文献类型：期刊文献

中文题名：在溶胶-凝胶法制备的MoO_3/SiO_2催化剂上丙烯的环氧化反应

英文题名：Epoxidation of Propylene with Cumene Hydroperoxide over MoO_3/SiO_2 Catalyst Prepared by Sol-Gel Method

作者：王新宏[1];卢冠忠[1];刘晓晖[1];郭杨龙[1];王筠松[1]

机构：[1]华东理工大学工业催化研究所,上海200237

年份：2002

卷号：23

期号：6

起止页码：498

中文期刊名：催化学报

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目 (2 0 173 0 15 );教育部博士点专项基金资助项目 (2 0 0 10 2 5 10 0 6);上海市基础研究重点项目(0 2DJ14 0 2 8)

语种：中文

中文关键词：MoO3/SiO2催化剂;溶胶-凝胶法;氧化钼;二氧化硅;过氧化氢异丙苯;丙烯;环氧化反应;环氧丙烷

外文关键词：sol gel method, molybdenum oxide, silica, oxide catalyst, cumene hydroperoxide, propylene,epoxidation, propylene oxide

摘要：以sol gel法制备了MoO3 /SiO2 催化剂 ,并用BET比表面积测定 ,XRD和FT IR等手段对催化剂进行了表征 ;研究了以过氧化氢异丙苯为氧化剂的丙烯一步环氧化反应 ,考察了催化剂的制备条件和反应条件对丙烯环氧化反应的影响 .结果表明 ,在制备过程中 ,酸性水解剂对MoO3 /SiO2 催化剂的分散度、比表面积和催化性能有较大的影响 .用HCl溶液作为水解剂制备的催化剂 ,其性能明显优于用HNO3 或HAc作水解剂制备的催化剂 .在 110℃和 0 6MPa的条件下反应 2h ,过氧化氢异丙苯转化率为 89% ,环氧丙烷选择性为 80 % .
MoO 3/SiO 2 catalyst was prepared by sol gel method at low temperature, in which ammonium heptamolybdate and tetraethoxysilane (TEOS) were used as molybdenum and silica precursor, respectively. The catalyst samples were characterized by N 2 adsorption, XRD and FT IR. The results show that the MoO 3/SiO 2 has higher surface area ( e.g. A =363 8 m 2/g for 10%MoO 3/SiO 2) and MoO 3 is highly dispersed on SiO 2. Different acidic hydrolysts (HCl, HNO 3 and HAc) used in the preparation of catalyst can affect obviously the surface area of MoO 3/SiO 2 catalyst and the dispersion of MoO 3 on SiO 2. MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, exhibits higher surface area and more uniform dispersion of MoO 3 on support than that prepared using other hydrolysts. The catalytic performance of MoO 3/SiO 2 for the epoxidation of propylene to propylene oxide by 30% cumene hydroperoxide was examined and the effects of reaction conditions (such as temperature, time, pressure, solvent and basic depressor) were studied in detail. The results show that the tert butanol is an available solvent and the epoxidation of propylene can be promoted by adding basic depressor into the solvent. When NaHCO 3 ( ρ =2 5 g/L ) was used as basic depressor, the selectivity for propylene oxide could increase. 15%MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, showed higher activity and selectivity for propylene oxide, for instance, using tert butanol as solvent and at 110 ℃ and 0 6 MPa for 2 h, the conversion of cumene hydroperoxide is 89% and the selectivity for propylene oxide is 80%.