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.
61
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
Characterization of solid acids by spectroscopy
TL;DR: In this article, the authors present a review of recent developments in the spectroscopic characterization of acid sites in solids, in particular, NMR, IR, EPR and X-ray photoelectron spectroscopy techniques.
Investigation of Aluminum Site Changes of Dehydrated Zeolite H-Beta during a Rehydration Process by High-Field Solid-State NMR
Zhenchao Zhao,Zhenchao Zhao,Suochang Xu,Suochang Xu,Mary Y. Hu,Xinhe Bao,Xinhe Bao,Charles H. F. Peden,Jianzhi Hu +8 more
TL;DR: In this article, the aluminum site changes of dehydrated H-Beta zeolite during a rehydration process are systematically investigated by 27Al MAS and MQ MAS NMR at a high magnetic field up to 19.9 T.
Periodic DFT Study of Radical Species on Crystalline Silica Surfaces
TL;DR: In this article, periodic DFT (BLYP, B3LYP, and BHandHLYP) calculations have been used to study the properties of SiO• radical defect on quartz, cristobalite, tridymite, and amorphous surface models.