Highly Active and Thermally Stable Supported Pd@SiO2 Core-Shell Catalyst for Catalytic Methane Combustion

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• 作者：Dong Pi ; Dr. Wen Zhi Li ; Prof. Qi Zhao Lin ; Qi Fu Huang ; Hui Qing Hu and Chun Yu Shao
• 刊名：Energy Technology
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：4
• 期：8
• 页码：943-949
• 全文大小：1477K
• ISSN：2194-4296

文摘

A series of Pd-based core–shell catalysts (Pd@SiO₂, Pd@CeO₂, and Pd@ZrO₂) supported on Si-modified Al₂O₃ were prepared for the catalytic combustion of lean methane. Pd@SiO₂ exhibited slightly lower catalytic activity than Pd@CeO₂ and higher catalytic activity than Pd@ZrO₂ in dry conditions; however, Pd@SiO₂ had the highest catalytic activity among the three catalysts in the presence of high concentrations of water vapor. Furthermore, the Pd@SiO₂ catalyst showed good thermal stability and resistivity to water poisoning. CO chemisorption and TEM results demonstrated that the core–shell structure could help in the stabilization of the active phase compared to the uncoated Pd/Si-Al₂O₃ catalyst. XRD and X-ray photoelectron spectroscopy results indicated that a balanced mixed phase of PdO_x/Pd⁰ is the main active phase of these Pd-based catalysts.