Abstract
The high NO2/NOX ratio in the after-treatment system is beneficial to its performance and achieved by NO catalytic conversion in diesel oxidation catalyst (DOC) located upstream (CRDPF), catalytic DPF (CDPF), or a combination of both (CCDPF). In order to effectively control the emission of particulates and nitrogen oxides, various types of diesel particulate filter models are established to compare NO2 catalytic formation, consumption, and efflux. The results show that the catalytic performance of NO conversion is limited by mass transfer in DOC catalytic coating, while it is almost non-existent in CDPF. At low temperature, the passive regeneration of CDPF is slower than that of CRDPF, but as the temperature increases, the passive regeneration speed of CDPF will exceed that of CRDPF. CCDPF is the most effective for the NO2 catalytic formation, consumption, and efflux in the hot-start and high-speed cycle and thereby is conducive to improve the performance of the diesel particulate filter and downstream selective catalytic reduction.
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Abbreviations
- a c :
-
geometric surface area [m2·m−3]
- c p :
-
specific heat capacity [J·(kg·K) −1]
- d :
-
channel diameter [m]
- Dw:
-
effective diffusion coefficient [m2·s−1]
- E :
-
activation energy [J·mol−1]
- K :
-
number of components
- k :
-
reaction rate constant [s−1]
- km:
-
mass transfer coefficient [m·s−1]
- h :
-
heat transfer coefficient [W·m−2·K−1]
- L :
-
channel length [m]
- MC :
-
molar mass of carbon [kg·mol−1]
- MNO2 :
-
molar mass of species NO2 [kg·mol−1]
- P :
-
pressure [Pa]
- r :
-
reaction rate [mol·s−1m−3]
- S c :
-
specific surface of the particulate [m2·m−3]
- t :
-
time[s]
- T :
-
temperature [K]
- v :
-
gas velocity[m·s−1]
- v W :
-
wall velocity [m·s−1]
- V :
-
volume [m3]
- y :
-
mass fraction
- λ :
-
thermal conductivity [W·m−1·K−1]
- ρ :
-
density [kg·m−3]
- ζ :
-
sum
- γ :
-
stoichiometric coefficient
- ε S :
-
porosity
- 0:
-
channel entrance
- 1:
-
inlet channel
- 2:
-
outlet channel
- i:
-
species index
- j:
-
reaction index
- g:
-
gas
- W:
-
Washcoat
- S:
-
solid
- CDPF:
-
catalytic diesel particulate filter
- CCDPF:
-
catalytic diesel particulate filter with diesel oxidation catalyst located upstream
- CRDPF:
-
continuous regenerative diesel particulate filter
- DOC:
-
diesel oxidation catalyst
- DPF:
-
diesel particulate filter
- PM:
-
particulate matter
- SCR:
-
selective catalytic reduction
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GJ developed the idea for the study; JG designed the experiment; CZ, SW, JT, JL, and YZ did the analyses; and CZ was a major contributor in writing the manuscript. All authors read and approved the final manuscript.
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Zhong, C., Gong, J., Wang, S. et al. NO2 catalytic formation, consumption, and efflux in various types of diesel particulate filter. Environ Sci Pollut Res 28, 20034–20044 (2021). https://doi.org/10.1007/s11356-020-11870-1
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DOI: https://doi.org/10.1007/s11356-020-11870-1