Liu, Y orcid.org/0000-0002-9367-3532, Wu, S, Fan, C et al. (3 more authors) (2023) Variations in surface functional groups, carbon chemical state and graphitization degree during thermal deactivation of diesel soot particles. Journal of Environmental Sciences, 124. pp. 678-687. ISSN 1001-0742
Abstract
The thermal deactivation of diesel soot particles exerts a significant influence on the control strategy for the regeneration of diesel particulate filters (DPFs). This work focused on the changes in the surface functional groups, carbon chemical state, and graphitization degree during thermal treatment in an inert gas environment at intermediate temperatures of 600°C, 800°C, and 1000°C and explore the chemical species that were desorbed from the diesel soot surface during thermal treatment using a thermogravimetric analyser coupled with a gas-chromatograph mass spectrometer (TGA-GC/MS). The surface functional groups and carbon chemical state were characterized using Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The graphitization degree was evaluated by means of Raman spectroscopy (RS). The concentrations of aliphatic C–H, C–OH, C=O, and O–C=O groups are reduced for diesel soot and carbon black when increasing the thermal treatment temperature, while the sp2/sp3 hybridized ratio and graphitization degree enhance. These results provide comprehensive evidence of the decreased reactivity of soot samples. Among oxygenated functional groups, the percentage reduction during thermal treatment is the largest for the O–C=O groups owing to its worst thermodynamic stability. TGA-GC/MS results show that the aliphatic and aromatic chains and oxygenated species would be desorbed from the soot surface during 1000°C thermal treatment of diesel soot.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. This is an author produced version of an article, published in Journal of Environmental Sciences. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Diesel soot particles; Surface functional groups; Carbon chemical state; Graphitization degree; Thermal deactivation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > Institute for Transport Studies (Leeds) > ITS: Spatial Modelling and Dynamics (Leeds) |
Funding Information: | Funder Grant number EU - European Union 815189 |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Jan 2022 16:15 |
Last Modified: | 18 Oct 2024 14:41 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jes.2022.01.007 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:182605 |