کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
51040 | 46827 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Improved olefin epoxidation performance of a discrete bis(8-quinolinol)oxovanadium(IV) complex covalently attached on SBA-15 by a metal-template/metal-exchange method Improved olefin epoxidation performance of a discrete bis(8-quinolinol)oxovanadium(IV) complex covalently attached on SBA-15 by a metal-template/metal-exchange method](/preview/png/51040.png)
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 VOIVT. For comparison, its homogeneous counterpart VOIVN and the randomly ligand-grafted heterogeneous analogue VOIVG were also prepared. UV–vis spectra of the VOIV catalysts show VOIVT adopts a more solution-like bis(8-quinolinol) coordination environment than VOIVG. Correspondingly, olefin epoxidation with tert-butyl hydroperoxide shows VOIVT has improved reactivity, epoxide selectivity and recyclability than VOIVN or VOIVG. 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.
Journal: Catalysis Communications - Volume 11, Issue 9, 30 April 2010, Pages 808–811