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Microreactor Coated with Mesoporous Organosilica Thin Film as a Support for Metal Complex Catalysts
Author(s) -
Kataoka Sho,
Inagaki Shinji
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000766
Subject(s) - microreactor , chemistry , catalysis , mesoporous material , cyclooctene , mesoporous organosilica , metal , chelation , heterogeneous catalysis , chemical engineering , bipyridine , inorganic chemistry , mesoporous silica , organic chemistry , crystal structure , engineering
In this study, periodic mesoporous organosilica (PMO) thin films containing 2,2'‐bipyridine ligands (BPy‐PMO) were formed on the inner wall of a microreactor by evaporation‐induced self‐assembly approach. The obtained BPy‐PMO thin films had open mesopores ranging from 8 to 12 nm on the outermost surfaces with the thickness of approximately 50 nm. Since BPy‐PMO has a strong chelating ability to metals, the microreactor coated with BPy‐PMO film can be used as a unique support for continuous flow reactions using various metal complex catalysts. Dichlorodioxomolybdenum(VI) (MoO 2 Cl 2 ) complex was immobilized in the BPy‐PMO layer; the epoxidation of cis ‐cyclooctene with tert ‐butyl hydroperoxide (TBHP) was evaluated in a continuous flow manner. The immobilized catalysts showed the turnover frequency higher than 3000 h – 1 and the turnover number higher than 66000 at 80 °C with maintaining their catalytic activity over 26‐h experiments. These numbers are considerably high compared to Mo catalysts immobilized via conventional methods.