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Effect of cobalt promoter on structure and properties of lean-burn NOx trap Pt/Ba-Al-O
其他题名Co 助剂对稀燃NOx 阱Pt/ Ba2Al2O 结构和性能的影响
Li, XA; Meng, M; Lin, PY; Chen, JF; Fu, YL; Yu, SM; Xie, YI; Hu, TD; 谢亚宁,胡天斗
2002
发表期刊CHINESE JOURNAL OF CATALYSIS
卷号23期号:5页码:417-420
通讯作者Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
文章类型Article
摘要Under lean-burn conditions, the NO, trap Pt/Ba-Al-O can store NO, as nitrates or nitrites. Successive sequences of lean and rich operating periods provide a high efficiency for NO, reduction. On addition of the Co promoter, the NO, storage capacity of the trap is improved remarkably. In this paper, the NO, trap Pt/Co-Ba-Al-O with an Al:Ba:Co molar ratio of 32:2: 1 and a Pt:Co-Ba-Al-O mass ratio of 1.0% was prepared by the coprecipitation-impregnation method. X-ray diffraction, X-ray absorption near edge structure and extended Xray absorption fine structure were used to characterize the microstructure of the samples. After calcination at 800degreesC I cobalt species react with alumina to form CoAl2O4, in which cobalt is present in the form of tetrahedrally-coordinated Co2+ ions. The well-dispersed CoAl2O4 phase can promote the conversion of NO to NO2 through reactions of 2Co(2) + 1/2O(2) --> 2Co(3) + [O2-] and 2Co(3+) + [O2-] + NO --> 2Co(2+) + NO2 under lean-burn conditions. This results in an enhancement of the NO, storage capacity. Pt species mainly exist as well-dispersed small atomic clusters. Compared with the sample Pt/Ba-Al-O, Pt/Co-Ba-Al-O shows a higher alumina dispersion and the strung interaction between Pt species and supports is inhibited. This leads to the adequate distribution of fine-grained platinum species over the NO, trap and is favorable for NO, storage. A NO, storage capacity of 372 mumol/g is obtained over Pt/Co-Ba-Al-O at 200 degreesC, which is about 21.6% higher than that over Pt/Ba-Al-O.
关键词nitrogen oxide trap platinum supported catalyst cobalt promoter X-ray absorption fine structure
学科领域Chemistry; Engineering
研究领域[WOS]Chemistry ; Engineering ; Chemistry ; Engineering
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语种英语
研究领域[WOS]Chemistry ; Engineering ; Chemistry ; Engineering
WOS类目Chemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS记录号WOS:000178634300008
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237391
专题加速器中心
作者单位中国科学院高能物理研究所
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Li, XA,Meng, M,Lin, PY,et al. Effect of cobalt promoter on structure and properties of lean-burn NOx trap Pt/Ba-Al-O[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(5):417-420.
APA Li, XA.,Meng, M.,Lin, PY.,Chen, JF.,Fu, YL.,...&谢亚宁,胡天斗.(2002).Effect of cobalt promoter on structure and properties of lean-burn NOx trap Pt/Ba-Al-O.CHINESE JOURNAL OF CATALYSIS,23(5),417-420.
MLA Li, XA,et al."Effect of cobalt promoter on structure and properties of lean-burn NOx trap Pt/Ba-Al-O".CHINESE JOURNAL OF CATALYSIS 23.5(2002):417-420.
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