Effects of Na+ on Cu/SAPO-34 for ammonia selective catalytic reduction

Can Wang , Chen Wang , Jun Wang , Jianqiang Wang , Meiqing Shen , Wei Li


Received July 24, 2017,Revised , Accepted November 02, 2017, Available online November 14, 2017

Volume 30,2018,Pages 20-28

Copper-exchanged chabazite (Cu/CHA) catalysts have been found to be affected by alkali metal and alkaline earth ions. However, the effects of Na+ ions on Cu/SAPO-34 for ammonia selective catalytic reduction (NH3-SCR) are still unclear. In order to investigate the mechanism, five samples with various Na contents were synthesized and characterized. It was observed that the introduced Na+ ion-exchanges with H+ and Cu2 + of Cu/SAPO-34. The exchange of H+ is easier than that of isolated Cu2 +. The exchanged Cu2 + ions aggregate and form “CuAl2O4-like” species. The NH3-SCR activity of Cu/SAPO-34 decreases with increasing Na content, and the loss of isolated Cu2 + and acid sites is responsible for the activity loss.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3