Bibliographies thématiques / Microporous /Mesoporous Oxides

Littérature scientifique sur le sujet « Microporous /Mesoporous Oxides »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Microporous /Mesoporous Oxides"

Gounder, Rajamani. « Hydrophobic microporous and mesoporous oxides as Brønsted and Lewis acid catalysts for biomass conversion in liquid water ». Catal. Sci. Technol. 4, n^o 9 (2014) : 2877–86. http://dx.doi.org/10.1039/c4cy00712c.

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Skadtchenko, B. O., et D. M. Antonelli. « 2005 Pure or Applied Inorganic Chemistry Award Lecture — Host–guest inclusion chemistry of electroactive, mesoporous transition metal oxides oxidation and 1-D confinement in one step and why amorphous is better ». Canadian Journal of Chemistry 84, n^o 3 (1 mars 2006) : 371–83. http://dx.doi.org/10.1139/v06-021.

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The flexible oxidation states of mesoporous Nb, Ta, and Ti oxides make them unique amongst porous materials allowing reaction pathways and cascades that are not possible for mesoporous silica or microporous materials such as zeolites. This electronic activity coupled with the 20–30 Å pores and the amorphous wall structure, which provides greater bandwidth (W) and hence an even greater range of redox potentials, leads to a rich variety of host–guest inclusion chemistry, which serves as an unprecedented 1-D analogue to layered 2-D host–guest inclusion reactions studied for decades. In this paper we survey a series of reactions between these mesoporous hosts and a wide variety of organic and organometallic guest species including alkali fullerides, cobaltocene, and other organometallic sandwhich species, and discuss the electronic and magnetic properties of the resulting composites.Key words: mesoporous materials, semiconductors, fullerides, superconductors, oxides, nanomaterials, metallocenes.

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Hu, Xin, Boris O. Skadtchenko, Michel Trudeau et David M. Antonelli. « Hydrogen Storage in Chemically Reducible Mesoporous and Microporous Ti Oxides ». Journal of the American Chemical Society 128, n^o 36 (septembre 2006) : 11740–41. http://dx.doi.org/10.1021/ja0639766.

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Jiao, Feng, et Peter G. Bruce. « Two- and Three-Dimensional Mesoporous Iron Oxides with Microporous Walls ». Angewandte Chemie International Edition 43, n^o 44 (12 novembre 2004) : 5958–61. http://dx.doi.org/10.1002/anie.200460826.

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Jiao, Feng, et Peter G. Bruce. « Two- and Three-Dimensional Mesoporous Iron Oxides with Microporous Walls ». Angewandte Chemie 116, n^o 44 (12 novembre 2004) : 6084–87. http://dx.doi.org/10.1002/ange.200460826.

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Valentini, Antoninho, Neftalı́ L. V. Carreño, Luiz F. D. Probst, Edson R. Leite et Elson Longo. « Synthesis of Ni nanoparticles in microporous and mesoporous Al and Mg oxides ». Microporous and Mesoporous Materials 68, n^o 1-3 (8 mars 2004) : 151–57. http://dx.doi.org/10.1016/j.micromeso.2003.12.021.

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Qin, Hong, Zhi Jia Tan et Qing Wang. « Research on Adsorption of H₂S by Oil Shale Ash ». Advanced Materials Research 463-464 (février 2012) : 133–37. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.133.

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The ash of Huadian oil shale is made to remove H2S in this experiment. XRD and nitrogen adsorption experiments are used to analyze the physical and chemical properties of the ash, the results show that the ash of oil shale has many metal and nonmetal oxides, and also has much microporous and mesoporous, all above is helpful to remove H2S. The sample is modified by different ways to see the change of adsorption capacity. the sample which is modified by alkali and sprinkler is the best adsorbent, but the sample which is modified by microwave does not increase the removal ability obviously.

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Li, Yongfeng, Jiaojiao Su, Guiping Li et Xiufeng Meng. « Facile Synthesis of Super-Microporous Titania–Alumina with Tailored Framework Properties ». Materials 13, n^o 5 (3 mars 2020) : 1126. http://dx.doi.org/10.3390/ma13051126.

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Super-microporous material (pore size 1–2 nm) can bridge the pore size gap between the zeolites (<1 nm) and the mesoporous oxides (>2 nm). A series of super-microporous titania–alumina materials has been successfully prepared via a facile one-pot evaporation-induced self-assembly (EISA) strategy by different solvents using fatty alcohol polyoxyethylene ether (AEO-7) as the template. Moreover, no extra acid or base is added in our synthesis process. When titanium isopropylate is used as the titanium source, these materials exhibit high BET surface areas (from 275 to 396 m2/g) and pore volumes (from 0.14 to 0.18 cm3/g). The sample prepared using methanol as the solvent shows the largest Brunauer–Emmett–Teller (BET) surface area of 396 m2/g. When tetrabutyl titanate is used as the titanium source, these materials exhibit high BET surface areas (from 282 to 396 m2/g) and pore volumes (from 0.13 to 0.18 cm3/g). The sample prepared using ethanol as the solvent shows the largest BET surface area of 396 m2/g.

