Al₂O₃ supported hybrid Pd-CeO₂ colloidal spheres and its enhanced catalytic performances for methane combustion

Xinwei Yang¹，Chenhao Du²，Yanglong Guo¹，Yun Guo¹，Li Wang¹，Yunsong Wang¹，Wangcheng Zhan¹

1. Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology2. Sinopec Shanghai Research Institute of Petrochemical Technology

摘 要：Fabrication of novel nano-catalyst with improved activity and stability has been a hot topic in heterogeneous catalysis. Herein a novel approach was designed to synthesize Pd-CeO₂ colloidal assembled spheres（CASs） in one-pot fashion. The Pd clusters were encompassed by the CeO₂ nanocrystals with a high dispersity. Based on this hybrid structure, the Pd/ceria interface area can be greatly improved. After Pd-CeO₂ CASs was supported on γ-Al₂O₃, its catalytic activity for CH₄ combustion was evaluated. The result shows that Al₂O₃ supported Pd-CeO₂ CASs exhibits an improved catalytic activity and stability,compared to the Pd/CeO₂ catalyst prepared by impregnation method. The results of several characterization techniques indicate that the enhanced catalytic activity of Al₂O₃ supported Pd-CeO₂ CASs can be attributed to the more interfacial Pd-O-Ce species and the more surface active oxygen species.

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