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
On the structure of γ-Al2O3
TL;DR: The structure of γ-Al2O3, the most important catalyst support, is still under discussion; especially the positions of the Al3+cations and vacancies are debated as discussed by the authors.
148
Molecular Views on Mechanisms of Brønsted Acid-Catalyzed Reactions in Zeolites.
TL;DR: In this article , a review of the mechanisms of generic transformations catalyzed by Brønsted acid sites of zeolites, combining the information gained from advanced kinetic analysis, in situ, and operando spectroscopies, and quantum chemistry calculations, is presented.
75
A new generation low-cost biochar-clay composite ‘biscuit’ ceramic filter for point-of-use water treatment
Nhamo Chaukura,Nhamo Chaukura,Robert Chiworeso,Willis Gwenzi,Machawe M. Motsa,Wisdom A. Munzeiwa,Welldone Moyo,Innocent Chikurunhe,Thabo T.I. Nkambule +8 more
TL;DR: In this paper, a biochar-clay composite ceramic filter (BCF) was fabricated from clay and sawdust, and the control (CF) from clay only, and its performance was comparable to the sand filtration stage at a local water treatment plant.
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Reutilization of silicon- and aluminum- containing wastes in the perspective of the preparation of SiO2-Al2O3 based porous materials for adsorbents and catalysts.
TL;DR: It is concluded that mesoporous materials can be prepared from wastes, but care to product quality and to overall process efficiency is needed.
55
Beyond γ-Al2O3 crystallite surfaces: The hidden features of edges revealed by solid-state 1H NMR and DFT calculations
Ana Teresa Fialho Batista,Dorothea Wisser,Dorothea Wisser,Thomas Pigeon,David Gajan,Fabrice Diehl,Mickael Rivallan,Leonor Catita,Anne Lesage,Céline Chizallet,Pascal Raybaud +10 more
TL;DR: In this article, the structural and spectroscopic features of edge sites are unravelled thanks to density functional theory (DFT) calculations combined with high field 1H MAS NMR of two high surface area alumina samples exhibiting distinct morphologies.
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References
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TL;DR: In this article, the results of infrared experiments performed on protonic zeolites (like H-FER, H-MFI and H-BEA) and cationic zonitrile (like Co-H-MOR, Li-Mor, Na-mOR, K-MFR, Cs-MDR, NaX, NaY) are described, where the location of the proton sites in the internal cavities and on the external surface are distinguished.
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Toward the aluminum coordination in dealuminated mordenite and amorphous silica-alumina : A high resolution 27Al MAS and MQ mas NMR study
Tie-Hong Chen,Tie-Hong Chen,Kristof Houthoofd,Kristof Houthoofd,Piet J. Grobet,Piet J. Grobet +5 more
TL;DR: In this paper, the aluminum coordination in dealuminated mordenite was investigated using 27 Al MAS and MQ MAS NMR spectroscopy, and it was shown that aluminum species can transition from the crystalline framework lattice state to amorphous silica-alumina state during the process of dealumination.
52
Beckmann rearrangement of cyclohexanone oxime over Silicalite-1: an FT-IR spectroscopic study
TL;DR: The study of cyclohexanone oxime (CEOX) adsorption and reaction into e-caprolactam (CPL) by FT-IR spectroscopy was performed with Silicalite-1 (S-1) as a catalyst as discussed by the authors.
51
Ethanol and diethyl ether catalytic conversion over commercial alumina and lanthanum-doped alumina: Reaction paths, catalyst structure and coking
Gabriella Garbarino,Raam Prasath Parameswari Vijayakumar,Paola Riani,Elisabetta Finocchio,Guido Busca +4 more
TL;DR: In this article, a commercial high-pore-volume alumina and La-doped aluminas have been characterized and tested as catalysts for ethanol conversion to ethylene and diethyl ether and for DEE cracking.
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FTIR spectroscopy and thermodynamics of CO and H2 adsorbed on γ-, δ- and α-Al2O3
Evgeniy N. Gribov,Olena Zavorotynska,Giovanni Agostini,Jenny G. Vitillo,Gabriele Ricchiardi,Giuseppe Spoto,Adriano Zecchina +6 more
TL;DR: In this paper, the adsorption of CO and H2 at the surface of transitional (γ and δ) and corundum (α) phases of Al2O3 is studied by means of FTIR spectroscopy at temperature variable in the 293-60 K (CO) and 293-20 K (H2) intervals with the aims of better clarifying the nature of the surface Lewis centres and evaluate the thermodynamics of the adsorbation process.
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