Metal-organic framework-derived CeO-ZnO catalysts for CH-SCR of NO: an DRIFTS study

• Published in: RSC advances Vol. 9; no. 33; pp. 19236 - 19242
• Main Authors: Zhao, Ling, Zhang, Yu, Bi, Sining, Liu, Qifeng
• Format: Journal Article
• Language: English
• Published: 18.06.2019
• ISSN: 2046-2069
• DOI: 10.1039/c9ra03103k

Metal-organic framework (MOF)-based derivatives have attracted an increasing interest in various research fields. Here, we synthesized CeO 2 -ZnO catalysts through the complete thermal decomposition of the Ce/MOF-5 precursor. The catalysts were characterized using XRD, FTIR, TG-DSC, SEM and H 2 -TPR. It is found that the as-prepared CeO 2 -ZnO is favorable for strengthening the interaction between Ce 4+ and Zn 2+ . A significant improvement in the catalytic performance for C 3 H 6 -SCR of NO was found over the Ce-doped catalysts with the highest N 2 yield of 69.1% achieved over 5% CeO 2 -ZnO. In situ DRIFTS and NO-TPD experiments demonstrated the formation of monodentate nitrates, bidentate nitrates, chelating nitrite, nitro compounds, nitrosyl and C x H y O z species (enolic species and acetate) on the surface, followed by the formation of hydrocarbonate or carbonate as intermediates to directly generate N 2 , CO 2 and H 2 O. Metal-organic framework (MOF)-based derivatives have attracted an increasing interest in various research fields. Here, we synthesized CeO 2 -ZnO catalysts through the complete thermal decomposition of the Ce/MOF-5 precursor.