Acidity and catalytic activity of the mesoporous aluminosilicate molecular sieve MCM-41
The acidity and catalytic properties of aluminosilicate mesoporous molecular sieves with the
MCM-41 structure and bulk Si/Al ratios in the 10–60 range have been investigated. The
incorporation of 4-coordinate aluminium into the structure of MCM-41 generates both
BrØnsted and Lewis acid sites in amounts increasing with the degree of incorporation.
However, the BrØnsted/Lewis acid population ratio is independent of the content of
aluminium. The number and strength of acid sites generated are comparable to those of a …
MCM-41 structure and bulk Si/Al ratios in the 10–60 range have been investigated. The
incorporation of 4-coordinate aluminium into the structure of MCM-41 generates both
BrØnsted and Lewis acid sites in amounts increasing with the degree of incorporation.
However, the BrØnsted/Lewis acid population ratio is independent of the content of
aluminium. The number and strength of acid sites generated are comparable to those of a …
Abstract
The acidity and catalytic properties of aluminosilicate mesoporous molecular sieves with the MCM-41 structure and bulk Si/Al ratios in the 10–60 range have been investigated. The incorporation of 4-coordinate aluminium into the structure of MCM-41 generates both BrØnsted and Lewis acid sites in amounts increasing with the degree of incorporation. However, the BrØnsted/Lewis acid population ratio is independent of the content of aluminium. The number and strength of acid sites generated are comparable to those of a pillared acid-activated clay and lower than in zeolite H-Y with Si/Al=3.65. Aluminosilicate MCM-41 is a moderate catalyst for the conversion of cumene which proceeds predominantly via catalytic cracking to propene and benzene. The sample of MCM-41 with the highest content of framework aluminium (Si/Al=10) has the largest number of BrØnsted acid sites and exhibits highest catalytic activity.
Springer
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