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题名: The effect of CeO2 and BaO on Pd catalysts used for lean-burn natural gas vehicles
作者: Zhang, Xiaoyu1;  Long, Enyan1;  Li, Yile1;  Zhang, Lijuan2;  Guo, Jiaxiu3;  Gong, Maochu1;  Chen, Yaoqiang1
关键词: CeO2 ;  BaO ;  Modified Al2O3 ;  Lean-burn natural gas vehicles (NGVs) catalysts ;  Pd-support interaction
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2009-08-04
DOI: 10.1016/j.molcata.2009.03.028
卷: 308, 期:1-2, 页:73-78
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Palladium catalysts supported on Al2O3 doped by BaO and/or CeO2 were prepared by impregnation method. Various techniques, including N-2 adsorption (Brunauer-Emmet-Teller method; BET). X-ray diffraction (XRD), CO-chemisorption, H-2-temperature-programmed reduction (H-2-TPR) and X-ray photoelectron spectroscopy (XPS), Were employed to characterize the effect of BaO and/or CeO2 on the physicochemical properties of prepared catalysts. Catalytic activities for methane and CO oxidation were evaluated in a gas mixture Simulated the exhaust from lean-burn natural gas vehicles (NGVs). The BET results showed that the Supports possessed high specific Surface area, suitable pore Volume and pore size distribution. The activity results indicated that the catalyst modified by CeO2 showed the best performance for methane and CO removal, and the one modified by both BaO and CeO2 the worst. CO-chemisorption and H-2-TPR results indicated that the addition of ceria or barium alone Could increase the dispersion of palladium and improve the reducibility of catalysts. The results of XPS showed that BaO increased the electron density around PdO while CeO2 activated the lattice oxygen and increased the content of oxygen species on the Surface of catalysts. When BaO and CeO2 were added Simultaneously, their respective potential effect was restrained by each other resulting in the decrease of catalytic activity. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED PALLADIUM CATALYSTS ;  METHANE EMISSIONS ABATEMENT ;  BIOFUEL COMBUSTION SYSTEMS ;  LOW-TEMPERATURE ;  COMPLETE OXIDATION ;  STRUCTURAL-PROPERTIES ;  EXHAUST ;  HYDROGENATION ;  BEHAVIOR ;  CERIA
语种: 英语
WOS记录号: WOS:000268359900010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141254
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Sichuan Univ, Key Lab Green Chem & Technol, Minist Educ, Coll Chem, Chengdu 610064, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
3.Sichuan Univ, Coll Architecture & Environm, Chengdu 610064, Peoples R China

Recommended Citation:
Zhang, Xiaoyu,Long, Enyan,Li, Yile,et al. The effect of CeO2 and BaO on Pd catalysts used for lean-burn natural gas vehicles[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2009,308(1-2):73-78.
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