Abstract
Zeolites with the MFI topology and Si:M (M = Al, B) ranging from pure silica to 20:1 were employed as supports for molybdenum oxide centers to catalyze the olefin metathesis reaction of ethylene and 2-butene to form propylene. Pure-silica MFI doubled the metathesis activity against a comparable amorphous silica support. Incorporation of trivalent aluminum or boron heteroatoms into the MFI support had a significant impact on the catalytic performance. While strongly acidic sites generated by Al incorporation decreased the overall metathesis rate from 1.1 × 10–7 mol s–1 gcat–1 to 3.9 × 10–9 mol s–1 gcat–1 after 8 h on stream, less polarizable sites generated by B incorporation decreased the rate only to 8.3 × 10–8 mol s–1 gcat–1. Na+ and K+ ion exchange of the Al-containing MFI partially mitigated the deleterious effect of the strong Al heteroatoms at the cost of altering the molybdenum configuration away from active states, as observed by Raman spectroscopy. This work demonstrates that structured silica su...
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