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Soler-Illia, Galo J. de A. A., Clément Sanchez, Bénédicte Lebeau et Joël Patarin. « Chemical Strategies To Design Textured Materials : from Microporous and Mesoporous Oxides to Nanonetworks and Hierarchical Structures ». Chemical Reviews 102, n^o 11 (novembre 2002) : 4093–138. http://dx.doi.org/10.1021/cr0200062.

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Gong, Bo, Qing Peng, Jesse S. Jur, Christina K. Devine, Kyoungmi Lee et Gregory N. Parsons. « Sequential Vapor Infiltration of Metal Oxides into Sacrificial Polyester Fibers : Shape Replication and Controlled Porosity of Microporous/Mesoporous Oxide Monoliths ». Chemistry of Materials 23, n^o 15 (9 août 2011) : 3476–85. http://dx.doi.org/10.1021/cm200694w.

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Thèses sur le sujet "Microporous /Mesoporous Oxides"

Kasongo, Wa Kasongo Jean B. « Synthesis and characterization of micro- and mesoporous materials for low temperature selective catalytic reduction of nitrogen oxides ». Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2469_1320325768.

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In summary, it has been shown during this study that bimetallic Fe and Mn containing catalysts can be prepared by wet impregnation and not by ion exchange because of the competition between two different metals at different oxidation number. Only a single metallic phase catalyst could be prepared successfully by using ion exchange.

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Schlienger, Sébastien. « Nouvelles voies de synthèses de carbones et céramiques non-oxydes à porosités contrôlées ». Thesis, Mulhouse, 2011. http://www.theses.fr/2011MULH5991.

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Les matériaux nanoporeux (méso- et/ou micro-poreux) visent des applications en relation avec les phénomènes d’adsorption tels que la catalyse, la dépollution, le stockage de gaz ou d’énergie,… Récemment, différents types de synthèses ont donc été développés pour contrôler la porosité et l’adapter aux applications visées : synthèse par voie directe, procédé de nanomoulage, technique de réplication réactive. Pour la très grande majorité d’entre elles, elles servent à l’élaboration des matériaux oxydes méso- et micro-poreuses. L’objectif de ce travail de thèse a donc été d’étendre ces procédés à une gamme de matériaux plus large au niveau des compositions chimiques, tout en gardant un contrôle de la porosité. En effet, les oxydes poreux ont un champ d’application limité du fait, par exemple, de leur température maximale d’utilisation, de leur fragilité sous certaines atmosphères ou encore, dans certains cas, de leurs propriétés d’adsorption mal adaptées. Afin de réduire ces limitations, nous avons cherché à étendre la gamme de composition chimique des matériaux poreux dans le domaine non-oxyde (carbone, céramiques de type nitrure, …) tout en contrôlant leur porosité. Pour cela, différentes approches ont été utilisées. La première approche a consisté à étudier mécanisme de formation des matériaux carbonés mésostructurés obtenus directement par l’auto-assemblage d’un tensioactif et d’un polymère précurseur de carbone. Nous avons alors pu déterminer les paramètres pertinents à contrôler pour la reproductibilité des synthèses ayant lieu, aussi bien, en phase aqueuse que par évaporation de solvant. Des analogies avec les mécanismes de formation des matériaux siliciques ont pu être mises en évidence. [...]
Nanoporous materials (meso-and / or micro-porous) target applications in relation to the adsorption phenomena such as catalysis, waste removal, gas or energy storage.... Recently, various types of syntheses have been developed to control the porosity and adapted to applications: direct route synthesis, nanocasting process, reactive templating. For most of them, they are used for the preparation of meso-and micro-porous oxide materials. The objective of this thesis was therefore to extend these methods to a wider range of materials in chemical composition, while keeping control of the porosity. Indeed, the porous oxides have a limited scope because, for example, their maximum operating temperature, their fragility under certain atmospheres or in some cases, their adsorption properties, are unsuitable. To reduce these limitations, we searched to extend the range of chemical composition of porous materials in the non-oxide field (carbon, nitride ceramics,...) while controlling their porosity. For this, different approaches were used. The first approach consisted to study formation mechanism of mesostructured carbon materials obtained directly by the self-assembly of a surfactant and a polymer carbon precursor. We were then able to determine the relevant parameters to control syntheses reproducibility taking place both in aqueous phase and by solvent evaporation. Analogies with the formation mechanisms of siliceous materials have been identified. With a better understanding of the formation mechanisms, we declined in a second time this method of direct synthesis to other materials by varying the nature of the precursors. Thus, a "green" synthesis of a carbonaceous material with ordered mesoporosity was developed in the absence of all toxic reagents such as formaldehyde and phenol, by using a natural precursor, the mimosa tannin. [...]

