Selective oxidation of liquid hydrocarbons over photoirradiated TiO2 pillared clays
Selective oxidation of liquid hydrocarbons over photoirradiated TiO2 pillared clays
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DOI：
10.1016/s0926-860x(01)00863-8
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发表时间：
2002-02
影响因子：
5.5
通讯作者：
Ken-ichi Shimizu;T. Kaneko;T. Fujishima;T. Kodama;H. Yoshida;Y. Kitayama
中科院分区：
文献类型：
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作者：
Ken-ichi Shimizu;T. Kaneko;T. Fujishima;T. Kodama;H. Yoshida;Y. Kitayama
研究了TiO2柱撑粘土（云母、蒙脱土和皂石）对苯和环己烷的选择性光氧化反应。表征结果表明，所有的TiO2柱撑粘土都含有结构相似的锐钛矿型小颗粒TiO2，且TiO2分布在粘土的不同硅酸盐层中。溶剂效应对苯在TiO2柱撑粘土上的光氧化反应有显著影响，在乙腈溶剂中加入10%的水可提高苯的光氧化活性和选择性，在水溶液中进行反应时，光氧化活性和选择性进一步提高.在后一种条件下，TiO2柱撑粘土比TiO2（Degussa P25）对含氧化合物表现出更高的选择性。含氧化合物之间的产物分布也取决于粘土主体的类型，表明TiO2的光催化性能强烈依赖于粘土主体的类型。对于环己烷的光氧化反应，TiO2柱撑粘土表现出比TiO2高得多的选择性，这可能与柱撑粘土的疏水性有关.
Selective photo-oxidation of benzene and cyclohexane were investigated by using TiO2pillared clays (mica, montmorillonite and saponite). The characterization results indicated that all the TiO2pillared clays contain TiO2with similar structure, anatase-like small particles, in the different silicate layers of clays. The solvent effect on the photo-oxidation of benzene on TiO2pillared clay was significant; both the activity and selectivity were increased by an addition of 10% water in acetonitrile solvent and they were further increased when the reaction was performed in an aqueous environment. In the latter condition, TiO2pillared clays showed higher selectivity to oxygenates than TiO2(Degussa P25). The product distribution among oxygenates also depends on the type of the clay host, indicating that the photocatalytic properties of TiO2depend strongly on the type of clay host. For the cyclohexane photo-oxidation, TiO2pillared clay showed much higher selectivity than TiO2, possibly because of the hydrophobic nature of pillared clay.