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Highly Active and Thermally Stable Supported Pd@SiO 2 Core–Shell Catalyst for Catalytic Methane Combustion
Author(s) -
Pi Dong,
Li Wen Zhi,
Lin Qi Zhao,
Huang Qi Fu,
Hu Hui Qing,
Shao Chun Yu
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600006
Subject(s) - catalysis , chemisorption , x ray photoelectron spectroscopy , methane , thermal stability , materials science , catalytic combustion , phase (matter) , chemical engineering , inorganic chemistry , combustion , chemistry , nanomaterial based catalyst , organic chemistry , engineering
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.