CeO2-MOX (M=La3+, Ca2+)改性Pd/g-Al2O3催化甲烷燃烧性能

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	CeO2-MOX (M=La3+, Ca2+)改性Pd/g-Al2O3催化甲烷燃烧性能
	孙鲲鹏
刊名	物理化学学报
	2008
卷号	24 期号:11 页码:2108-2113
关键词	CeO2-MOx solid solution Pd/γ-Al2O3 catalyst Catalytic methane combustion XRD Raman XPS CeO2-MOx固溶体 Pd/γ-Al2O3催化剂甲烷催化燃烧
ISSN号	1000-6818
通讯作者	肖利华
中文摘要	Solid solution CeO2-MOx (M=La3+, Ca2+) promoted Pd/γ-Al2O3 catalysts were prepared by a depositionprecipitation method. The structural properties were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The results showed that Mn+ ions incorporated into CeO2 lattice and solid solutions formed in Pd/γ-Al2O3-CeO2-MOx catalysts. The formation of solid solution was confirmed by the change in lattice parameters of CeO2 and the shift of 2θ angles as compared with pure CeO2. A strain formed in the O2- sub-lattice of CeO2 was revealed by Raman analyses, which decreased the intensity of the Raman-active band at around 463 cm-1 owing to the F2g symmetric stretching of Ce—O bond. The appearance of a new band at 615 cm-1 (in the case of Pd/γ-Al2O3-CeO2-CaO) and a shoulder at 320 cm-1 (in the case of Pd/γ-Al2O3-CeO2-La2O3) was also confirmed. Ionic Pdδ+ species were formed in the catalysts, which exhibited higher binding energies (0.5-0.6 eV higher for Pd 3d5/2) than that of normal PdO. The catalysts showed high activity and stability for low temperature methane combustion. 10% and 100% conversions of methane could be obtained at temperatures of 254 and 340 ℃, respectively, over Pd/γ-Al2O3-CeO2-La2O3 catalyst under an hourly space velocity of 50000 h-1.
学科主题	物理化学
收录类别	CSCD
语种	英语
公开日期	2012-11-09
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/1975]
专题	兰州化学物理研究所_OSSO国家重点实验室兰州化学物理研究所_绿色化学研究发展中心
推荐引用方式 GB/T 7714	孙鲲鹏. CeO2-MOX (M=La3+, Ca2+)改性Pd/g-Al2O3催化甲烷燃烧性能[J]. 物理化学学报,2008,24(11):2108-2113.
APA	孙鲲鹏.(2008).CeO2-MOX (M=La3+, Ca2+)改性Pd/g-Al2O3催化甲烷燃烧性能.物理化学学报,24(11),2108-2113.
MLA	孙鲲鹏."CeO2-MOX (M=La3+, Ca2+)改性Pd/g-Al2O3催化甲烷燃烧性能".物理化学学报 24.11(2008):2108-2113.