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
余倩倩 1孙志国 1张忠东 1高雄厚 1高善彬 1史得军 1刘超伟 1曾鹏晖2
作者信息
- 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
- 折叠
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.
Abstract
The comparative analysis of the phase,pore structure,grain morphology,and acidic prop-erties of zeolites IM-5,Al-ITQ-13,USY,and ZSM-23 with different structures was conducted,and the n-hexane catalytic cracking reaction perfor-mance 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 conver-sion rates of n-hexane in USY and IM-5 indicated a direct correlation between acidic properties and re-action activity.And the total yield and selectivity of light olefins in Al-ITQ-13 were the highest,indi-cating 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 exhib-ited 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Key words
light olefins/catalytic cracking/n-hexane/IM-5 zeolite/Al-ITQ-13 zeolite/USY zeo-lite/ZSM-23 zeolite引用本文复制引用
出版年
2024
NETL
NSTL
万方数据