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
Synthesis of high-Si hierarchical beta zeolites without mesoporogen and their catalytic application in the methanol to propene reaction
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论文类型:期刊论文
发表时间:2018-06-07
发表刊物:CATALYSIS SCIENCE & TECHNOLOGY
收录刊物:SCIE
卷号:8
期号:11
页面范围:2966-2974
ISSN号:2044-4753
摘要:High-Si single-crystalline beta zeolites with intracrystal mesopores were synthesized for the first time and investigated as catalysts for the methanol to propene (MTP) reaction. A fast and mesoporogen-free strategy was developed to fabricate the hierarchical structures by conducting crystallization under low water conditions (H2O/SiO2 = 1). Low water dosage for the synthesis was demonstrated to facilitate the nucleation and crystal growth, but restrained the fusion of individual nanocrystallites inside the particles, which helped the formation of hierarchical structures. The resultant hierarchical beta with Si/Al = 277 exhibited a much longer catalytic lifetime and slower coking rate than conventional zeolite due to the improved utilization of interior acid sites and enhanced molecular diffusion. A higher propene selectivity (50.2-55.5%) and propene/ethene ratio were also found for the hierarchical sample, which can be ascribed to the reduced side reactions of olefin products. The methanol conversion mechanism over the high-Si hierarchical beta was investigated by C-12/C-13-methanol isotopic labeling experiments, which revealed the predominant route of the olefin methylation and cracking mechanism for the formation of olefins.