Characterization of soot deposition and oxidation process on catalytic diesel particulate filter with ash loading through an optimized visualized method

Du, Yuheng; Meng, Zhongwei; Fang, Jia; Quan, Yuan; Jiang, Yuan; Li, Shuang; Li, Jiansong; Chen, Chao; Bai, Weilian

doi:10.1016/j.fuel.2019.01.103

Cited by 50 publications

(19 citation statements)

References 23 publications

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“…Specifications of CDPFs. In order to study the effect of noble metal loadings on the aging performance of CDPF, three different CDPFs were designed based on reference and engineering application experience 8,31 , and their specifications are shown in Specifications of the vehicles. The designed CDPFs were installed on the same series buses, which were selected from a bus fleet on the same line.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In order to study the effect of noble metal loadings on the aging performance of CDPF, three different CDPFs were designed based on reference and engineering application experience 8 , 31 , and their specifications are shown in Table 1 . The noble metal loadings of the CDPFs are 0.53, 1.71 and 1.24 g/L, and named No.1, No.2 and No.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The catalyzed diesel particulate filter (CDPF) manufactured by coating noble metal catalyst such as Pt and Pd et al on the wall of DPF is being widely employed as an efficient diesel emission control technology 7 . It can not only oxidize CO, HC and increase the NO 2 proportion by oxidizing NO 8 , but also filter the particles with a high efficiency 9 , and achieve a regeneration of the CDPF by oxidizing the trapped particles with a relatively low temperature 10 . The Pt and Pd have strong catalytic activity in oxidizing CO, HC and NO.…”

Section: Introductionmentioning

confidence: 99%

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Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Zhang

Lou

Tan

et al. 2020

Sci Rep

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Catalyzed diesel particulate filters (CDPFs) have been widespread used as a technically and economically feasible mean for meeting increasingly stringent emissions limits. An important issue affecting the performance of a CDPF is its aging with using time. In this paper, the effects of noble metal loadings, regions and using mileage on the aging performance of a CDPF were investigated by methods of X-ray diffraction (XRD), X-ray photoelectron spectroscopy and catalytic activity evaluation. Results showed that aging of the CDPF shifted the XRD characteristic diffraction peaks towards larger angles and increased the crystallinity, showing a slowing downward trend with the increase of the noble metal loadings. In addition, the increase of the noble metal loading would slow down the decline of Pt and Pt4+ concentration caused by aging. The characteristic temperatures of CO, C3H8 conversion and NO2 production increased after aging, and the more the noble metal loadings, the higher the range of the increase. But noticeably, excessive amounts of noble metals would not present the corresponding anti-aging properties. Specifically, the degree of aging in the inlet region was the deepest, the following is the outlet region, and the middle region was the smallest, which were also reflected in the increase range of crystallinity, characteristic temperatures of CO, C3H8 conversion and NO2 production, as well as the decrease range of Pt and Pt4+ concentrations. The increase of aging mileage reduced the size of the aggregates of the soot and ash in CDPFs, however, improved the degree of tightness between particles. Meanwhile Carbon (C) concentration in the soot and ash increased with the aging mileage.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Zhang

Lou

Tan

et al. 2020

Sci Rep

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“…As the typical commercial synthetic soot, PU employed in this study is sourced from Degussa Gmbh, which is able to maintain high experimental repeatability 34,35 and the detailed parameters are listed in Table 1. To simulate the major ash contents of exhaust soot discharged from the diesel engine, four kinds of ash were adopted, including ZnO, SiO 2 , Fe 2 O 3 , and CaSO 4 .…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

Thermogravimetric analysis of soot combustion in the presence of ash and soluble organic fraction

et al. 2020

Self Cite

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“…It is worth remembering that our simulations were run assuming the cake to be absent, and that all the soot trapped inside the wall of the filter is in contact with the catalyst. In real-world applications, the accumulation of ash, which is considered as one of the greatest challenges [25,26], will tend to progressively complicate the conditions of soot-catalyst contact and, although the ash itself may have a catalytic effect on soot [27], this will impact on the regeneration performance of the catalytic filter, even when starting with high catalyst activity (i.e., high values of k).…”

Section: Figure 12mentioning

confidence: 99%

Using CFD Simulation as a Tool to Identify Optimal Operating Conditions for Regeneration of a Catalytic Diesel Particulate Filter

Sarli

Benedetto

2019

Applied Sciences

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In the work presented in this paper, CFD-based simulations of the regeneration process of a catalytic diesel particulate filter were performed with the aim of identifying optimal operating conditions in terms of trade-off between time for regeneration and peak temperature. In the model, all the soot trapped inside the filter was assumed to be in contact with the catalyst. Numerical results have revealed that optimization can be achieved at low inlet gas velocity by taking advantage of the high sensitivity of the soot combustion dynamics to the availability of oxygen. In particular, optimal conditions have been identified when operating with highly active catalysts at sufficiently low inlet gas temperatures, so as to lie on the boundary between kinetics-limited regeneration and oxygen transport-limited regeneration. As catalyst activity is increased, this boundary progressively shifts towards lower inlet gas temperatures, resulting in lower peak temperatures and shorter times for filter regeneration. Under such conditions, in order to further speed up the process while still ensuring temperature control, it is essential to keep the filter adequately hot, thus minimizing the time required for the preheating phase, which may be a significant part (up to 65%) of the total time required for regeneration (preheating plus soot consumption).

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Characterization of soot deposition and oxidation process on catalytic diesel particulate filter with ash loading through an optimized visualized method

Cited by 50 publications

References 23 publications

Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Thermogravimetric analysis of soot combustion in the presence of ash and soluble organic fraction

Using CFD Simulation as a Tool to Identify Optimal Operating Conditions for Regeneration of a Catalytic Diesel Particulate Filter

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