Zhang, Y, Lou, D, Tan, P et al. (2 more authors) (2019) Emission reduction characteristics of a catalyzed continuously regenerating trap after-treatment system and its durability performance. Journal of Environmental Sciences, 84. pp. 166-173. ISSN 2336-1964
Abstract
The primary purpose of this study was to investigate the effect of a catalyzed continuously regenerating trap (CCRT) system composed of a diesel oxidation catalyst (DOC) and a catalyzed diesel particulate filter (CDPF) on the main gaseous and particulate emissions from an urban diesel bus, as well as the durability performance of the CCRT system. Experiments were conducted based on a heavy chassis dynamometer, and a laboratory activity test as well as X-ray photoelectron spectroscopy (XPS) test were applied to evaluate the changes of the aged CCRT catalyst. Results showed that the CCRT could reduce the CO by 71.5% and the total hydrocarbons (THC) by 88.9%, and meanwhile promote the oxidation of NO. However, the conversion rates for CO and THC dropped to 25.1% and 55.1%, respectively, after the CCRT was used for one year (~ 60,000 km), and the NO oxidation was also weakened. For particulate emissions, the CCRT could reduce 97.4% of the particle mass (PM) and almost 100% of the particle number (PN). The aging of the CCRT resulted in a reduced PM trapping efficiency but had no observable effect on the PN; however, it increased the proportion of nucleation mode particles. The activity test results indicated that the deterioration of the CCRT was directly relevant to the increase in the light-off temperatures of the catalyst for CO, C3H8 and NO2. In addition, the decreased concentrations of the active components Pt2+ and Pt4+ in the catalyst are also important factors in the CCRT deterioration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019, The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. 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 bus; Catalyzed continuously regenerating trap (CCRT); Emissions; Durability; Deterioration |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 01 Jul 2019 14:13 |
Last Modified: | 14 May 2020 00:38 |
Status: | Published |
Publisher: | Charles University in Prague |
Identification Number: | 10.1016/j.jes.2019.05.001 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147998 |