Effect of Na+ on catalytic performance of CoCe/ZSM-5 catalysts for oxidation of toluene
来源期刊：JOURNAL OF RARE EARTHS2021年第4期
论文作者：Qingping Zou Mingqing Liu Mengjie Fan Yaping Ding Yingwen Chen Shubao Shen
文章页码：409 - 418
摘 要：A CoCe/ZSM-5 catalyst was prepared by ultrasonic-assisted impregnation for the catalytic combustion of toluene.To study the effect of Na+ on catalytic performance of CoCe/ZSM-5 catalysts,a series of different Si/Al ZSM-5 zeolites and catalysts doped with Na were synthesized.The experimental results show that0.71 wt% Na+ can inhibit active growth,generate more active small crystal grains,and promote improvement of the catalytic activity by the grain boundary segregation block mechanism,and the catalyst with 0.71 wt% of Na shows toluene conve rsion of 90 vol% at 250℃.Over 0.71 wt% of Na+content will neutralize the acid centre of the catalyst,lowering the specific surface area of the catalyst and resulting in a gradual decrease in the catalytic activity.
Qingping Zou1，Mingqing Liu2，Mengjie Fan1，Yaping Ding1，Yingwen Chen1，Shubao Shen1
1. College of Biotechnology and Pharmaceutical Engineering,Nanjing Tech University2. Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment
摘 要：A CoCe/ZSM-5 catalyst was prepared by ultrasonic-assisted impregnation for the catalytic combustion of toluene.To study the effect of Na+ on catalytic performance of CoCe/ZSM-5 catalysts,a series of different Si/Al ZSM-5 zeolites and catalysts doped with Na were synthesized.The experimental results show that0.71 wt% Na+ can inhibit active growth,generate more active small crystal grains,and promote improvement of the catalytic activity by the grain boundary segregation block mechanism,and the catalyst with 0.71 wt% of Na shows toluene conve rsion of 90 vol% at 250℃.Over 0.71 wt% of Na+content will neutralize the acid centre of the catalyst,lowering the specific surface area of the catalyst and resulting in a gradual decrease in the catalytic activity.
关键词：
