Synergy effects analysis on CDPF regeneration performance enhancement and NOx concentration reduction of NH3–SCR over Cu–ZSM–5

To improve the synergy effects of post-processing equipment and decrease diesel engine emissions, the after-treatment synergy model is established to analyze the soot regeneration combustion of catalytic diesel particulate filter (CDPF) passive and active regeneration and downstream selective cataly...

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Bibliographic Details
Published in:Energy (Oxford) 2021-09, Vol.230, p.120814, Article 120814
Main Authors: Zhong, Chao, Tan, Jiqiu, Zuo, Hongyan, Wu, Xin, Wang, Shaoli, Liu, Junan
Format: Article
Language:English
Subjects:
Active regeneration
Ammonia
Catalysts
Catalytic diesel particulate filter
Chemical reduction
Conversion
Cu–ZSM–5
Diesel
Diesel engines
Fluid filters
NH3–SCR
Nitric oxide
Nitrogen dioxide
Nitrogen oxide conversion
Nitrogen oxides
Oxidation
Passive regeneration
Performance enhancement
Photochemicals
Platinum
Post-processing
Regeneration
Selective catalytic reduction
Soot
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Summary:To improve the synergy effects of post-processing equipment and decrease diesel engine emissions, the after-treatment synergy model is established to analyze the soot regeneration combustion of catalytic diesel particulate filter (CDPF) passive and active regeneration and downstream selective catalytic reduction (SCR) by NH3 (NH3–SCR) over Cu–ZSM–5. Kinetic models of nitric oxide oxidation on platinum-based catalyst, passive and active regeneration of CDPF and nitrogen oxide conversion in SCR are verified. Results show that the CDPF passive regeneration weakens the SCR performance with small inlet NO2/NOX ratio while enhances the SCR performance with large inlet NO2/NOX ratio, and active regeneration deteriorates SCR performance. Of all the factors, except temperature, the SCR NOX conversion varies with the NO2 concentration at the outlet of the CDPF during the CDPF passive regeneration, and the CDPF outlet oxygen concentration mainly affects downstream SCR performance under active regeneration conditions. [Display omitted] •An after-treatment synergy model of post-processing equipment is established.•Kinetic models of nitric oxide oxidation and soot regeneration are verified.•Soot regeneration combustion of the post-processing equipment are investigated.•Key parameters affecting soot regeneration performance are summarized.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2021.120814