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Abstract
Three-dimensional (3D) mesoporous tetragonal MnO2 (MnO2-SBA16 and MnO2-KIT6) and cubic Co3O4 (Co3O4-SBA16 and Co3O4-KIT6) with high surface areas (102–184m2/g) were, respectively prepared using the nanocasting strategy with SBA-16 and KIT-6 as templates. The KIT-6- and SBA-16-derived samples displayed 3D ordered and wormhole-like mesoporous structures, respectively. The oxygen adspecies concentration and low-temperature reducibility decreased in the orders of MnO2-KIT6>MnO2-SBA16>MnO2-bulk and of Co3O4-KIT6>Co3O4-SBA16>Co3O4-bulk, in agreement with their catalytic performance sequences. The porous MnO2 catalysts (T90%=217–220°C) outperformed the porous Co3O4 catalysts (T90%=233–240°C) for toluene oxidation, but the latter (T90%=129–132°C) were superior to the former (T90%=158–178°C) in catalytic activity for CO oxidation. It is concluded that the high surface area and oxygen adspecies concentrations, good low-temperature reducibility, and high-quality 3D ordered mesoporous architecture accounted for the excellent catalytic performance of MnO2-KIT6 and Co3O4-KIT6.
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