W-MCM-22的制备及催化性能  

PREPARATION AND CATALYTIC PERFORMANCE OF W-MCM-22

作　　者：张文彬[1] 陈晓晖[1,2] 魏可镁[1,2] 

机构地区：[1]福州大学化学化工学院,福建福州350002 [2]福州大学化肥催化剂国家工程研究中心,福建福州350002

出　　处：《石油学报（石油加工）》2006年第B10期100-102,共3页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金资助项目（20306004）

摘　　要：通过动态法以哌啶（PI）作为模板剂，硼酸作为结构承载助剂，硅溶胶作为硅源，钨酸钠作为钨源，水热晶化合成了W—MCM-22介孔分子筛。采用X射线粉末衍射、紫外可见分光光谱等分析手段对合成的材料进行了表征，考察了不同W含量的分子筛在烯丙醇环氧化反应中的催化氧化性能，并与不含金属的MCM-22催化剂进行比较。结果表明，当n（Si）／n（W）〉40时，所合成的分子筛具有典型的MCM-22分子筛的拓扑结构，W原子进入了分子筛骨架内，不存在钨的氧化物。在烯丙醇催化环氧化制缩水甘油反应中，当n（Si）／n（W）-40时，水热晶化法制备的W—MCM-22分子筛的催化活性明显高于不含金属的MCM-22分子筛。Mesoporous W-MCM-22 molecular sieves were prepared for the first time by directly hydrothermal synthesis using silica gel as the source of silicon, sodium tungstate as the tungsten source, piperidine as a structuredirecting agent（SDA） and boric acid as a structure-supporting agent under dynamic state. The catalyst was characterized and analyzed by powder X-ray diffraction and UV-visible spectroscopy. The influence of tungsten content on catalytic performance for epoxidation of allyl alcohol was investigated. The catalytic performances of W-MCM-22 with different ratio of n（Si）/n（W） were compared with the zeolite of MCM-22 without adding sodium tungstate in synthesis. The results showed that the mesostructure of MCM-22 was maintained very well in W-MCM-22 as-synthesized when the ratio of n（Si）/n（W） was above 40 in the gel. The tungsten atoms entered the framework dispersively, and there was no any kind of tungsten oxide in the framework. The W-MCM-22 with n（Si）/n（W） of 40 in the gel showed better catalytic performance obviously than MCM-22 for epoxidation of allyl alcohol to glycidol, with hydrogen peroxide as oxidant in aqueous.

关 键 词：W—MCM-22 水热晶化 哌啶 硼酸 烯丙醇 缩水甘油 

分 类 号：O643[理学—物理化学]