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Milne, Nicholas A. Chemical Sciences &amp Engineering Faculty of Engineering UNSW. « Mesoporous, microporous and nanocrystalline materials as lithium battery electrodes ». 2007. http://handle.unsw.edu.au/1959.4/40665.

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In this study it was proposed to investigate the use of 3D metal oxides (specifically titanium oxides) as potential electrode materials for lithium ion batteries. Three different approaches were taken: mesoporous materials to increase the surface area and improve the capacity; nanocrystalline materials to increase the surface area and to investigate any changes that may occur using nanocrystals; and microporous materials that are more open, allowing rapid diffusion of lithium and higher capacities. Of the three categories of materials studies, mesoporous TiO2 was the least promising with low reversible capacities (20 mAh??g-1) due to densification resulting in a loss of surface area. In nanocrystalline rutile an irreversible phase change occurred upon initial intercalation, however after this intercalation occurred reversibly in a single phase mechanism giving capacities of 100 mAh??g-1. A trend in intercalation potential was observed with crystallite size that was related to the ability of the structure to relax and accept lithium. Doping of rutile yielded no real improvement. Brookite gave only low capacities from a single phase intercalation mechanism. TiO2 films produced by a novel electrochemical technique showed that while amorphous films give greater capacities, more crystalline (anatase) films give greater reversibility. Overall, microporous titanosilicates showed the most promise with sitinakite giving a reversible capacity of 80 mAh??g-1 after twenty cycles or double this when dried. The intercalation was found to occur by two steps that generate large changes in crystallite size explaining the capacity fade witnessed. While doping did not improve the performance, cation exchange has proven beneficial. The remaining titanosilicates did not perform as well as sitinakite, however a trend was observed in the intercalation potentials with the wavenumber of the Ti-O Raman stretch. This was due to the covalent nature of the bonding. Upon reduction an electron is added to the bond meaning the energy of the bond determines intercalation potential. Overall, most promise was shown by the microporous titanosilicates. The capacities of sitinakite after drying, are comparable to those of the "zero strain" material Li4Ti5O12. Investigation of the titanosilicates and their ion-exchanged derivatives is a promising path for new lithium-ion battery electrode materials.

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Chapitres de livres sur le sujet "Microporous /Mesoporous Oxides"

Wilde, Nicole, et Roger Gläser. « Solid Materials for Heterogeneous Catalysis ». Dans Contemporary Catalysis : Science, Technology, and Applications, 345–95. The Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781849739900-00345.

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Solid catalysts comprise multiple functionalities and often consist of several constituents including active components, supports, binders, and promoters. In the present chapter, the basic principles of the preparation of solid catalysts in view of the current state-of-the-art are comprehensively described. First, the most widely applied strategies for the preparation of solid supports including sol–gel-chemistry, (co)precipitation and pyrolysis/carbonization are presented. Then, the methods for immobilizing active components on a previously prepared support, i.e., impregnation, deposition precipitation and electrostatic adsorption, are described. A following section deals with the preparation principles of a wide span of bulk catalysts including (mixed) metal oxides, zeolites and related microporous materials, ordered mesoporous materials, materials with multimodal pore structure, and the more recently reported metal–organic and covalent organic frameworks, as well as porous metals. Considering the industrial importance of solid catalysts, methods for catalyst shaping are also presented. Future demands and challenges for catalyst preparation are outlined in a concluding section.

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Kevan, Larry. « Electron Spin Resonance Characterization of Microporous and Mesoporous Oxide Materials ». Dans Handbook of Zeolite Science and Technology. CRC Press, 2003. http://dx.doi.org/10.1201/9780203911167.ch7.

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« Electron Spin Resonance Characterization of Microporous and Mesoporous Oxide Materials ». Dans Handbook of Zeolite Science and Technology, 345–427. CRC Press, 2003. http://dx.doi.org/10.1201/9780203911167-13.

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Macario, A., A. Katovic, G. Giordano, L. Forni, F. Carloni, A. Filippini et L. Setti. « Immobilization of Lipase on microporous and mesoporous materials : studies of the support surfaces ». Dans Oxide Based Materials - New sources, novel phases, new applications, 381–94. Elsevier, 2005. http://dx.doi.org/10.1016/s0167-2991(05)80166-1.

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