Abstract
Three-dimensionally ordered macroporous CeO2 (3DOM CeO2) and its supported Pd@Co (CoxPd/3DOM CeO2, x (Co/Pd molar ratio)=2.4–13.6) nanocatalysts were prepared using the polymethyl methacrylate-templating and modified polyvinyl alcohol-protected reduction methods, respectively. The Pd@Co particles displayed a core-shell (core: Pd; shell: Co) structure with an average size of 3.5–4.5nm and were well dispersed on the surface of 3DOM CeO2. The CoxPd/3DOM CeO2 samples exhibited high catalytic performance and super stability for methane oxidation, with the Co3.5Pd/3DOM CeO2 sample showing the highest activity (T90%=480°C at space velocity of 40,000mL/(gh) and excellent stability in the temperature range 400–800°C. The apparent activation energies (58–73kJ/mol) obtained over CoxPd/3DOM CeO2 were much lower than those (104–112kJ/mol) over Co/3DOM CeO2 and 3DOM CeO2 for methane oxidation, with the Co3.5Pd/3DOM CeO2 sample possessing the lowest apparent activation energy (58kJ/mol). It is concluded that the excellent catalytic performance of Co3.5Pd/3DOM CeO2 was associated with its good abilities to adsorb oxygen and methane as well as the unique core-shell structure of CoPd nanoparticles.
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