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New Insights into the Spatial Distribution of Aluminium in Various Mesoporous Aluminosilicates
Author(s) -
Serwicka Ewa M.,
Mokaya Robert,
Połtowicz Jan,
Jones William
Publication year - 2002
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/1439-7641(20021018)3:10<892::aid-cphc892>3.0.co;2-h
Subject(s) - aluminosilicate , mesoporous material , cyclohexene , catalysis , aluminium , crystallite , amorphous solid , materials science , selectivity , mesoporous silica , chemistry , chemical engineering , crystallography , organic chemistry , composite material , engineering
Outside the wall : The spatial distribution of framework Al on mesoporous aluminosilicates (MAS) was probed with a simple tool, the oxidation of cyclohexene over metal (Mn) porphyrins supported on MASs. The porphyrins are bound on framework Al sites and therefore their selectivity can be related to the location of Al. Porphyrins bound on the external surface catalyse both allylic oxidation and epoxidation of cyclohexene whereas those bound internally (on pore wall surfaces) can only catalyse allylic oxidation. The picture shows the selectivity pattern over Al‐MCM‐41 and Al‐HMS/Al‐MMS supported catalysts and indicates a crucial difference in the spatial distribution of framework Al in these MAS.