催化作用
化学吸附
X射线光电子能谱
甲烷
热稳定性
材料科学
催化燃烧
相(物质)
化学工程
无机化学
燃烧
化学
纳米材料基催化剂
物理化学
有机化学
工程类
作者
Dong Pi,Wen Zhi Li,Qizhao Lin,Qifu Huang,Hui Qing Hu,Chun Yu Shao
标识
DOI:10.1002/ente.201600006
摘要
Abstract A series of Pd‐based core–shell catalysts (Pd@SiO 2 , Pd@CeO 2 , and Pd@ZrO 2 ) supported on Si‐modified Al 2 O 3 were prepared for the catalytic combustion of lean methane. Pd@SiO 2 exhibited slightly lower catalytic activity than Pd@CeO 2 and higher catalytic activity than Pd@ZrO 2 in dry conditions; however, Pd@SiO 2 had the highest catalytic activity among the three catalysts in the presence of high concentrations of water vapor. Furthermore, the Pd@SiO 2 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‐Al 2 O 3 catalyst. XRD and X‐ray photoelectron spectroscopy results indicated that a balanced mixed phase of PdO x /Pd 0 is the main active phase of these Pd‐based catalysts.
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