不同结构分子筛对正己烷催化裂解反应性能的影响  

Effect of zeolites with different structures on the catalytic cracking performance of n-hexane

作　　者：余倩倩 孙志国 张忠东 高雄厚 高善彬 史得军 刘超伟 曾鹏晖[2] YU Qian-qian;SUN Zhi-guo;ZHANG Zhong-dong;GAO Xiong-hou;GAO Shan-bin;SHI De-jun;LIU Chao-wei;ZENG Peng-hui(Petrochemical Research Institute,PetroChina,Beijing 102206,China;College of Chemical Engineering and Environment,China University of Petroleum(Beijing),Beijing 102206,China)

机构地区：[1]中国石油石油化工研究院,北京102206 [2]中国石油大学(北京)化学工程与环境学院,北京102206

出　　处：《石化技术与应用》2024年第3期171-176,共6页Petrochemical Technology & Application

基　　金：中国石油天然气股份有限公司资助项目(项目编号:2023 ZZ 36)。

摘　　要：对不同结构分子筛IM-5,Al-ITQ-13,USY和ZSM-23的物相、孔结构、晶粒形貌及酸性质进行了对比分析,并在固定床微反装置上对上述4种分子筛催化正己烷裂解反应性能进行了评价。结果表明:4种分子筛均为纯相,具有较高的结晶度,USY具有最大的比表面积、孔体积和酸量,ZSM-23的比表面积和孔体积最小,Al-ITQ-13的酸量最低;USY和IM-5的正己烷转化率较高,说明酸性质与反应活性直接相关,Al-ITQ-13的低碳烯烃总收率和选择性最高,说明低碳烯烃选择性与酸量和孔结构密切相关;具有适宜酸量、较小孔径的Al-ITQ-13在正己烷催化裂解反应中表现出增产低碳烯烃的优异催化性能。The comparative analysis of the phase,pore structure,grain morphology,and acidic properties of zeolites IM-5,Al-ITQ-13,USY,and ZSM-23 with different structures was conducted,and the n-hexane catalytic cracking reaction performance of four zeolites was evaluated in a fixed-bed micro-reaction device.The results showed that all four types of zeolites were pure phases with high crystallinity,USY had the largest specific surface area,pore volume,and acidity,ZSM-23 had the smallest specific surface area and pore volume,and Al-ITQ-13 had the lowest acidity.The high conversion rates of n-hexane in USY and IM-5 indicated a direct correlation between acidic properties and reaction activity.And the total yield and selectivity of light olefins in Al-ITQ-13 were the highest,indicating that the selectivity of light olefins was closely related to acid content and pore structure.Al-ITQ-13 with suitable acidity and smaller pore size exhibited excellent catalytic performance in increasing light olefins in the catalytic cracking reaction of n-hexane.

关 键 词：低碳烯烃 催化裂解 正己烷 IM-5分子筛 Al-ITQ-13分子筛 USY分子筛 ZSM-23分子筛 

分 类 号：TE624.91[石油与天然气工程—油气加工工程]