Sol-gel synthesis, characterization and catalytic property of silicas modified with oxomolybdenum complexes
Sol-gel synthesis, characterization and catalytic property of silicas modified with oxomolybdenum complexes
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DOI：
10.1016/j.molcata.2005.06.050
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发表时间：
2005-11
影响因子：
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通讯作者：
Ge Wang;Lin-Yan Feng;R. Luck;D. Evans;Zhiqiang Wang;X. Duan
中科院分区：
文献类型：
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作者：
Ge Wang;Lin-Yan Feng;R. Luck;D. Evans;Zhiqiang Wang;X. Duan
通过溶胶-凝胶法将MoO 2Cl 2（OPMePh 2）2衍生的二氧钼（VI）物种引入到二氧化硅基质中，可以获得活性固体氧化催化剂。通过元素分析、XRD、N2-物理吸附、FT-IR、FT-Raman、UV-vis和固体MAS NMR等手段对催化剂进行了表征，并提出了MoO 2Cl 2（OPMePh 2）2与正硅酸乙酯（TEOS）反应的途径。在叔丁基过氧化氢（TBHP）存在下，在环己烯的环氧化中测试钼催化剂。环己烯的转化率和环氧化物的选择性都很高，并随反应温度的升高而进一步提高。
Active solid oxidation catalysts can be obtained by incorporating dioxomolybdenum(VI) species derived from MoO2Cl2(OPMePh2)2into silica matrices via a sol–gel method. The supported catalyst has been characterized by elemental analysis, XRD, N2-physisorption, FT-IR, FT-Raman, UV–vis and solid-state MAS NMR spectroscopy, and a pathway for the reaction between MoO2Cl2(OPMePh2)2and tetraethoxysilane (TEOS) is suggested. The molybdenum catalyst was tested in the epoxidation of cyclohexene in the presence of tert-butyl hydroperoxide (TBHP). The conversion of cyclohexene and the selectivity to the epoxide were very high and increased further on raising the reaction temperature.