Journal Article10.1016/J.PMATSCI.2019.04.003
Catalytic materials based on silica and alumina: Structural features and generation of surface acidity
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TL;DR: The structural, surface chemical and catalytic properties of the materials belonging to the SiO2 Al2O3 system are reviewed critically in this article, where amorphous silicas, transitional aluminas, different silica-aluminas (silica-rich and alumina-rich) and protonic zeolites are taken into consideration.
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About: This article is published in Progress in Materials Science. The article was published on 01 Jul 2019. The article focuses on the topics: Amorphous solid & Catalysis.
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Citations
Surface Acid Properties of Nb2o5-P2o5-Sio2 Gel-Derived Catalysts
Gabriella Garbarino,Giovanni Pampararo,Elisabetta Finocchio,Guido Busca,Antonella Gervasini,Sebastiano Campisi,Brigida Silvestri,Claudio Imparato,Antonio Aronne +8 more
Abstract: Amorphous catalytic materials belonging to the Nb2O5-P2O5-SiO2 system were prepared through an original sustainable sol-gel procedure, and characterized by surface area, porosity and acidity measurements. Their acid properties have been investigated by FTIR spectroscopy of adsorbed pyridine, ammonia titration and TPR, as well as by titration with 2-phenylethylamine from organic solution. They present Lewis acidity attributed to niobium surface cationic centers, and Brønsted acidity sufficiently strong to protonate pyridine. The total acidity depends on the niobium content. The conversion of ethanol was investigated by vapor phase Temperature Programmed Reaction, steady-state catalytic experiments and static In Situ FTIR experiments. The samples are active in converting ethanol to ethylene with 100 % selectivity at low conversion (523-573 K), but also produce acetaldehyde by dehydrogenation at higher temperature and conversion. They show an unusually poor activity for the production of diethylether also at low ethanol conversion. Ethoxy groups act as reaction surface intermediates.
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Energy Transfer‐Assisted Color Conversion of Persistent Mechanoluminescence in RhB@SiO<sub>2</sub>/SrAl<sub>2</sub>O<sub>4</sub>:Eu,Dy System for Multilevel Information Encryption
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References
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
60.4K
Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
16.1K
Controlled growth of monodisperse silica spheres in the micron size range
TL;DR: In this article, a system of chemical reactions has been developed which permits the controlled growth of spherical silica particles of uniform size by means of hydrolysis of alkyl silicates and subsequent condensation of silicic acid in alcoholic solutions.
14.2K