个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职:盘锦校区管委会副主任兼教学与科研工作部部长
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:化工学院
学科:工业催化. 物理化学
办公地点:化工实验楼B427
联系方式:18641143913
电子邮箱:guoxw@dlut.edu.cn
In Situ Aluminum Migration into Zeolite Framework during Methanol-To-Propylene Reaction: An Innovation To Design Superior Catalysts
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论文类型:期刊论文
发表时间:2018-06-20
发表刊物:INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
收录刊物:SCIE
卷号:57
期号:24
页面范围:8190-8199
ISSN号:0888-5885
摘要:This work involves methanol-to-propylene (MTP) conversion over aluminosilicate MFI (ZSM-5), borosilicate MFI (B-ZSM-5), and all-silica MFI (Silicate-1). Both B-ZSM-5 and Silicate-1 were inactive in MTP reaction. However, extruded Silicate-1 sample prepared by extrusion with Al2O3 binder, followed by acid washing treatment, displayed a rapid increase in methanol conversion in the initial 30 h time on stream (TOS), and then retained 99% methanol conversion, higher propylene selectivity (52.2%), and higher propylene/ethylene ratio (11.3) for 400 h TOS. Silicate-1 modified with AlCl3 or Al(NO3)(3) showed similar catalytic performance as the extruded samples. Several AlCl3 -modified Silicate-1 samples after various TOS values were regenerated and characterized by NH3 -termperature-programmed desorption (TPD), Fourier transform infrared (FT-IR) spectroscopy, and Al-22 magic angle spinning nuclear magnetic responance (MAS NMR). The results point to continuous aluminum insertion into Silicate-1 framework during reaction in situ, which rationalizes the superior catalytic performance. By analyzing catalytic performances of AlCl3-modified samples with different amounts of defect sites, we concluded that Al migration is related to the defect sites. Finally, a catalyst with a much longer lifetime of 960 h and 53.2% propylene selectivity was developed by incorporating Al migration into hierarchical samples.