The enhanced K resistance of Cu-SSZ-13 catalyst for NH3-SCR reaction by the modification with Ce

• Published in: Molecular catalysis Vol. 502; p. 111392
• Main Authors: Guo, De-yu, Guo, Rui-tang, Duan, Chao-peng, Liu, Yuan-zhen, Wu, Gui-lin, Qin, Yang, Pan, Wei-guo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2021
• Subjects: Cu-SSZ-13 catalyst; Deactivation; K resistance; SCR; Ce; SCR; Deactivation; Cu-SSZ-13 catalyst; K resistance
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2021.111392

[Display omitted] •Ce doping could improve the SCR activity effectively for Cu-SSZ-13 catalyst.•The highly active Cu2+ sites might be protected and the catalytic activity could be restored after the addition of Ce.•More ad-NH3 and ad-NOx species with higher reactivity are available on Ce-Cu-SSZ-13 catalyst. Potassium has a deactivation effect on Cu-SSZ-13 catalyst for selective catalytic reduction of NO with NH3 (NH3-SCR). It was demonstrated that the modification of Cu-SSZ-13 catalysts by Ce could improve its K resistance. The characterization of NH3-TPD and H2-TPR suggested that the introduction of Ce on Cu-SSZ-13 could improve its surface acidity and redox ability. Moreover, the content of Cu2+ and chemisorbed oxygen were markedly restored under the situation that Ce and K elements were coexistent on catalyst surface. The synergetic effect between Ce and Cu might be the major reason for the great K resistance and the excellent SCR performance.