Immobilization of Vanadyl Acetylacetonate on Amino Functionalized Hollow Silica Nanospheres and Its Catalytic Performance for Selective Oxidation of Thioanisole
Immobilization of Vanadyl Acetylacetonate on Amino Functionalized Hollow Silica Nanospheres and Its Catalytic Performance for Selective Oxidation of Thioanisole
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DOI：
10.3724/sp.j.1088.2012.20520
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发表时间：
2013-01
影响因子：
16.5
通讯作者：
W. Peng;Bai Shiyang;Li Bo;Yang Qihua
中科院分区：
文献类型：
--
作者：
W. Peng;Bai Shiyang;Li Bo;Yang Qihua
将乙酰丙酮氧钒[VO(acac)(2)]固定在氨基功能化介孔二氧化硅中空纳米球以及氨基功能化SBA-15（二维六方介孔结构）和SBA-16（笼状介孔结构）上。在温和的反应条件下，所有非均相催化剂在茴香硫醚的选择性氧化中均表现出对亚砜的高选择性（超过99.0%）。钒纳米球表现出比SBA-15和SBA-16的对应物更高的周转频率，这是由于小纳米颗粒有利于产物和反应物的扩散以及催化活性位点的暴露。该催化剂可以重复使用多次，其活性和选择性几乎没有损失。
Vanadyl acetylacetonate [VO(acac)(2)] was immobilized on amino functionalized mesoporous silica hollow nanospheres, as well as on amino functionalized SBA-15 (2D hexagonal mesostnicture) and SBA-16 (cage-like mesostructure). All the heterogeneous catalysts exhibited high selectivity for sulfoxide (over 99.0%) in the selective oxidation of thioanisole under mild reaction conditions. The vanadium nanospheres exhibited higher turnover frequency than the counterparts of SBA-15 and SBA-16, which is attributed to the fact that the small nanoparticles would facilitate the diffusion of the products and reactants, as well as the exposure of catalytic active sites. The catalysts could be reused several times with little loss of their activity and selectivity.