Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst

doi:10.1016/j.proci.2014.08.028

	Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst
	Bin F(宾峰); Song CL; Lv G; Li XD; Cao XF; Song JO; Wu SH; Song, CL (reprint author), Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China.
发表期刊	Proceedings of The Combustion Institute
	2015
卷号	35 期号:2 页码:2241-2248
ISSN	1540-7489
摘要	The combustion of diesel soot in NO + O-2/He atmospheres was investigated by temperature-programmed oxidation (TPO), X-ray photoelectron spectroscopy (XPS), and in-situ diffuse reflectance Fourier transform (DRIFT) technology, with the aim to demonstrate the participation of nitric oxide species and surface carbon-oxygenated complexes in the process. According to the TPO results, two main adsorption periods for nitric oxide species were observed: one was from 50 to about 180 degrees C and the other occurred in the temperature range of 180-400 degrees C. The DRIFT results indicated that the first adsorption period was mainly associated with weakly adsorbed NO, bidentate nitrite and unidentate nitrate, monodentate nitrate, chelating nitrate and bridging nitrate, while the second uptake was related to nitrite and free nitrate species. Based on the XPS and DRIFT results, possible reaction processes for the NOx-soot combustion are proposed based on the Langmuir-Hinshelwood mechanism. First, the carbon-oxygenated groups, including carboxyls, lactones, and anhydrides were formed at free carbon sites by the oxidation of dissociative nitrates. Such moieties were so stable that they could not be further oxidized, even at 400 degrees C, without the presence of a catalyst. Second, the adsorption of NO + O-2 resulted in the formation of nitrates on the MnOx surface of the catalyst. Then, the surface-activated nitrates, with activity decreasing in the order: chelating nitrates > bridging nitrates > monodentate nitrates > free ionic nitrates, further oxidized these carbon-oxygenated complexes with subsequent release of CO2, NO and N-2. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
关键词	Soot Nitrous Oxide Catalytic Combustion Perovskite Catalyst
学科领域	Thermodynamics ; Energy & Fuels ; Engineering
DOI	10.1016/j.proci.2014.08.028
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000348048800127
关键词[WOS]	DIESEL SOOT ; SURFACE-CHEMISTRY ; MIXED OXIDES ; OXIDATION ; TEMPERATURE ; COMPLEX ; NH3
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
项目资助者	This study was supported by the National Key Basic Research and Development Program (2013CB228506) and the National Natural Science Foundation of China (No. 51206119).
课题组名称	LHD高效洁净燃烧(CPCR)
论文分区	一类
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/49589
专题	高温气体动力学国家重点实验室
通讯作者	Song, CL (reprint author), Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China.
推荐引用方式 GB/T 7714	Bin F,Song CL,Lv G,et al. Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst[J]. Proceedings of The Combustion Institute,2015,35,2,:2241-2248.
APA	Bin F.,Song CL.,Lv G.,Li XD.,Cao XF.,...&Song, CL .(2015).Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst.Proceedings of The Combustion Institute,35(2),2241-2248.
MLA	Bin F,et al."Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst".Proceedings of The Combustion Institute 35.2(2015):2241-2248.

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