Influences of doping and thermal stability on the catalytic performance of CuO/Ce20M1Ox (M = Zr, Cr, Mn, Fe, Co, Sn) catalysts for NO reduction by CO. Issue 114 (5th December 2016)

• Record Type: Journal Article
• Authors: Deng, Changshun; Qian, Junning; Yu, Chuxuan; Yi, Yunan; Zhang, Pan; Li, Wei; Dong, Lihui; Li, Bin; Fan, Minguang
• Is Part Of: RSC advances. Volume 6:Issue 114(2016)
• Page Start: 113630
• Page End: 113647
• Publication Date: 2016-12-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra21740k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The doping of variable valence metal cations into CeO2 is beneficial for catalytic NO reduction by CO. Abstract : For NO reduction by CO with CuO/Ce20 M1 O x (M = Zr, Cr, Mn, Fe, Co, Sn) catalysts, the results imply that for fresh catalysts, the doping variable valence M x + is more conducive to an increase in the oxygen vacancies, the content of unsaturated metal cations on the surface, and the reduction capacity. The Cu/CeMn and Cu/CeSn samples exhibited better potential; after aging, the samples doped with Cr 6+, Mn 4+, and Co 3+ had poor physicochemical properties, but doping with Zr 4+, Fe 3+, and Sn 4+ resulted in better thermal stability. The Cu/CeSn sample exhibited the best catalytic properties and thermal stability, which are closely related to its structure retention, oxygen vacancies, the content of the surface chemical adsorption oxygen and surface unsaturated metal cation, and reduction capacity, whether it is fresh or aged. Finally, in order to further understand the interaction between the CO and NO probe molecules with the catalyst surface, a possible reaction mechanism for NO reduction by CO on a Cu/CeSn catalyst is tentatively proposed.