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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents



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ID: 434630.0, Fritz-Haber-Institut / Inorganic Chemistry
Soot Structure and Reactivity Analysis by Raman Microspectroscopy, Temperature-Programmed Oxidation, and High-Resolution Transmission Electron Microscopy
Authors:Knauer, Markus; Schuster, Manfred E.; Su, Dang Sheng; Schlögl, Robert; Niessner, Reinhard; Ivleva, Natalia P.
Language:English
Research Context:Carbon
Date of Publication (YYYY-MM-DD):2009-11-09
Title of Journal:Journal of Physical Chemistry A
Journal Abbrev.:J. Phys. Chem. A
Volume:113
Issue / Number:50
Start Page:13871
End Page:13880
Copyright:© 2009 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Raman Microspectroscopy (RM), Temperature Programmed Oxidation (TPO), High Resolution Transmission Electron Microscopy (HRTEM) and Electron Energy Loss Spectroscopy (EELS) were combined to get comprehensive information on the relationship between structure and reactivity of soot in samples of spark discharge (GfG), heavy duty engine diesel (EURO VI and IV) soot and Graphite powder upon oxidation by oxygen at increasing temperatures. GfG soot and Graphite powder represent the higher and lower reactivity limits. Raman microspectroscopic analysis was conducted by determination of spectral parameters using a five 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 molecular carbon for untreated GfG soot samples than for samples of untreated EURO VI and EURO IV soot. The structural analysis based on the dispersive character of D mode revealed substantial differences in ordering descending from Graphite powder, EURO IV, VI to GfG soot. HRTEM images and EELS analysis of EURO IV and VI samples indicated a different morphology and a higher structural order as compared to GfG soot in full agreement with the Raman analysis. These findings are also confirmed by the reactivity of soot during oxidation (TPO), where GfG soot was found to be the most reactive and EURO IV and VI soot samples exhibited a moderate reactivity.
Free Keywords:Soot structure; soot reactivity; Raman Microspectroscopy (RM); Temperature Programmed Oxidation (TPO); High Resolution Transmission Electron Microscopy (HRTEM); Electron Energy Loss Spectroscopy (EELS)
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Technische Universität München, Institute of Hydrochemistry, Chair for Analytical Chemistry, Marchioninistr. 17, D-81377 Munich, Germany
Identifiers:URL:http://dx.doi.org/10.1021/jp905639d [only for subscriber]
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