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- Title
Highly Dispersed SiO<sub> x</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts Illuminate the Reactivity of Isolated Silanol Sites.
- Authors
Mouat, Aidan R.; George, Cassandra; Kobayashi, Takeshi; Pruski, Marek; van Duyne, Richard P.; Marks, Tobin J.; Stair, Peter C.
- Abstract
The reaction of γ-alumina with tetraethylorthosilicate (TEOS) vapor at low temperatures selectively yields monomeric SiOx species on the alumina surface. These isolated (-AlO)3Si(OH) sites are characterized by PXRD, XPS, DRIFTS of adsorbed NH3, CO, and pyridine, and 29Si and 27Al DNP-enhanced solid-state NMR spectroscopy. The formation of isolated sites suggests that TEOS reacts preferentially at strong Lewis acid sites on the γ-Al2O3 surface, functionalizing the surface with 'mild' Brønsted acid sites. For liquid-phase catalytic cyclohexanol dehydration, these SiOx sites exhibit up to 3.5-fold higher specific activity than the parent alumina with identical selectivity.
- Subjects
HETEROGENEOUS catalysis; SILANOLS; ACID catalysts; SILICA; ALUMINUM oxide
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 45, p13544
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201505452