PdCeAlO氧化CH4.pdfVIP

Top Catal (2013) 56:410–415 DOI 10.1007/s11244-013-9988-2 ORIGINAL PAPER Methane Oxidation Over Pd Supported on Ceria–Alumina Under Rich/Lean Cycling Conditions Sheedeh Fouladvand • Stefan Schernich • • • • ¨ ¨ Jorg Libuda Henrik Gronbeck Torben Pingel Eva Olsson • Magnus Skoglundh • Per-Anders Carlsson Published online: 26 February 2013 Springer Science+Business Media New York 2013 Abstract Catalysts with highly dispersed palladium on CO2, NOx and particulate matter, as compared to com- alumina, alumina doped with 20 wt% ceria and ceria have bustion of longer hydrocarbons. However, due to high been prepared, characterized and examined for net-lean global warming potential, methane emissions should be methane oxidation. In particular, the activity and selectivity minimized from the exhaust to be an environmentally were investigated during rich/lean cycling of the feed. The appealing fuel [1]. Catalytic oxidation of methane is still a ceria content is found to influence both the general and the challenge, especially at low temperatures. Palladium is instantaneous activity responses. The results indicate that among the most active catalysts for methane oxidation [2, the active phase of palladium changes between reduced and 3] and the addition of ceria to the catalyst has shown to oxidised Pd during the rich/lean cycling, and that the further improve the activity [4]. Ceria is reported to process is influenced by the presence of ceria. enhance the noble metal dispersion and promote both