【作者】 王广健； 刘义武； 郭亚杰； 杨振兴； 王磊； 徐明霞；

【Author】 WANG Guang-jian, LIU Yi-wu, GUO Ya-jie, YANG Zhen-xing, WANG Lei, XU Ming-xia (Department of Chemistry, Huaibei Coal Normal Collage, Anhui, Huaibei 235000, China; School of Materials Science and Technology, Tianjin University, Tianjin 300072, China)

【机构】 安徽淮北煤炭师范学院化学系； 天津大学材料科学与工程学院；

【摘要】 以十六烷基三甲基溴化铵为模板剂,用可以控制温度的微波辐射2h合成了一系列锆、钛修饰的双功能介孔分子筛,分别用粉末X射线衍射(XRD)、热重-差热分析(TG-DTA)、透射电镜(TEM)对样品进行了表征。结果表明所有的样品都是典型的六方排列并具有较好的水热稳定性。这些材料在催化H2O2液相环氧化苯乙烯显示出较高的催化活性。而且,与传统方法相比,微波合成介孔催化剂大大提高了环氧苯乙烯的选择性,即在苯乙烯转化率为11．2％时,其选择性达到50．5％。更多还原

【Abstract】 A series of bifunctionalized Zr-Ti modified MCM-41 with different amounts of Zr, Ti and only Ti were synthesized by microwave irradiation 2h with controllable temperature using cetyltrimethylammonium bromide (CTAB) as structure template and inexpensive mineral raw materials kaolin as silicon source. Powder X-ray diffraction (XRD), Thermogravimetry-differential thermal analysis (TG-DTA) and HRTEM were used to characterize the samples. Results revealed that all the materials exhibited a typical hexagonal arrangement of mesoporous structure. These materials exhibited higher catalytic activity in the liquid-phase epoxidation of styrene using hydrogen peroxide as oxidant. Moreover, compared to conventional method, the microwave-assisted synthesis of mesoporou molecular sieves greatly improved the selectivity to styrene oxide, e.g., it reached 50.5% at styrene conversion of 11.2% over Zr-Ti-MCM-41 (25).更多还原