干胶法合成多级孔ZSM-5分子筛及其正辛烷催化裂解反应性能  

Synthesis of hierarchical ZSM-5 zeolites by dry-gel conversion method and their catalytic performances for cracking of n-octane

作　　者：肖霞 孙兵 范晓强 孔莲 姜桂元[2] 赵震 Xiao Xia;Sun Bing;Fan Xiaoqiang;Kong Lian;Jiang Guiyuan;Zhao Zhen(Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,Liaoning,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]沈阳师范大学化学化工学院能源与环境催化研究所,辽宁沈阳110034 [2]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《工业催化》2019年第10期29-36,共8页Industrial Catalysis

基　　金：国家自然科学基金“碳基能源转化利用的催化科学”重大研究计划重点项目(No.91845201);国家自然科学基金青年科学基金项目(No.21802098);2017年度沈阳师范大学重大孵化项目(No.51700306);沈阳师范大学博士启动项目(No.BS201801)

摘　　要：采用干胶转化法制备多级孔ZSM-5分子筛,利用XRD、N 2吸附-脱附、SEM、TEM和NH 3-TPD等考察添加三嵌段共聚物(P123)、十六烷基三甲基溴化铵(CTAB)、十二烷基硫酸钠(SDS)和聚乙烯吡咯烷酮(PVP)等不同软模板剂合成分子筛样品的物化性质。结果表明,利用P123软模板剂合成的多级孔ZSM-5分子筛具有介孔(2.5 nm)-介孔(9.5 nm)-微孔复合的梯级孔结构,且分子筛酸强度有所增强。多级孔ZSM-5分子筛应用于正辛烷催化裂解反应中,具有较高的催化活性和低碳烯烃收率,其优异的催化性能可能归结于强酸性质和优异扩散传质能力之间的协同作用。Hierarchical ZSM-5 zeolites were prepared by dry-gel conversion method.XRD,N 2 adsorption-desorption,SEM,TEM and NH 3-TPD were used to investigate the physicochemical properties of the samples synthesized by using different soft templating agents such as triblock copolymer(P123),cetyltrimethylammonium bromide(CTAB),dodecyl sulfate(SDS)and polyvinylpyrrolidone(PVP).The results showed that the ZSM-5 zeolites prepared by addition of P123 possessed mesopores(2.5 nm)-mesopores(9.5 nm)-micropores hierarchical structure and strong acid properties.In catalytic cracking of n-octane,the hierarchical ZSM-5 zeolites exhibited high catalytic activity and light olefines yield,which might be attributed to the synergy effect of strong acid sites and enhanced diffusion mass transfer capacity.

关 键 词：催化剂工程 多级孔ZSM-5分子筛 干胶转化法 软模板剂 催化裂解 

分 类 号：TQ424.25[化学工程] O643.36[理学—物理化学]