Influence of co-metals on bimetallic palladium catalysts for methane combustion

• Published in: Journal of catalysis 2005-04, Vol.231 (1), p.139-150
• Main Authors: Persson, K., Ersson, A., Jansson, K., Iverlund, N., Järås, S.
• Format: Article
• Language: English
• Subjects: Bimetal; Catalysis; Catalytic combustion; Chemical engineering; Chemistry; EDS; Exact sciences and technology; General and physical chemistry; Kemiteknik; Methane; Palladium; PXRD; TECHNOLOGY; TEKNIKVETENSKAP; TEM; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TPO
• ISSN: 0021-9517; 1090-2694; 1090-2694
• DOI: 10.1016/j.jcat.2005.01.001

The catalytic combustion of methane has been investigated over eight different bimetallic palladium catalysts, comprising the co-metals Co, Rh, Ir, Ni, Pt, Cu, Ag, or Au. The catalysts were characterized by TEM, EDS, PXRD, and temperature-programmed oxidation (TPO). It was found that a catalyst containing both Pd and Pt was the most promising, as it had a high activity that did not decline with time. The catalyst containing Pd and Ag was also a promising candidate, but its activity was slightly lower. For PdCo and PdNi, the co-metals formed spinel structures with the alumina support, with the result that the co-metals did not affect the combustion performance of palladium. For PdRh, PdIr, PdCu, and PdAg, the co-metals formed separate particles consisting of the corresponding metal oxide. These catalysts, except PdRh, showed a stable activity. For PdPt and PdAu, the co-metals formed alloys with palladium, and both catalysts showed a stable activity.