize the catalytic activity of MIL-101(Cr). In this work, the catalytic properties of this material are investigated for the cyanosilylation reaction of aldehydes through DFT calculations. Whence, mechanisms of aldehydes conversion in their respective trimethylsilylated cyanohydrins were performed, through the addition of trimethylsilyl cyanide. Five catalyzed mechanisms were studied using models of metallic clusters to describe the catalytic site of MIL-101(Cr) and three non-catalyzed mechanisms were also analyzed, in order to be compared to the catalyzed processes. The results indicate that both, the catalyzed and the non-catalyzed mechanism, occur through concerted processes, in which there is formation of a transition state with a five-membered cycle. Furthermore, the catalytic performance of MIL-101(Cr) probably occurs due to the presence of Lewis acidic sites, which come from coordinatively unsaturated chromium(III) ions in regions of crystal defects, located in the material structure, or in its surface. Thereby, one way of enhancing the catalytic properties of MIL-101(Cr) would be through their preparation by synthetic routes that lead to defects in this solid structure.A Metal-Organic Framework (MOF) MIL-101(Cr) foi reportada como um bom catalisador para a reação de cianossililação de aldeídos. Esse processo constitui uma etapa importante na preparação de compostos como ß-aminoálcoois, a-hidroxiácidos, a-hidroxi-cetonas e a-aminoácidos, os quais são muito utilizados na preparação de fármacos e agroquímicos. A MIL-101(Cr) é um sólido altamente poroso, de poros largos e, portanto, pode ser utilizada como catalisador heterogêneo em processos que envolvam substâncias volumosas, tais como as moléculas de interesse biológico. O entendimento ao nível molecular da atuação dessa MOF como catalisador na cianossililação de aldeídos é de extrema relevância, pois permitirá a identificação das características desse material que tornam a catálise possível. Assim, as informações obtidas poderão auxiliar na proposta de novas MOFs, mais eficientes ou, de maneiras para otimização do desempenho catalítico da MIL-101(Cr). Por isso, nesta dissertação, a propriedade catalítica desse material é investigada para a reação de cianossililação de aldeídos, utilizando-se a DFT. Assim, foram realizados estudos de mecanismos de conversão de aldeídos em suas respectivas cianoidrinas trimetil-sililadas, através da adição de cianeto de trimetil-silano. Foram estudados cinco mecanismos catalisados, utilizando-se modelos de aglomerados metálicos para a descrição do sítio catalítico da MIL-101(Cr), e três mecanismos não catalisados, com o objetivo de serem comparados aos processos catalisados. Os resultados indicam que ambos os mecanismos, catalisado e não catalisado, ocorrem preferencialmente através de processos concertados, nos quais há formação de um estado de transição que apresenta um ciclo de cinco membros. Além disso, o desempenho catalítico da MIL-101(Cr) deve-se, provavelmente, aos sítios ácidos de Lewis, que ocorrem devido à presença de íons de cromo(III) coordenativamente insaturados, localizados em regiões de defeitos da estrutura cristalina do material, ou em sua superfície. Dessa forma, uma maneira de potencializar as propriedades catalíticas da MIL-101(Cr) é através de sua preparação por rotas sintéticas que conduzam à defeitos na estrutura desse sólido.
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Wittmann, Thomas [Verfasser], and Jürgen [Akademischer Betreuer] Senker. "Selektive Wirt-Gast Wechselwirkungen in der Metall-organischen Gerüstverbindung MIL-101 / Thomas Wittmann ; Betreuer: Jürgen Senker." Bayreuth : Universität Bayreuth, 2018. http://d-nb.info/117324798X/34.
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Bernt, Stephan [Verfasser]. "Funktionalisierung und Modifizierung anorganisch-organischer Hybridverbindungen auf Basis von ZIF-8 und Cr-MIL-101 / Stephan Bernt." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1053683014/34.
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Judd, Katherine Elizabeth. "101 mil brasileiros no mundo : as implicações do Programa Ciência Sem Fronteiras para o Estado Desenvolvimentista Brasileiro." reponame:Repositório Institucional da UnB, 2014. http://repositorio.unb.br/handle/10482/15453.
