A mesoporous silica-supported bifunctional Ti-Ru-SBA-15 catalyst with an ordered two-dimensional hexagonal mesostructure was prepared by postmodifying organometallic complexes RuCl2(PPh3)3 and Ti(OiPr)4 onto PPh2-SBA-15. During the tandem addition-isomerization reaction of benzaldehyde under microwave irradiation in aqueous media, the mesoporous silica-supported Ti-Ru-SBA-15 catalyst exhibited high catalytic activity (more than 97%) and selectivity (up to 96%). Such a catalyst could be recovered easily and used repetitively five times without significantly affecting its catalytic activity and selectivity.
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Liu et al. (2009) studied this question.
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