ZSM-5型MTA/MTG催化剂的寿命研究进展  

PROGRESS IN THE LIFE OF ZSM-5 MTA/MTG CATALYSTS

作　　者：王丽娟 高文艺[1] 李剑[1] 郭永成 杨丽娜[1] Wang Lijuan;Gao Wenyi;Li Jian;Guo Yongcheng;Yang Li＇na(Liaoning Shihua University of Petrochemical Engineering,Fushun 113001,Liaoning,China;PetroChina Fushun Petrochemical Company Washing Plant,Fushun 113001,Liaoning,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]中国石油抚顺石化分公司洗化厂,辽宁抚顺113001

出　　处：《精细石油化工》2018年第5期72-77,共6页Speciality Petrochemicals

基　　金：辽宁省高等学校杰出青年学者成长计划(LJQ2015062);辽宁省科学技术厅项目(20170540585);辽宁省教育厅项目(L2015296;L2016018);抚顺市科技计划项目(FSKJHT201376)

摘　　要：ZSM-5是典型的MTA/MTG催化剂,其催化活性高,择形选择性好,但其寿命不长,积碳是催化剂失活的主要原因。综述了减少ZSM-5表面积碳的主要措施:调变晶粒尺寸、调变催化剂的酸性质、调变孔道结构,指出催化剂的晶粒尺寸减小后,比表面积和孔容都增大,催化反应过程中反应物和产物的扩散路径缩短,积碳不易堆积,从而延长催化剂的寿命。调变ZSM-5分子筛的酸性位使其均匀而规则的分布,降低外表面酸强度,减少酸中心,抑制副反应的发生都可以降低积碳生成的速率,延长催化剂寿命。引入介孔扩大ZSM-5的孔径,可以促进芳烃类大分子的扩散,减少积碳,提高其催化性能,延长催化剂的寿命。其中调变催化剂的酸性质是提高催化剂寿命的有效手段,认为降低外表面强酸位,减少强酸中心数量是未来研究的主要方向。ZSM-5 is a typical MTA/MTG catalyst with high catalytic activity and good shape selectivity,but its lifetime is short.Carbon deposition is the main reason for catalyst deactivation.The main measures to reduce the surface area carbon of ZSM-5 including the modulation of the crystal size,acid properties,and the pore structure of the catalyst were reviewed.It is pointed out that the specific surface area and pore volume increase after the catalyst crystal size decreases,and the diffusion paths of reactants and products decrease during the catalytic reaction.The carbon deposit is not easy to accumulate,thereby prolonging the life of the catalyst.Modulating the acidity of ZSM-5 molecular sieve tomake it uniform and regular distribution,reducing the acid strength of the outer surface,reducing the acid center,and inhibiting the occurrence of side reactions can reduce the rate of carbon deposition and prolong the life of the catalyst.The introduction of mesopores to expand the pore size of ZSM-5 can promote the diffusion of aromatic macromolecules,reduce carbon deposition,improve its catalytic performance,and prolong the life of the catalyst.The acid property of the modulating catalyst is an effective means to increase the catalyst life.It is believed that reducing the strong acid sites on the outer surface and reducing the number of strong acid sites are the main directions for future research.

关 键 词：分子筛 孔道 酸性 晶粒尺寸 积碳 

分 类 号：O643.36[理学—物理化学]