期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 1, 页码 230-234出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201609494
关键词
alcohols; aluminosilicates; amorphous materials; density functional calculations; reaction kinetics
The mechanism of isopropanol dehydration on amorphous silica-alumina (ASA) was unraveled by a combination of experimental kinetic measurements and periodic density functional theory (DFT) calculations. We show that pseudo-bridging silanols (PBS-Al) are the most likely active sites owing to the synergy between the Bronsted and Lewis acidic properties of these sites, which facilitates the activation of alcohol hydroxy groups as leaving groups. Isopropanol dehydration was used to specifically investigate these PBS-Al sites, whose density was estimated to be about 10(-1) site nm(-2) on the silica-doped alumina surface under investigation, by combining information from experiments and theoretical calculations.
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