摘要
烷基苯是一类重要的有机化工基础原料,通过煤化工路线的苯合成气烷基化技术生产烷基苯,减轻中国对石油的过度依赖。本研究通过机械混合制备了ZnAlO_(x)/ZSM-5复合催化剂用于苯与合成气的烷基化反应,复合催化剂两组分的最佳质量比为1∶1,复合氧化物的锌铝最佳物质的量比为2∶1,苯与合成气串联反应中间体为甲醇/二甲醚,甲醇合成催化中心是ZnO组分上的氧空位,甲醇在Al_(2)O_(3)上可脱水为二甲醚,甲醇/二甲醚进而在ZSM-5上与苯发生烷基化反应。由于ZnAlO_(x)的高温甲醇或二甲醚合成特征,与ZSM-5的苯烷基化反应能够有效匹配,实现了高的反应活性和选择性。
Alkylbenzenes are important bulky chemicals.The production of alkylbenzenes through benzene and syngas alkylation technology of coal chemical industry can reduce the domestic dependence on petroleum.In this study,mechanical mixture of ZnAlO_(x) and ZSM-5 were used to catalyze the alkylation reaction of benzene and syngas.The results showed that the best performance catalyst was obtained with the 1∶1 mass ratio of the two components and the 2∶1 molar ratio of zinc to aluminum.It was suggested that the main reaction intermediates of methanol and dimethyl are produced on the O vacancy of ZnO and L acidic center of Al_(2)O_(3) in ZnAlO_(x).And the alkylated benzenes are formed by the reaction of benzene with the intermediates over ZSM-5.Due to the high temperature property of ZnAlO_(x) for methanol synthesis which can accommodate to the reaction of ZSM-5 for benzene alkylation,the high catalytic activity and selectivity was obtained.
作者
韩腾飞
刘建超
杜明仙
徐红
董晋湘
李学宽
葛晖
HAN Teng-fei;LIU Jian-chao;DU Ming-xian;XU Hong;DONG Jin-xiang;LI Xue-kuan;GE Hui(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2021年第11期1620-1630,共11页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金面上项目(22078351)资助。
