Are the Brønsted acid sites in amorphous silica–alumina bridging?
Literature Information
Publication Date
2023-11-01
DOI
10.1039/D3CC04237E
Impact Factor
6.222
Authors
Tommy Yunpu Zhao
View Original
Abstract
Competing models exist to explain the differences in the activity of zeolites and amorphous silica–aluminas. Some postulate that silica–alumina contains dilute zeolitic bridging acid sites, while others favor a pseudo-bridging silanol model. We employed a selective isotope labeling strategy to assess the existence of Si–O(H)–Al bonds using NMR-based distance measurements.
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