화학공학소재연구정보센터
Materials Research Bulletin, Vol.96, 2-9, 2017
Catalytically active Co3O4 hybrid microstructures and their morphology evolution induced by ceria
Mixed metal oxides with hybrid structures often show synergistic effects and thus much better catalytic properties than their single components. We present here the synthesis of Ce/Co mixed oxalates via a facile co-precipitation method, and the following calcination process resulted in the final CeO2/Co3O4 hybrid microstructures. Then the systematical characterizations were conducted to study their structure evolution and composition-dependent properties on catalytic CO oxidation. The results show that the hybrids of CeO2/Co3O4 were composed of 5 nm sized CeO2 and 20 nm sized Co3O4. While increasing the feeding amount of Ce, the morphologies of the as-obtained CeO2/Co3O4 hybrids changed from the flower-like microstructures to the hot dog-like ones, and finally to the sheet-like ones. After catalytic tests, it was found that the CeO2/Co3O4 hybrids show different catalytic activities by varying the molar ratios of Ce/Co (pure Co for Co-oxalate, Ce/Co = 1/19 for Ce-1/Co-19-oxalate, Ce/Co = 1/9 for Ce-1/Co-9-oxalate, Ce/Co = 3/7 for Ce-3/Co-7-oxalate, Ce/Co = 5/5 for Ce-5/Co-5-oxalate, pure Ce for Ce-oxalate). Among these samples, Ce/Co = 1:19, which has a higer pore volume performed the optimal catalytic property compared to the others. (C) 2016 Elsevier Ltd. All rights reserved.
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