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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Sociais, Centro de Pesquisa e Pós-Graduação Sobre as Américas, Programa de Pós-Graduação em Estudos Sobre as Américas, 2014.Submitted by Albânia Cézar de Melo (albania@bce.unb.br) on 2014-04-15T14:50:09Z No. of bitstreams: 1 2014_KatherineElizabethJudd.pdf: 1301921 bytes, checksum: 641e4dbee8fbb71701dbf83c731e09f3 (MD5)
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O tema do Estado desenvolvimentista tem sido estudado e discutido desde o início do século XX. Quais são suas propriedades? Qual é o papel do Estado no desenvolvimento científico-tecnológico de um país e quais são os fatores que tornam um Estado um desenvolvimentista? É neste corpo de literatura que o presente trabalho pretende se inserir. Especificamente, o trabalho apresenta uma parte da literatura mais recente sobre o Estado desenvolvimentista, investigando os fatores novos que o configuram no século XXI. Após uma discussão sobre modelos de Estados desenvolvimentista (na Ásia, Europa, Estados Unidos e Brasil), o caso do programa brasileiro Ciência sem Fronteiras (CSF) é estudado para verificar se é uma demonstração de um novo rumo de Estado Desenvolvimentista em Rede do Estado brasileiro. Para verificar isso, foram realizadas oito entrevistas com atores envolvidos com o programa. Ao sintetizar os resultados das entrevistas, a autora conclui que o programa parece mais com um Estado Desenvolvimentista Burocrático (DBS) e postula novas hipóteses a partir das entrevistas realizadas.
The Developmental State, a term which refers to state-led development with regards to the economy as well as scientific and technological sectors, has been studied and debated by social scientists since the beginning of the 20th century. Specifically, the discussion centers on questions such as: what are its properties? What is the role of the government in fostering innovation in science and technology in a particular country, and what are the factors that turn a state into a Developmental State? This thesis aims to insert itself within this body of literature, asking new questions about the role of the Developmental State in Brazil. Specifically, the thesis studies a portion of the more recent literature on the developmental state, investigating the new factors that contribute to a developmental state in the 21st century. After a theoretical discussion on different models of developmental states (in Korea and Japan, Germany and Sweden, the United States, and Brazil), an empirical study on the Brazilian Science without Borders policy is carried out, seeking to verify whether it is a demonstration of a new Developmental Network State (DNS) model in Brazil. Eight semi-structured interviews were carried out with key actors involved in the formulation and execution stages of Science without Borders. The thesis concludes that the program most resembles an extension of the current Brazilian developmental model, the Developmental Bureaucratic State (DBS), and postulates new hypotheses that could be tested in the future, on the basis of the interview results.
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Yu, Zhewei. "Equilibrium and kinetics studies of hydrogen storage onto hybrid activated carbon-metal organic framework adsorbents produced by mild syntheses." Thesis, Nantes, Ecole des Mines, 2016. http://www.theses.fr/2016EMNA0236/document.
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Depuis une quinzaine d’années, les matériaux poreux de type Metal Organic Frameworks (MOFs) offrent de nouvelles perspectives dans le cadre du stockage d’hydrogène par adsorption. Ces matériaux possèdent une structure et un réseau de pores particulièrement bien adaptés à l’adsorption des gaz. Ainsi, le téréphtalate de Chrome (III) (MIL-101(Cr)), composé chimiquement très stable, possède une grande capacité de stockage de l’hydrogène, du dioxyde de carbone et du méthane. Afin de renforcer sa capacité de stockage d’hydrogène, un dopage au charbon actif (AC) du matériau a été envisagé. Les synthèses des matériaux dopés et non-dopés ont été réalisées et, pour cela, différents agents minéralisants (acide fluorhydrique, acide acétique et acétate de sodium) ont été testés. Les matériaux synthétisés furent caractérisés par diffraction des rayons X (DRX), par microscopie électronique à balayage (MEB), par analyses thermogravimétriques (ATG) et par adsorption d’azote à 77K. Les capacités de stockage d’hydrogène de ces matériaux à 77 K et 100 bar ont été évaluées par mesures des isothermes d’adsorption d’hydrogène, réalisées par méthodes volumétrique et gravimétrique. Les résultats obtenus par ces deux méthodes sont en parfait accord et le matériau composite affiche une capacité d’adsorption de 13.5 wt%, qui est supérieure à celle du matériau non dopé (8.2 wt% dans les même conditions expérimentales). Les cinétiques d’adsorption ont été mesurées à 77 K par méthode volumétrique. Les résultats obtenus ont été comparés au modèle de la force motrice linéaire, Linear Driving Force (LDF). Un modèle de diffusion dépendant de la température a été développé afin de tenir compte des variations de températures qui se produisent durant le processus d’adsorptionSince the last 15 years, the porous solids such as Metal-Organic Frameworks (MOFs) have opened new perspectives for the development of adsorbents for hydrogen storage. The structure and the pore networks of these materials are especially adapted to the adsorption of gases. The chromium (III) terephthalate-based MIL-101(Cr) is a very stable material which exhibits good adsorption uptakes for hydrogen (H2), carbon dioxide (CO2) and methane (CH4).In this study, syntheses were carried out by different ways and several mineralizing agents such as hydrofluoric acid (HF), acetic acid (CH3COOH) and sodium acetate (CH3COONa) have been tested. Moreover, Activated Carbon (AC) has been introduced in the framework to create an AC incorporated composite material with an enhanced specific surface area. Conventional techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and nitrogen (N2) adsorption isotherms at 77 K were used for materials characterizations.In the aim to evaluate hydrogen storage capacities of these materials, hydrogen adsorption isotherms were measured at 77 K via both volumetric and gravimetric methods, and the obtained results are in good agreement. A hydrogen uptake value of 13.5 wt% has been measured at 77 K and 100 bar for the composite material which shows a great improvement of hydrogen capacity compared to the pristine MIL-101(Cr) (8.2 wt%).Finally, hydrogen adsorption kinetics has been measured at 77 K using volumetric method. The obtained results were compared to the Linear Driving Force (LDF) and a temperature dependent diffusion model was also considered to take into account the temperature variations which occur during the adsorption process
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Banerjee, Tanushree. "Impact of Nickel Doping on Hydrogen Storage in Porous Metal-Organic Frameworks." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2265.
