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Self-sustained combustion of CO with transient changes and reaction mechanism over CuCe0.75Zr0.25O delta powder for honeycomb ceramic catalyst

文献类型：期刊论文

作者Kang RN(康润宁)4,5; Wei XL(魏小林)3,4,5; Ma PD(马盼东)2,5; Bin F(宾峰)3,5; He JY1,5; Hao QL2; Dou BJ2
刊名FUEL
出版日期2020-03-01
卷号263页码:9
关键词CuCe0.75Zr0.25O delta honeycomb catalyst Carbon monoxide Self-sustained combustion Reactant concentration Transient changes Competitive adsorption
ISSN号0016-2361
DOI10.1016/j.fuel.2019.116637
通讯作者Bin, Feng(binfeng@imech.ac.cn) ; Dou, Baojuan(bjdou@tust.edu.cn)
英文摘要A CuCe0.75Zr0.25O delta catalyst was prepared by the sol-gel method and successfully coated on honeycomb ceramic (HC) carrier. The activity of CuCe0.75Zr0.25O delta/HC was determined by the CO-TPO + FLIR, with the results performing that the critical condition for CO self-sustained combustion is 3 vol% CO + 3 vol% O-2/N-2 at 0.5 L/min. As the CO concentration increases from 1 vol% CO to 3 vol% CO, the induction process (< T-15) shifts toward a slower CO conversion, while the light-off process (> T-15) shifts to rapid ignition with a transient change for the CO oxidation reaction. The furnace temperature for CO self-sustained combustion decreases with increasing the CO and O-2 concentrations. Upon increasing the CO2 concentration, however, furnace temperature is needed to increase and realize CO complete conversion. The thermal stability test combined with SEM + EDX results indicate that the CuCe0.75Zr0.25O delta/HC retains an excellent thermal stability after a 200 h, and the high-temperature region remains at 225 +/- 1 degrees C during the CO self-combustion reaction. The activity of catalyst is reduced slightly after the 200 h test because of the carbon deposition on the catalyst surface, but such a slight deactivation can be eliminated by the air oxidation method. In situ IR results show a competitive adsorption of CO/O-2 and CO2 on the Cu-Ce active sites, indicating that the addition of gaseous CO2 performs an inhibition of CO oxidation. CO preferentially adsorbs linearly at Cu+ sites to form carbonyls that react with lattice oxygen to produce CO2 to release, which can be ascribed to M-K mechanism. The L-H mechanism is less important, which involves the relatively weak reaction of adsorbed CO and adsorbed oxygen on the Cu-Ce active sites to form carbonate species.
分类号一类
WOS关键词CUO-CEO2 CATALYSTS ; CARBON-MONOXIDE ; OXIDATION ; OXIDE ; PERFORMANCE ; PLATINUM ; CEO2
资助项目National Natural Science Foundation of China[51776216] ; National Natural Science Foundation of China[51736010] ; Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences[XDA21040500]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:000504834400111
资助机构National Natural Science Foundation of China ; Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者Bin, Feng ; Dou, Baojuan
源URL[http://dspace.imech.ac.cn/handle/311007/81589]  
专题力学研究所_高温气体动力学国家重点实验室
作者单位1.Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China
2.Tianjin Univ Sci & Technol, Coll Marine & Environm Sci, Tianjin 300457, Peoples R China;
3.Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China;
4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
5.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Kang RN,Wei XL,Ma PD,et al. Self-sustained combustion of CO with transient changes and reaction mechanism over CuCe0.75Zr0.25O delta powder for honeycomb ceramic catalyst[J]. FUEL,2020,263:9.
APA 康润宁.,魏小林.,马盼东.,宾峰.,He JY.,...&Dou BJ.(2020).Self-sustained combustion of CO with transient changes and reaction mechanism over CuCe0.75Zr0.25O delta powder for honeycomb ceramic catalyst.FUEL,263,9.
MLA 康润宁,et al."Self-sustained combustion of CO with transient changes and reaction mechanism over CuCe0.75Zr0.25O delta powder for honeycomb ceramic catalyst".FUEL 263(2020):9.

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来源：力学研究所

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