串联催化剂中锌对HZSM-5沸石催化甲醇制芳烃反应性能的影响  

Effect of Zn in tandem catalysts on catalytic performance of HZSM-5 zeolite for methanol to aromatics

作　　者：王顺强 贾艳明 李艳春 张玮[1] 刘平[3] 王俊文[1] 张侃[3] WANG Shun-qiang;JIA Yan-ming;LI Yan-chun;ZHANG Wei;LIU Ping;WANG Jun-wen;ZHANG Kan(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Department of Chemistry,Taiyuan Normal University,Jinzhong 030619,Shanxi,China;Shanxi Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,Shanxi,China)

机构地区：[1]太原理工大学化学化工学院,山西太原030024 [2]太原师范学院化学系,山西晋中030619 [3]中国科学院山西煤炭化学研究所,山西太原030001

出　　处：《天然气化工—C1化学与化工》2021年第3期48-52,99,共6页Natural Gas Chemical Industry

基　　金：山西省重点研发计划项目(201903D121027);中科院关键技术人才项目(YB2021001);中国博士后科学基金资助项目(2019M651079)。

摘　　要：采用等体积超声浸渍法制备了一系列锌改性HZSM-5沸石催化剂,并采用ICP、XRD、FT-IR及NH_(3)-TPD等表征手段对改性催化剂的物理化学性质进行了表征。通过构建串联催化剂针对性地探究了锌在甲醇制芳烃反应中的作用,尤其是对烯烃芳构化过程的影响。结果表明,锌的引入不仅提高了反应中脱氢芳构化活性,还抑制了氢转移反应,进而降低了副产物低碳烷烃的量,使BTX的选择性最高达到了50.66%。此外,实验结果也表明催化剂中锌的含量过高会减少催化剂强酸量,降低BTX的选择性。A series of Zn-modified HZSM-5 zeolite catalysts were prepared by incipient wetness ultrasonic impregnation method,and the physical-chemical properties of the modified catalysts were characterized by ICP,XRD,FT-IR and NH_(3)-TPD.The role of Zn in the reaction of methanol to aromatics,especially in the process of aromatization of olefins,was specifically explored by constructing tandem catalysts.The experimental results show that the introduction of Zn not only improves the dehydrogenation aromatization activity in the reaction,but also inhibits the hydrogen transfer reaction,thereby reducing the amount of by-product low-carbon alkanes,making the selectivity of BTX up to 50.66%.In addition,the experimental results also show that excessive Zn content in the catalyst will reduce the amount of strong acid in the catalyst and reduce the selectivity of BTX.

关 键 词：HZSM-5 甲醇 锌 氢转移 芳构化 串联催化剂 

分 类 号：TQ426.6[化学工程] TQ241.1