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A supply of clean, carbon neutral and sustainable energy is the most scientific and technical challenge that humanity is facing in the 21st century. Though there is enough fossil fuels available for a few centuries, their use would increase the level of CO2 in the atmosphere. This would lead to global warming and may pose serious threats such as rising of sea level, change in hydrological cycle, etc. Hence there is a need for an alternative source of fuel that is clean and sustainable. Among the many resources considered as an alternative power source, hydrogen is considered one of the most promising candidates. To use hydrogen commercially, appropriate hydrogen storage system is required. Various options to store hydrogen for onboard use include gaseous form in high-pressure tanks, liquid form in cryogenic conditions, solid form in chemical or metal hydrides, or by physisorption of hydrogen on porous materials. One of the emerging porous materials are metal-organic frameworks (MOFs) which provide several advantages over zeolites and carbon materials because the MOFs can be designed to possess variable pore size, dimensions, and metrics. In general, MOFs adsorb hydrogen through weak interactions such as London dispersion and electrostatic potential which lead to low binding enthalpies in the range of 4 to 10 kJ/mol. As a result, cryogenic conditions are required to store sufficient amounts of hydrogen inside MOFs. Up to date several MOFs have been designed and tested for hydrogen storage at variable temperature and pressure levels. The overall results thus far suggest that the use of MOFs for hydrogen storage without chemical and electronic modifications such as doping with electropositive metals or incorporating low density elements such as boron in the MOFs backbone will not yield practical storage media. Such modifications are required to meet gravimetric and volumetric constraints. With these considerations in mind, we have selected a Cr-based MOF (MIL-101; Cr(F,OH)-(H2O)2O[(O2C)-C6H4-(CO2)]3•nH2O (n ≈ 25)) to investigate the impact of nickel inclusion inside the pores of MIL-101 on its performance in hydrogen storage. MIL-101 has a very high Langmuir surface area (5900 m2/g) and two types of mesoporous cavities (2.7 and 3.4 nm) and exhibits exceptional chemical and thermal stabilities. Without any modifications, MIL-101 can store hydrogen reversibly with adsorption enthalpy of 10 kJ/mol which is the highest ever reported among MOFs. At 298 K and 86 bar, MIL-101 can store only 0.36 wt% of hydrogen. Further improvement of hydrogen storage to 5.5 wt% at 40 bar was achieved only at low temperatures (77.3 K). As reported in the literature, hydrogen storage could be improved by doping metals such as Pt. Doping is known to improve hydrogen storage by spillover mechanism and Kubas interaction. Hence we proposed that doping MIL-101 with a relatively light metal possessing large electron density could improve hydrogen adsorption. Preferential Ni doping of the MIL-101’s large cavities which usually do not contribute to hydrogen uptake is believed to improve hydrogen uptake by increasing the potential surface in those cavities. We have used incipient wetness impregnation method to dope MIL-101 with Ni nanoparticles (NPs) and investigated their effect on hydrogen uptake at 77.3 K and 298 K, at 1 bar. In addition, the impact of metal doping on the surface area and pore size distribution of the parent MIL-101 was addressed. Metal content and NPs size was investigated by ICP and TEM, respectively. Furthermore, crystallinity of the resulting doped samples was confirmed by Powder X-ray Diffraction (PXRD) technique. The results of our studies on the successful doping with Ni NPs and their impact on hydrogen adsorption are discussed.
