Oxidation of methane over Pd/mixed oxides for catalytic combustion |
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| Authors: | Hardiyanto Widjaja Koshi Sekizawa Koichi Eguchi Hiromichi Arai |
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| Affiliation: | Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasugakoen, Kasuga Fukuoka 816-8580 Japan |
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| Abstract: | Palladium catalysts supported on mixed oxides (Pd/Al2O3–MOx; M=Co, Cr, Cu, Fe, Mn, and Ni) were investigated for the low-temperature catalytic combustion of methane. Although the surface area decreased with increasing NiO in Pd/mAl2O3–nNiO, Pd/Al2O3–36NiO demonstrated an excellent activity due to the small particle size of palladium. Also, the catalytic activity strongly depended on the composition of the support. Temperature-programmed desorption of oxygen revealed that the catalytic activity in the low-temperature region depends on the adsorption state of oxygen on palladium. The activity was enhanced when the amount of adsorbed oxygen increased. In-situ XRD analysis indicated that the PdO phase was thermally stabilized on Pd/Al2O3–36NiO. |
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| Keywords: | Catalytic combustion Catalytic ignition Temperature-programmed oxygen desorption Mixed oxides supports based on alumina Supported PdO catalysts |
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