Soot Structure and Reactivity Analysis by Raman Microspectroscopy,Temperature-Programmed Oxidation, and High-Resolution Transmission Electron Microscopy

Markus Knauer; Manfred E. Schuster; Dangsheng SuRobert SchloglReinhard NiessnerNatalia P. Ivleva

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Soot Structure and Reactivity Analysis by Raman Microspectroscopy,Temperature-Programmed Oxidation, and High-Resolution Transmission Electron Microscopy

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Raman microspectroscopy (RM), temperature-programmed oxidation (TPO), high-resolution transmissionelectron microscopy (HRTEM), and electron energy loss spectroscopy (EELS) were combined to getcomprehensive information on the relationship between structure and reactivity of soot in samples of sparkdischarge (GfG), heavy duty engine diesel (EURO VI and IV) soot, and graphite powder upon oxidation byoxygen at increasing temperatures. GfG soot and graphite powder represent the higher and lower reactivitylimits. Raman microspectroscopic analysis was conducted by determination of spectral parameters using afive band fitting procedure (G, D1-D4) as well as by evaluation of the dispersive character of the D mode.The analysis of spectral parameters shows a higher degree of disorder and a higher amount of molecularcarbon for untreated GfG soot samples than for samples of untreated EURO VI and EURO IV soot. Thestructural analysis based on the dispersive character of the D mode revealed substantial differences in orderingdescending from graphite powder, EURO IV, VI to GfG soot. HRTEM images and EELS analysis of EUROIV and VI samples indicated a different morphology and a higher structural order as compared to GfG sootin full agreement with the Raman analysis. These findings are also confirmed by the reactivity of soot duringoxidation (TPO), where GfG soot was found to be the most reactive and EURO IV and VI soot samplesexhibited a moderate reactivity.

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2009年第50期|13871-13880|共10页
作者
Markus Knauer; Manfred E. Schuster; Dangsheng SuRobert SchloglReinhard NiessnerNatalia P. Ivleva;
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作者单位

Technische UniVersitat Munchen, Institute of Hydrochemistry, Chair for Analytical Chemistry, Marchioninistr. 17, D-81377 Munich, Germany,;

Fritz-Haber-Institut der Max-Planck-Gesellschaft, Department of Inorganic Chemistry, Faradayweg 4-6, D-14195 Berlin, Germany;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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Structure; Oxidation; Microscopy;

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Soot Structure and Reactivity Analysis by Raman Microspectroscopy,Temperature-Programmed Oxidation, and High-Resolution Transmission Electron Microscopy

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