Citation:
LU Nan, WU Zhi-wei, LEI Li-jun, QIN Zhang-feng, ZHU Hua-qing, LUO Li, FAN Wei-bin, WANG Jian-guo. Catalytic combustion of lean methane over a core-shell structured Pd-Co3O4@SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology,
;2015, 43(9): 1120-1127.
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A core-shell structured Pd-Co3O4@SiO2 catalyst was prepared by a simple self-assemble method and used in lean methane combustion. The results of catalytic tests indicate that the core-shell Pd-Co3O4@SiO2 catalyst exhibits high activity in lean methane combustion and superior stability at high temperature. The results of TEM, XRD, and H2-TPR characterization suggest that the high activity of Pd-Co3O4@SiO2 is mainly ascribed to the strong interaction between CoOx and PdO species inside the SiO2 shell. Meanwhile, as the active Pd and CoOx species in Pd-Co3O4@SiO2 are enshielded in the core-shell structure, which is effective to protect the active phase from sintering at high temperature, the core-shell structured Pd-Co3O4@SiO2 catalyst is thus far superior in thermal stability against high temperature to the supported Pd/Co3O4@SiO2 and Pd/Co3O4-SiO2 catalysts.
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