晶化时间对ZSM-5/MCM-48复合分子筛结构及MTG反应性能的影响  

Effects of crystallization time on structure and reaction performance of ZSM-5/MCM-48 composite catalyst for MTG

作　　者：狄佐星[1,2] 李建青[1] 苗鹏杰[1] 李琢[1] 吴晋沪[1] 

机构地区：[1]中国科学院青岛生物能源与过程研究所生物燃料重点实验室,山东青岛266101 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》2014年第2期225-230,共6页Journal of Fuel Chemistry and Technology

基　　金：中国科学院战略先导专项(XDA07070302);"十二五"国家科技支撑计划(2011BAD22B06);中国科学院对外合作重点项目(GJHZ1025);中国科学院重大科研装备研制项目(2011022);山东省"泰山学者"岗位项目(ts200824085)

摘　　要：采用两步晶化法制备ZSM-5/MCM-48微介孔复合分子筛,通过调变前驱体溶胶的晶化时间获得不同结构的ZSM-5/MCM-48基分子筛催化剂。采用XRD、N2-吸附、SEM、TEM、FT-IR和Py-FTIR等手段进行表征,结果表明,前驱体溶胶的晶化时间对ZSM-5/MCM-48复合分子筛的结构和表面酸性产生重要的影响,而特定结构的复合分子筛基催化剂可以显著改变甲醇制汽油(MTG)反应的产物分布,与ZSM-5基催化剂相比显著降低了油品中芳烃和均四甲苯的含量。阐明了其催化作用机制是由于介孔结构的MCM-48对微孔结构的ZSM-5界面或表面的修饰作用。ZSM-5/ MCM-48 micro / mesoporous composite materials were successfully prepared by using a two-step synthesis route. XRD, N2 adsorption SEM, TEM, FT-IR, and Py-FTIR were used to characterize theeffects of the different crystallization time on the structure, surface acidity and reaction performance of methanolto gasoline. The results indicated that, the catalytic mechanism is the surface modification of mesoporous MCM-48 to microporous ZSM-5. Compared with the conventional ZSM-5 based catalyst, it was found that ZSM-5/MCM-48 composite catalyst had excellent low temperature activity and selectivity of gasoline fraction in MTG reaction, and significantly reduced the yield of total aromatic and durene in the oil.

关 键 词：ZSM-5 MCM-48 晶化时间 汽油 芳烃 

分 类 号：O643[理学—物理化学]