期刊
CATALYSIS COMMUNICATIONS
卷 11, 期 9, 页码 808-811出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2010.02.021
关键词
Metal-template method; Olefin epoxidation; 8-quinolinol; Oxovanadium; SBA-15
资金
- National Basic Research Program of China [200403217804]
- National Natural Science Foundation of China [20673046]
A metal-template/metal-exchange method was used for the covalent attachment of a discrete bis(8-quinolinol) oxovanadium(IV) complex onto mesoporous silica SBA-15 to obtain a heterogeneous catalyst (VOT)-T-IV. For comparison, its homogeneous counterpart (VON)-N-IV and the randomly ligand-grafted heterogeneous analogue VO(IV)G were also prepared. UV-vis spectra of the VOIV catalysts show (VOT)-T-IV adopts a more solution-like bis(8-quinolinol) coordination environment than VO(IV)G. Correspondingly, olefin epoxidation with tert-butyl hydroperoxide shows (VOT)-T-IV has improved reactivity, epoxide selectivity and recyclability than (VON)-N-IV or VO(IV)G. The homogeneity of the discrete bis(8-quinolinol)oxovanadium(IV) complex immobilized on SBA-15 should be responsible for the superior performances of the templated catalyst. (C) 2010 Elsevier B.V. All rights reserved.
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