Construction of a Pd(PdO)/Co 3 O 4 @SiO 2 core–shell structure for efficient low-temperature methane combustion

作者：Yongde Ma, Shusheng Li, Tianhua Zhang, Yangyu Zhang, Xiuyun Wang, Yihong Xiao, Yingying Zhan, Lilong Jiang · 发表于：Nanoscale · 年份：2021 · DOI：10.1039/d0nr08723h · 被引用次数：42 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Catalysts for Methane Reforming

Catalytic combustion is a promising way to remove trace amounts of CH4 to alleviate serious environmental concerns. However, the reactivity of a catalyst at low temperature is usually limited because of the difficulty to activate the C-H bond of methane. Herein, we design a Pd(PdO)/Co3O4@SiO2 bimetallic oxide core-shell catalyst which shows much higher activity in the methane combustion reaction compared with Pd(PdO)/SiO2 and Co3O4@SiO2 catalysts without a core-shell structure. The T50% and T90% of Pd(PdO)/Co3O4@SiO2 are 357 °C and 445 °C, respectively, which decrease by 67 °C and 55 °C in comparison with those of Pd(PdO)/SiO2. Extensive characterization demonstrates that the bimetallic oxide core-shell structure can effectively enhance the metal interaction between Pd and Co, which can weaken the strength of the Co-O bond in Pd(PdO)/Co3O4@SiO2. The weakening of the Co-O bond could promote the release of more lattice oxygen species to participate in the C-H breaking, resulting in superior catalytic performance in methane combustion at low temperature.