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W-SBA-15介孔分子筛的直接合成及其对环己烯环氧化反应的催化性能
引用本文:陈杨英,韩秀文,包信和.W-SBA-15介孔分子筛的直接合成及其对环己烯环氧化反应的催化性能[J].催化学报,2005,26(5):412-416.
作者姓名:陈杨英  韩秀文  包信和
作者单位:中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连,116023
摘    要: 分别以Na2WO4和H2WO4为钨源,以正硅酸四乙酯为硅源直接合成了W-SBA-15介孔分子筛样品,并用小角XRD,N2吸附,FT-IR,UV-Vis,SEM和XRF等手段对合成的分子筛进行了表征. 结果表明,只用P123(EO20PO70EO20)为模板剂时,分子筛中钨的含量只是投料量的一半; 而以P123和十六烷基三甲基溴化铵为混合模板剂时,钨能有效地掺杂到SBA-15分子筛中. 当原料中的Si/W摩尔比为40时,W-SBA-15分子筛中的钨物种以高度分散状态存在,且以H2WO4为钨源比以Na2WO4为钨源更易将钨掺杂到SBA-15介孔分子筛中. W-SBA-15分子筛催化剂对环己烯环氧化反应具有较高的催化活性.

关 键 词:W-SBA-15介孔分子筛  钨酸钠  钨酸  环己烯  环氧化反应
文章编号:0253-9837(2005)05-0412-05
收稿时间:2005-05-25

Direct Synthesis of W-SBA-15 Mesoporous Molecular Sieves and Their Catalytic Performance for Epoxidation of Cyclohexene
CHEN Yangying,HAN Xiuwen,Bao Xinhe.Direct Synthesis of W-SBA-15 Mesoporous Molecular Sieves and Their Catalytic Performance for Epoxidation of Cyclohexene[J].Chinese Journal of Catalysis,2005,26(5):412-416.
Authors:CHEN Yangying  HAN Xiuwen  Bao Xinhe
Abstract:Tungsten-containing mesoporous molecular sieves W-SBA-15 were synthesized under conventional hydrothermal conditions in strong acidic solution using Na_2WO_4 or H_2WO_4 as tungsten source and tetraethyl orthosilicate as silicon source. The molecular sieves were characterized by means of small angle XRD, N_2 adsorption, FT-IR, UV-Vis, SEM and XRF. When only P123 (EO_ 20 PO_ 70 EO_ 20 ) was used as structure directing agent, the tungsten content in W-SBA-15 was half that in gel solution. While the mixture of P123 and cetyltrimethylammonium bromide was used as template, the tungsten in gel solution can be effectively incorporated into W-SBA-15. H_2WO_4 was more effective as tungsten source than Na_2WO_4. When the Si/W ratio was 40 in gel solution, the tungsten species in W-SBA-15 were highly dispersed. The W-SBA-15 materials had a high catalytic activity for epoxidation of cyclohexene.
Keywords:W-SBA-15 mesoporous molecular sieve  sodium tungstate  tungstic acid  cyclohexene  epoxidation  
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