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Barreto, Nilda Sanches Pereira. "Desenvolvimento de membranas para separação de gases contendo MOFs (metal organic frameworks)." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7729.
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Andrade, Hugo Pereira. "Preparação de novas membranas com MOF’s para aplicação em processos de captura de CO2." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/9908.
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Su, Yu-Hsien, and 蘇育賢. "Preparation, Characterization, and Hydrogen Storage Capacity of MIL-101/MIL-53 Metal-organic Frameworks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17576561123629321857.
Full textAbstract:
碩士元智大學
化學工程與材料科學學系
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Both from the point of view of global warming and from that of the inevitable exhaustion of Earth’s oil reserve, worldwide interest is focused on using a clean burning substitute such as hydrogen in place of fossil fuels. However the storage of hydrogen is one of the most important challenges impeding its practical application. Metal–organic frameworks (MOFs) are a new emerging class of crystalline porous materials, displaying very low density, significant thermal stability, and very high surface area. They offer significant opportunities for hydrogen storage. Therefore, the main objectives were to develop and investigate the synthesis methods, fine structural characterization, and capacity of hydrogen storage of MOFs using XRD, FE-SEM/EDS, TEM, BET, TGA, ESCA, and XANES/EXAFS techniques. Experimentally, MOFs were synthesized with different metal nitrates in the presence of different solvents combined with organic linkers. The solvothermal method was used to synthesize the MOFs with the reaction temperatures range from 200 to 220oC. These MOFs were named as MIL-101(Cr), and MIL-53(Al) having the particle size about 0.5~0.7 and 1~4 μm, respectively identified by FE-SEM microphotos. Since as-synthesized MOFs contain many impurities, it may cause low porosity. Therefore the cleaning methods, such as optimum calcination temperatures or washing several times with different solvents at different warm temperatures were effective and approved to improve higher specific surface area and porosity. The specific surface area of MIL-101(Cr) and MIL-53(Al) were 3241 and 1181 m2/g, respectively. N2 adsorption isotherms of MOFs were type I and the distribution of pore diameter curves revealed that MOFs were microporous and mesopores materials. The XRD patterns represented that MOFs had well crystallinity after chemical treatment. EDS data indicated that MOFs consist of C, O elements and different kinds of metals. FTIR spectra exhibited vibrational bands in the usual region of 1400~1700 cm-1 for the carboxylic function and 3000~3500 cm-1 for OH- group of these MOFs. TGA curves showed that these MOFs were stable around 200~400oC. XANES/EXAFS spectroscopy was performed to identify the fine structures of MIL-101(Cr). The XANES spectra indicated that the valence of MIL-101(Cr) was Cr(III). The EXAFS data also revealed that MIL-101(Cr) had a first shell of Cr-O bonding with bond distance of 1.97 A and the coordination number was 5.4. The hydrogen storage capacity of MIL-101(Cr) and MIL-53(Al) were 0.163 and 0.14 wt%, respectively at 450 psig (30 atm) and room temperature measured using high-pressure thermogravimetric analyzer. In order to improve the hydrogen storage capacity of MOFs, metal/activated carbons were mixed with MOFs. FE-SEM microphotos of Pt/AC and Pd/AC indicated that the particle sizes were 2~5 and 5~10 nm, respectively. By using XPS and XANES spectra, it had found that both Pt and Pd species had zero valency. The EXAFS data revealed that Pt/AC and Pd/AC have a first shell of Pt-Pt and Pd-Pd bonding with bond distances of 2.78 and 2.75 A, respectively. Coordination numbers of both nanoparticles were close to 8 with a FCC structure. The catalytic properties of Pt/AC and Pd/AC were studied for hydrogen spillover in MIL-101(Cr) modified by 5 wt % of catalyst. The hydrogen adsorption capacity of modified MIL-101(Cr) was significantly enhanced up to 0.461 wt% by using the secondary spillover by carbon bridges measured at 450 psig and room temperature. In addition, the adsorption thermodynamic of the data was also confirmed using thermodynamic equations for thermodynamic consistency. Under lower pressures, the adsorption heat is affected by adsorption behaviors. The adsorption heats decrease of increasing adsorption capacities. The adsorption heat of hydrogen onto modified MIL-101(Cr) is < 44 kJ/mol using the secondary spillover of carbon bridges under lower pressures.
Books on the topic "MIL-101"
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Ltd, Brooklands Books. Land Rover (Mil) 101 1 Tonne F/C Mnl. Brooklands Books, 2006.
