摘要
低碳烯烃在化学工业中应用前景广泛,未来将继续作为关键原料发挥重要作用。采用等体积浸渍法对HZSM-5分子筛进行P、Mg改性,利用XRD、NH 3-TPD及BET等技术表征。结果表明,改性后的分子筛仍保持MFI结构,酸性质(强弱酸量、酸强度)及孔结构发生显著变化,比表面积得到优化。Mg-ZSM-5分子筛在甲醇耦合抽余油反应中,初期甲醇转化率即达100%,三烯选择性较母体分子筛提升22.6个百分点,展现出卓越的催化性能。连续运行107 h后,该催化剂依然维持100%的甲醇转化率,三烯选择性稳定在60%以上,三烯收率约30%,证明其优异的稳定性和长周期运行能力,为低碳烯烃的高效制备提供了新的解决方案,具有重要的工业应用价值。
Low-carbon olefins have extensive application prospects in the chemical industry and will continue to play a key role as a key raw material in the future.The HZSM-5 molecular sieve was modified with P and Mg by the equal-volume impregnation method,and its properties were characterized by XRD,NH 3-TPD and BET techniques.The results showed that the modified molecular sieve still maintained the MFI structure,but the acid properties(the amount and intensity of strong and weak acids)and pore structure changed significantly,and the specific surface area was optimized.The Mg-ZSM-5 molecular sieve exhibited excellent catalytic performance in the coupling reaction of methanol and off-gas from coal-to-liquids,with the initial methanol conversion rate reaching 100%,and the triene selectivity increased by 22.6 percentage points compared to the parent molecular sieve.After continuous operation for 107 hours,the catalyst still maintained a 100%methanol conversion rate,with the triene selectivity remaining above 60%and the triene yield being approximately 30%,demonstrating its outstanding stability and long-term operation capability.This provides a new solution for the efficient preparation of low-carbon olefins and has important industrial application potential.
作者
王凤兰
徐亚荣
魏书梅
柴涵语
WANG Fenglan;XU Yarong;WEI Shumei;CHAI Hanyu(School of Chemical and Environmental Sciences,Kashi University,Kashi 844006,Xinjiang,China;Research Institute of Urumqi Petrochemical Company,CNPC,Urumqi 831400,Xinjiang,China)
出处
《工业催化》
2025年第4期66-72,共7页
Industrial Catalysis
作者简介
王凤兰,1997年生,在读硕士研究生。E-mail:2803372967@qq.com;通讯联系人:徐亚荣,1973年生,博士,教授,主要从事石油化工工艺及碳一化工催化剂的研发工作。E-mail:xuyrws@petrochina.com.cn。
