无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (2): 123-128.doi: 10.19964/j.issn.1006-4990.2021-0251

• 催化材料 • 上一篇    

纳米Ga-ZSM-5分子筛的合成及其在苯和稀乙烯烷基化反应中的应用

谢卓涵1(),韩贺1(),李孝国2,张永坤2,侯章贵2,边凯1,张安峰1(),郭新闻1,宋春山1   

  1. 1.大连理工大学精细化工国家重点实验室,辽宁大连 116021
    2.中海油炼油化工科学研究院
  • 收稿日期:2021-04-17 出版日期:2022-02-10 发布日期:2022-03-14
  • 通讯作者: 韩贺,张安峰
  • 作者简介:谢卓涵(1996— ),硕士,研究方向为沸石分子筛催化苯和稀乙烯烷基化制乙苯;E-mail: XieZH@mail.dlut.edu.cn
  • 基金资助:
    国家自然科学基金青年项目(22008019)

Synthesis of nano Ga-ZSM-5 zeolite and its application in alkylation of benzene with dilute ethylene

XIE Zhuohan1(),HAN He1(),LI Xiaoguo2,ZHANG Yongkun2,HOU Zhanggui2,BIAN Kai1,ZHANG Anfeng1(),GUO Xinwen1,SONG Chunshan1   

  1. 1. State Key Laboratory of fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116021,China
    2. Research Institute of Refining and Petrochemicals,CNOOC
  • Received:2021-04-17 Online:2022-02-10 Published:2022-03-14
  • Contact: HAN He,ZHANG Anfeng

摘要:

采用晶种导向法合成了一系列不同硅镓比的纳米级Ga-ZSM-5分子筛,经过挤条成型、酸洗以及高温焙烧等处理后得到了纳米Ga-ZSM-5分子筛催化剂。利用多种表征技术对Ga-ZSM-5分子筛的结构和酸性质进行了表征,研究了其催化苯与稀乙烯烷基化反应性能。结果表明,水热合成的Ga-ZSM-5分子筛具有十字孪晶状形貌,晶粒尺寸均匀。与相同n(Si)/n(T)(T为金属原子)的Al-ZSM-5分子筛相比,Ga-ZSM-5分子筛的酸量和酸强度明显降低。在反应温度为360 ℃、压力为1.4 MPa、乙烯质量空速(WHSV)为1.5 h-1n(苯)∶n(乙烯)=1∶1,n(乙烯)∶n(氮气)=1∶5.67的反应条件下,Ga-ZSM-5分子筛催化剂表现出了较高的乙基选择性,副产物二甲苯比Al-ZSM-5减少了30%~50%,且在100 h内稳定运转,具有更好的抗积炭能力。

关键词: Ga-ZSM-5, 苯与稀乙烯烷基化, 乙苯, 酸性质

Abstract:

A series of nano Ga-ZSM-5 zeolites with different Si/Ga ratio were synthesized with seed-oriented method.Ga-ZSM-5 catalysts were obtained with extrusion molding,acid pickling and high temperature roasting.The structure and acid properties of Ga-ZSM-5 zeolites were characterized by various techniques and their catalytic performance in the alkylation of benzene with dilute ethylene were evaluated.The results showed that hydrothermal synthesized Ga-ZSM-5 molecular sieves exhibited intergrown morphologies and uniform particle size.Compared with Al-ZSM-5 zeolites with the same n(Si)/n(T)(T was metal atom),the acid content and acid strength of Ga-ZSM-5 zeolites were significantly reduced.Under the reaction conditions of T=360 ℃,P=1.4 MPa,weight hourly space velocity(WHSV) of ethylene=1.5 h-1,n(benzene)∶n(ethylene)=1∶1,n(ethylene)∶n(nitrogen)=1∶5.67,Ga-ZSM-5 zeolites catalysts showed higher ethylbenzene selectivity and 30%~50% reduction for xylene selectivity compared with Al-ZSM-5.In addition,Ga-ZSM-5 zeolites catalyst remained stable during the time on stream of 100 h with stronger coke-resistant capacity.

Key words: Ga-ZSM-5, alkylation of benzene with dilute ethylene, ethylbenzene, acid properties

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