Effect of Ion-Exchange Sequences on Catalytic Performance of Cerium-Modified Cu-SSZ-13 Catalysts for NH3-SCR

Cerium-modified Cu-SSZ-13 catalysts were prepared by an aqueous ion-exchange method, and Ce Cu incorporated through different sequences. The results of NH3-SCR activity evaluations displayed that Cu1(CeCu)2 catalyst presented excellent catalytic activity, over 90% NOx conversion was obtained across the temperature range 200–500 °C. characterization showed sequence species influenced crystallinity zeolites coordination Al. A small amount could participate in reduction process change location environment copper ions. Furthermore, Ce-modified possessed more acidic sites due to their containing replacement movement preparation process. cooperation strong redox abilities NH3 storage capacity led increase active adsorbed adsorption resulted better Cu1(CeCu)2.