Effect of pore-size distribution on Ru/ZSM-5 catalyst for enhanced N2 activation to ammonia via dissociative mechanism

作者：Jihui Cai,Congying Wang,Yi Liu,Jun Ni,Bingyu Lin,Xiuyun Wang,Jianxin Lin,Lilong Jiang

摘要：In the present study,a series of Ru/ZSM-5 catalysts with different pore-size distributions were prepared and investigated for NH3 synthesis.Our studies indicate that Ru/ZSM-5-Mic with micropore structure exhibits superior NH3 synthesis rate,which is much higher than those of Ru/ZSM-5-Mac(with macroporous structure)and Ru/ZSM-5-Mes(with mesoporous structure)catalysts.A series of TPD experiments demonstrate that pore-size distributions play an important role in N2 adsorption and activation over Ru/ZSM-5.Moreover,the addition of La significantly promotes the NH3 synthesis performance over Ru/ZSM-5-Mic.Additionally,in situ DRIFTS studies indicate that the main intermediate species over Ru/ZSM-5-Mic are-NH2,and most of the surface hydrogen species desorb following the H2O-formation pathway.

发文机构：National Engineering Research Center of Chemical Fertilizer Catalyst

关键词：Ru/ZSM-5LaAmmoniasynthesisPore-sizedistributionReactionpathwayRareearths

分类号： TQ426[化学工程]