The study confirmed that the active sites in amorphous silica-alumina are zeolitic bridging Bronsted sites, using selective isotope labeling and quantitative NMR distance measurements.
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. The identity of the active sites in amorphous silica-alumina has been a hotly debated topic. Using selective isotope labeling and quantitative NMR distance measurements we confirmed that the active sites are indeed zeolitic bridging Bronsted sites.
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