浸渍方法对Cs/HX分子筛催化剂碱性及其催化甲苯甲醇烷基化反应性能的影响  

Influences of Impregnation Method on the Basicity of Cs/HX and Its Catalytic Performance in Alkylation of Toluene With Methanol

作　　者：王群龙[1] 赵国庆[1] 李军辉[1] 王亚楠[1] 陈焕辉[1] 朱志荣[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《石油学报（石油加工）》2014年第5期785-791,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51174277);上海市重点基础研究项目(11JC1412500)资助

摘　　要：采用直接浸渍、真空浸渍、超声波浸渍3种方法制备了一系列不同的碱性分子筛催化剂Cs/HX,并应用于甲苯甲醇烷基化催化反应,同时采用XRD、NH3-TPD、CO2-TPD、BET、AAS和Py-IR表征考察了浸渍方法对Cs/HX催化剂酸碱性及烷基化反应性能的影响。结果表明,采用3种浸渍方法所制得的Cs/HX分子筛催化剂的Cs2O负载量不同,分子筛孔道结构和酸碱性也存在明显差异。采用直接浸渍法制备的Cs/HX碱性较强,B酸中心的量更少,因此其催化甲苯甲醇侧链烷基化反应的苯乙烯选择性较高,并具有较高的催化反应活性。A series of base zeolite catalysts Cs/HX were prepared,respectively,by direct impregnation,vacuum impregnation and ultrasonic impregnation methods,which were used as the catalyst for alkylation of toluene with methanol.The physico-chemical properties of prepared Cs/HX samples were characterized by XRD,NH3-TPD,CO2-TPD,BET,AAS and Py-IR.The results indicated that the loading amounts of Cs2 O on Cs/HX prepared with different impregnation methods were varied,and there was also the obvious difference in their basicity properties and the pore structure.The Cs/HX prepared by direct impregnation possessed the strongest basicity and lest Brnsted acidic sites among the three Cs/HX prepared by different impregnation methods,and thus showed the high selectivity of styrene and the high reactivity in the catalytic side-chain alkylation of toluene with methanol.

关 键 词：分子筛 浸渍 碱性 酸性 烷基化 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]