FAU—BEA核-壳结构沸石复合物及其对枯烯的催化裂解作用  

THE CORE-SHELL ZEOLITE COMPOSITE FAU-BEA AND ITS CATALYTIC CRACKING IN CUMENE

作　　者：郑家军[1] 郭群[1] 张喜文[1,2] 王琰[1] 秦波[2] 孙万付[2] 李瑞丰[1] 

机构地区：[1]太原理工大学教育部煤科学与技术重点实验室,山西太原030024 [2]中国石化抚顺石油化工研究院,辽宁抚顺113001

出　　处：《石油学报（石油加工）》2008年第B10期208-212,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工集团公司项目（107009）资助 致谢：感谢中国石油化工集团公司对本课题的资助.

摘　　要：通过将表面改性的FAU沸石加入到合成BEA的反应混合物中，经水热晶化，制备了以FAU沸石为核、以纳米多晶BEA沸石为壳的新型双微孔沸石核-壳催化材料。NH3-TPD测试表明，实验合成的沸石复合物弱酸位较对应的机械混合物降低约23％，而中强酸位则增加了约25％。N2吸附-脱附实验表明，在沸石复合物中产生了一种新的介孔结构，其孔容为0．14～0.17cm3／g。该材料新的表面酸性和新的孔道结构对枯烯催化裂化具有较高的活性，当反应温度在250～325℃之间，枯烯在沸石复合物上的转化率较在对应的机械混合物上的转化率高约30％。A zeolite composite FAU-BEA was successfully synthesized by adding TEA＋ modified Na-FAU zeolite to the reaction mixture of BEA zeolite. The NH3-TPD and N2 adsorption-desorption characterized results showed that the composite was composed of FAU zeolite as a eore and nanometer-sized BEA zeolite as a polycrystalline shell, and was of the dual microporous structures of both FAU and BEA zeolites and the new mesoporous structure with a mesoporous volume of 0.14--0.17 cm3/g. As compared with the eorresponding mechanical mixture, the weak acid site in the composite is lowered by 23%, the medium-strong acid site is however enhanced by 25 %. The catalytic cracking tests indicated that the composites H-FAU-BEA showed much higher activity in cumene catalytic cracking, and the conversion of eumene on the zeolite composite was more 30% higher than that on the corresponding mechanical mixture at the reaction temperature in the range of 250--325℃.

关 键 词：核-壳结构 沸石复合物 枯烯 催化裂化 

分 类 号：TQ426.95[化学工程]