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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.
Source PublicationProceedings of The Combustion Institute
2015
Volume35Issue:2Pages:2241-2248
ISSN1540-7489
AbstractThe 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.
KeywordSoot Nitrous Oxide Catalytic Combustion Perovskite Catalyst
Subject AreaThermodynamics ; Energy & Fuels ; Engineering
DOI10.1016/j.proci.2014.08.028
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000348048800127
WOS KeywordDIESEL SOOT ; SURFACE-CHEMISTRY ; MIXED OXIDES ; OXIDATION ; TEMPERATURE ; COMPLEX ; NH3
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
Funding OrganizationThis study was supported by the National Key Basic Research and Development Program (2013CB228506) and the National Natural Science Foundation of China (No. 51206119).
DepartmentLHD高效洁净燃烧(CPCR)
Classification一类
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49590
Collection高温气体动力学国家重点实验室
Corresponding AuthorSong, CL (reprint author), Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China.
Recommended Citation
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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