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Direct Spectroscopic Evidence for Isolated Silanols in SiOx/Al2O3 and Their Formation Mechanism

TitleDirect Spectroscopic Evidence for Isolated Silanols in SiOx/Al2O3 and Their Formation Mechanism
Publication TypeJournal Article
Year of Publication2017
AuthorsMouat, AR, Kobayashi, T, Pruski, M, Marks, TJ, Stair, PC
JournalJournal of Physical Chemistry C
Volume121
Pagination6060-6064
Date Published03
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberWOS:000397546300024
Keywordsaluminas, aluminosilicates, amorphous, bronsted acid sites, catalysts, chemistry, dynamic nuclear-polarization, hydrocracking, Materials Science, quantification, silica, surface, Technology - Other Topics, water
Abstract

pted as a postgrafting treatment for CLD. Insight into the formation mechanism of these sites is obtained via in situ monitoring of the TEOS + gamma-Al2O3 reaction in an environmental diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) cell. Upon calcination, the DRIFTS spectra of SiOx/Al2O3 reveal a signature unambiguously assignable to isolated Bronsted-acidic silanol species. Surprisingly, the results of this study indicate that the method of preparing SiOx/Al2O3 catalysts is less important to the final structure of the silanol sites than the post-treatment conditions. This finding should greatly simplify the methods for synthesizing site-isolated, Bronsteciacidic SiOx/Al2O3 catalysts.

DOI10.1021/acsjpcc.6b11196
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3D Catalysis

Alternate JournalJ. Phys. Chem. C