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A General Strategy for the Rational Design of Size‐Selective Mesoporous Catalysts
Author(s) -
Zapilko Clemens,
Liang Yucang,
Nerdal Willy,
Anwander Reiner
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200601598
Subject(s) - mesoporous material , catalysis , reagent , selectivity , benzaldehyde , aldehyde , alkyl , mesoporous organosilica , chemistry , fumed silica , molecular sieve , mcm 41 , chemical engineering , materials science , organic chemistry , mesoporous silica , engineering
A series of functionalized mesoporous silicas with cagelike pore topology has been synthesized and screened for size‐selective catalytic transformations. The aluminum‐catalyzed Meerwein–Ponndorf–Verley (MPV) reduction of differently sized aromatic aldehydes (benzaldehyde and 1‐pyrenecarbox‐aldehyde) has been investigated as a test reaction. The catalysts were synthesized in a two‐step grafting sequence comprising pore‐size engineering of mesoporous silicas (SBA‐1, SBA‐2, SBA‐16) with long‐chain alkyl dimethylaminosilanes and surface organoaluminum chemistry with triethylaluminum [{Al(CH 2 CH 3 ) 3 } 2 ]. Size‐selective reaction behavior was found for small pore SBA‐1 materials, and the selectivity could be efficiently tuned by selecting a silylating reagent of appropriate size. The results are compared with the catalytic performance of a large‐pore periodic mesoporous organosilica PMO[SBA‐1] and the nonporous high‐surface‐area silicas Aerosil 300/380.