Heterogeneous mechanism of NOx-assisted soot oxidation in the passive regeneration of a bench-scale diesel particulate filter catalyzed with nanostructured equimolar ceria-praseodymia

2019 ◽  
Vol 583 ◽  
pp. 117136 ◽  
Author(s):  
Tahrizi Andana ◽  
Marco Piumetti ◽  
Samir Bensaid ◽  
Nunzio Russo ◽  
Debora Fino
Keyword(s):  
Diesel Particulate Filter ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Diesel Particulate ◽  
Bench Scale ◽  
Passive Regeneration

scholarly journals Nanostructure changes in diesel soot during NO2–O2 oxidation under diesel particulate filter-like conditions toward filter regeneration

2018 ◽  
Vol 20 (8-9) ◽  
pp. 953-966 ◽  
Author(s):  
Madhu Singh ◽  
Mek Srilomsak ◽  
Yujun Wang ◽  
Katsunori Hanamura ◽  
Randy Vander Wal
Keyword(s):  
Diesel Particulate Filter ◽  
Surface Oxidation ◽  
Soot Oxidation ◽  
Diesel Soot ◽  
Particulate Filter ◽  
Exhaust Gas ◽  
Fringe Analysis ◽  
Diesel Particulate ◽  
Oxidation Rates ◽  
Passive Regeneration

Development of the regeneration process on diesel particulate filters requires a better understanding of soot oxidation phenomena, especially its relation to soot nanostructure. Nitrogen dioxide (NO2) is known to play an essential role in passive regeneration by oxidizing soot at low temperatures, especially in the presence of oxygen (O2) in the exhaust. However, change in soot nanostructure due to oxidation by NO2–O2 mixtures has not received much attention. This work focuses on nanostructure evolution during passive regeneration of the diesel particulate filter by oxidation of soot at normal exhaust gas temperatures (300°C–400°C). High-resolution transmission electron microscopy of partially oxidized model carbons (R250, M1300, arc-generated soot) and diesel soot under NO2–O2 mixtures is used to investigate physical changes in nanostructure correlating with the material’s behavior during oxidation. Microscopy reveals the changing nanostructure of model carbons during oxidation while fringe analysis of the images points to the differences in the structural metrics of fringe length and tortuosity of the resultant structures. The variation in oxidation rates highlights the inter-dependence of the material’s reactivity with its structure. NO2 preferentially oxidizes edge-site carbon, promotes surface oxidation by altering the particle’s burning mode with increased overall reactivity of NO2+O2 resulting in inhibition of internal burning, typically observed by O2 at exhaust gas temperatures.

Boundary Conditions for Combustion Field and LB Simulation of Diesel Particulate Filter

2013 ◽  
Vol 13 (3) ◽  
pp. 769-779 ◽  
Author(s):  
Kazuhiro Yamamoto
Keyword(s):  
Lattice Boltzmann ◽  
Diesel Particulate Filter ◽  
Complex Geometry ◽  
Numerical Procedure ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Soot Combustion ◽  
Diesel Particulate ◽  
Soot Deposition ◽  
Lattice Boltzmann Simulation

AbstractA diesel particulate filter (DPF) is a key technology to meet future emission standards of particulate matters (PM), mainly soot. It is generally consists of a wall-flow type filter positioned in the exhaust stream of a diesel vehicle. It is difficult to simulate the thermal flow in DPF, because we need to consider the soot deposition and combustion in the complex geometry of filter wall. In our previous study, we proposed an approach for the conjugate simulation of gas-solid flow. That is, the gas phase was simulated by the lattice Boltzmann method (LBM), coupled with the equation of heat conduction inside the solid filter substrate. However, its numerical procedure was slightly complex. In this study, to reduce numerical costs, we have tested a new boundary condition with chemical equilibrium in soot combustion at the surface of filter substrate. Based on the soot oxidation rate with catalysts evaluated in experiments, the lattice Boltzmann simulation of soot combustion in the catalyzed DPF is firstly presented to consider the process in the after-treatment of diesel exhaust gas. The heat and mass transfer is shown to discuss the effect of catalysts.

Modelling of Soot Oxidation by NO2 in a Diesel Particulate Filter

2011 ◽  
Vol 5 (1) ◽  
pp. 359-369 ◽  
Author(s):  
Mehrdad Ahmadinejad ◽  
Athanasios Tsolakis ◽  
Jan M. Becker ◽  
Claus F. Goersmann ◽  
Andrew D. Newman ◽  
...  
Keyword(s):  
Diesel Particulate Filter ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Diesel Particulate

A Novel α-Al2O3 Diesel Particulate Filter with Alkali Metal-Based Catalyst for Diesel Soot Oxidation

2013 ◽  
Vol 56 (1-8) ◽  
pp. 473-476 ◽  
Author(s):  
Keisuke Mizutani ◽  
Kensuke Takizawa ◽  
Hironobu Shimokawa ◽  
Takumi Suzawa ◽  
Naohisa Ohyama
Keyword(s):  
Alkali Metal ◽  
Diesel Particulate Filter ◽  
Soot Oxidation ◽  
Diesel Soot ◽  
Particulate Filter ◽  
Diesel Particulate ◽  
Diesel Soot Oxidation ◽  
Α Al2o3

scholarly journals Experimental Evaluation on the Catalytic Activity of a Novel CeZrK/rGO Nanocomposite for Soot Oxidation in Catalyzed Diesel Particulate Filter

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 674
Author(s):  
Gang Wu ◽  
Ke Tang ◽  
Deng Wu ◽  
Yuelin Li ◽  
Yuqiang Li
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Diesel Particulate Filter ◽  
Oxygen Vacancies ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Large Specific Surface Area ◽  
Diesel Particulate ◽  
Redox Capacity ◽  
Catalyzed Diesel Particulate Filter

A nanostructured solid solution catalyst CeZrK/rGO for soot oxidation in catalyzed diesel particulate filter was synthesized using the dipping method. The reduced graphene oxide (rGO) was used as the catalyst carrier, and CeO2, ZrO2, and K2O were mixed with the molar ratio of 5:1:1, 5:2:2 and 5:3:3, which were referred to as Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO, respectively. The structure, morphology and catalytic activity of the CeZrK/rGO nanocomposites were thoroughly investigated and the results show that the CeZrK/rGO nanocomposites have nanoscale pore structure (36.1–36.9 nm), high-dispersion quality, large specific surface area (117.2–152.4 m2/g), small crystallite size (6.7–8.3 nm), abundant oxygen vacancies and superior redox capacity. The 50% soot conversion temperatures of Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO under tight contact condition were decreased to 352 °C, 339 °C and 358 °C respectively. The high catalytic activity of CeZrK/rGO nanocomposites can be ascribed to the following factors: the doping of Zr and K ions causes the nanocrystalline phase formation in CeZrK solid solutions, reduces the crystallite size, generates abundant oxygen vacancies and improves redox capacity; the rGO as a carrier provides a large specific surface area, thereby improving the contact between soot and catalyst.

scholarly journals Simulation on Soot Oxidation with NO2 and O2 in a Diesel Particulate Filter

2007 ◽  
Vol 2 (2) ◽  
pp. 245-255 ◽  
Author(s):  
Kazuhiro YAMAMOTO ◽  
Shingo SATAKE ◽  
Hiroshi YAMASHITA ◽  
Akira OBUCHI ◽  
Junko UCHISAWA
Keyword(s):  
Diesel Particulate Filter ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Diesel Particulate
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