Find full textConference papers on the topic "MIL-101"
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Teo, How Wei Benjamin, Anutosh Chakraborty, and Kim Tiow Ooi. "Adsorption Characteristics of Modified MiL-101(Cr) for Gas (Mainly CH4) Storage Applications." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50751.
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As promising material for gas storage applications, MIL-101(Cr) can further be modified by doping with alkali metal (Li+, Na+, K+) ions. However, the doping concentration should be optimized below 10% to improve the methane adsorption. This article presents (i) the synthesis of MIL-101 (Cr) Metal Organic Frameworks, (ii) the characterization of the proposed doped adsorbent materials by X-ray Diffraction, Scanning Electron Microscopy, N2 Adsorption, Thermo-Gravimetric Analyzer, and (iii) the measurements of methane uptakes for the temperatures ranging from 125 K to 303 K and pressures up to 10 bar. It is found that the Na+ doped MIL-101(Cr) exhibits CH4 uptake capacity of (i) 295 cm3/cm3 at 10 bar and 160 K and (ii) 95 cm3/cm3 at 10 bar at 298 K. This information is important to design adsorbed natural gas (ANG) storage tank under ANG-LNG (liquefied natural gas) coupling conditions.
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Liu, Yong, Jian-Fei Bai, Xiao-Hong Yin, Hong-Tao Duan, and Yan-Fei Zhang. "Catalytic Oxidation Desulfurization over PTA-dispersed MIL-101 under Mild Conditions." In 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmse-16.2016.1.
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Xu, J., Y. Wu, and Y. Liu. "NG.2 - Synthesis of amino-functionalized MIL-101(Cr) as high performance HF gas sensor." In 17th International Meeting on Chemical Sensors - IMCS 2018. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/imcs2018/ng.2.
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Utami, V. J., Fayza Yulia, Nasruddin, Muhammad Arif Budiyanto, and A. Zulys. "CO2/N2 adsorption selectivity using metal-organic framework MIL-101(Cr) for marine engine exhaust model." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0014079.
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Chakraborty, Anutosh, Syed Muztuza Ali, and How Wei Benjamin Teo. "Study of Waste Heat Driven Adsorption Cooling System Employing Doped MiL-101(Cr) and Water as Adsorbent Adsorbate Pair." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50741.
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This article presents the dynamic behaviors of two bed adsorption chiller utilizing the composite adsorbent “immobilization of NH2, -NO2, -OH groups to MiL-101(Cr)” as adsorbent and water as adsorbate, which is based on the experimentally confirmed adsorption isotherms and kinetics data. The experimentally measured MOFs + water based isotherms and kinetics data are fitted with adsorption isotherm models and linear driving force kinetics equations. Compared with the experimental data of conventional adsorption chiller based on zeolites/silica gel-water system, we found that the newly working pair provides better cooling capacity and performances in terms of COP and adsorption bed size. From numerical simulation, it is also found that the cooling capacity can be increased up to 20 percent of the parent silica gel-water adsorption chiller and the COP can be improved up to 25% more at optimum conditions.
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Hosang, George W. "Experimental and Computed Performance Characteristics of High Speed Silicon Nitride Hybrid Ball Bearings." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-110.
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Development testing of hybrid bearings with M.50 rings and HIP’ed silicon nitride balls in small high speed turbojet engines was carried out for several minutes at speeds up to 110,000 rpm. The main rotor system comprised an overhung radial compressor and turbine monorotor assembly with a pair of preloaded 101–size bearings. Estimated aerodynamic thrust of up to 750 N (170 lb) was added to the 200 N (45 lb) preload on the bearing adjacent to the compressor. Some testing was carried out with MIL–L–7808 air/oil mist and some with JP–10 fuel supplied in a similar fashion. After each test phase the bearings were removed for examination and re–used or replaced. Four of the bearings were submitted to inspection with special equipment to measure operating contact angles, as evidenced by the visible ball tracks, and any wear present. Contact angles and other operating characteristics estimated with the Jones, “SHABERTH,” and “ADORE” computer codes were compared with the experimental data.
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Han, Jin-Ye, Gui-Hua Zhang, Yan Wang, Jin-Quan Wan, Ze-Yu Guan, Yong-Wen Ma, and Zi-Min Liu. "Influence of Strong Electronegativity Groups -Cl as the Adsorption Center of PTA@MIL-101-NH²-Cl for the Selective Hydrolysis of Cellulose into Glucose." In 3rd 2017 International Conference on Sustainable Development (ICSD 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icsd-17.2017.4.
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