Performance of Diesel Soot Oxidation in the Presence of Ash Species

Fang, Jia; Meng, Zhongwei; Meng, Zhongwei; Jiang, Yuan; Liu, Jing; Zhang, Qian; Tan, Jie

doi:10.1021/acs.energyfuels.9b03085

Cited by 25 publications

(11 citation statements)

References 48 publications

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“…The first-order TG curves decrease by about 5%, which is due to the evaporation of water in the sample. 34 The second stage shows a slow decline at about 10%, because volatile components such as SOF are broken down. The oxidation reaction of soot mainly occurs in the third stage, and the sample reacts rapidly with the increase in temperature.…”

Section: Resultsmentioning

confidence: 99%

“…33 applied a thermogravimetric analyzer (TGA) to study the influence of different ash types on the oxidation performance of soot and indicated that the PU/ZnO mixture has the maximum comprehensive oxidation index (S ) compared with PU/Al 2 O 3 and PU/MgO mixtures. 34 Furthermore, Zhang et al used a thermogravimetric analyzer to study the interaction effect of SOF and ash on diesel soot oxidation, and the result shows that the mass ratio of PU/ZnO/15 W at 1/1/0.1 has a best combustion performance under an O 2 /N 2 atmosphere. 24 Soot oxidation characteristics are studied from the aspects of ash content, type of lubricating oil, the microstructure of soot, catalyst, and different operating parameters.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Operating Parameters on Oxidation Characteristics of Soot under the Synergistic Action of Soluble Organic Fractions and Ash

Fang

Zhang

et al. 2021

ACS Omega

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Diesel particulate filter is used to reduce particulate matter (PM) emission due to the stringent emission standards. The accumulated PM has been oxidized by the periodical regeneration method to avoid pressure buildup. The innovation of this study is to explore the oxidation performance of Printex-U (PU), which is mixed with ash and soluble organic fractions, under different operating conditions. Different aspects of operating parameters, such as the oxygen ratio in an O 2 /N 2 atmosphere, total flow rate, initial PU mass, and heating rate, on PU oxidation properties have been critically discussed using a thermogravimetric analyzer. The oxygen ratio in the O 2 /N 2 atmosphere is positively correlated with the oxidation characteristics of PU. The comprehensive oxidation index (S ) of PU under the 20% O 2 /80% N 2 atmosphere increases by 184% compared with the 10% O 2 /90% N 2 atmosphere. When the initial PU mass is 3 mg, the combustion stability coefficient (R w ) and S reach the best values, which are 55.53 × 10 5 and 2.03 × 10 7 % 2 min −2 °C−3 , respectively. With the increase in the heating rate, the oxidation properties of PU become sensible and deflagration occurs easily, so that 10 °C/min heating rate is the best option. This study provides a theoretical basis for the optimization design of diesel particulates during the regeneration process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Operating Parameters on Oxidation Characteristics of Soot under the Synergistic Action of Soluble Organic Fractions and Ash

Fang

Zhang

et al. 2021

ACS Omega

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“…To ensure the stability of the instrument, the 10 min remaining time at the start and end of each experiment is carried out by computer program. The inlet flow rate, oxygen concentration and heating rate are 100 mL min −1 , 10% and 10 • C min −1 , respectively [31,32]. As the protective gas, the concentration of nitrogen is 90%.…”

Section: Discussionmentioning

confidence: 99%

Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

et al. 2021

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Diesel particulates are deposited in the diesel particulate filter and removed by the regeneration process. The Printex-U (PU) particles are simulated as the diesel soot to investigate the influence of thermal aging conditions on soot combustion performance with the addition of catalysts. The comprehensive combustion index S, combustion stability index Rw and peak temperature Tp are obtained to evaluate the combustion performance. Compared with the PU/Pt mixtures of different Pt contents (2 g/ft3, 3.5 g/ft3, and 5 g/ft3), the 10 g/ft3 Pt contents improve soot combustion with the outstanding oxygen absorption ability. When the weight ratio of PU/Pt mixture is 1:1, the promoted effect achieves the maximum degree. The S and Rw increase to 8.90 × 10−8 %2min−2°C−3 and 39.11 × 105, respectively, compared with pure PU. After the thermal aging process, the PU/Pt mixture with a 350 °C aging temperature for 10 h promotes the soot combustion the best when compared to pure PU particles. It is not good as the PU/Pt mixture without aging, because the inner properties of soot and Pt/Al2O3 catalyst may have been changed. The S and Rw are 9.07 × 10−8 %2min−2°C−3 and 38.39 × 105, respectively, which are close to the no aging mixture. This work plays a crucial role in understanding the mechanism of the comprehensive effect of soot and catalyst on soot combustion after the thermal aging process.

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“…PU is widely used to replace diesel engine emission particles because of its similar physical and chemical properties to diesel engine emission particles. − It is well known that thermogravimetric analysis is a method to reflect the oxidation properties of substances, because the degree of weight loss during heat treatment can be represented by the TGA diagram. − The major properties of PU (Degussa GmbH, Frankfurt, Germany) employed in TGA tests are shown in Table . A fixed bed reactor is used to provide different aging conditions for PU and PU/catalyst/ash mixtures, and its main parameters are shown in Table .…”

Section: Description Of Experimentsmentioning

confidence: 99%

Effect of Different Aging Conditions on the Soot Oxidation by Thermogravimetric Analysis

et al. 2020

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Diesel particulate filter is an effective device to reduce diesel particulate emission. The particles in diesel particulate filter are usually affected by the aging of high-temperature exhaust gas before the regeneration process. In order to investigate the effect of aging conditions on the soot oxidation process, the effect of aging temperature and aging time on the oxidation process of carbon black (Printex-U, PU) and the PU/catalyst/ash mixture are studied by thermogravimetric analysis. The aging PU particles have lower starting temperature, peaking temperature, ending temperature, and activation energy. Compared with the particles without aging, the PU particles with a 400 °C aging temperature and 20 h aging time are able to reduce the activation energy from 191.2 to 158 kJ/mol. Low aging temperatures (200–300 °C) and the catalyst have a certain synergistic effect on the improvement of PU oxidation activity. The PU/CeO2 mixture with a 300 °C aging temperature and 20 h aging time decreases the activation energy from 178.4 to the lowest 113.6 kJ/mol. The addition of CaSO4 in PU particles cannot stop the improvement of its oxidation activity by aging, but it reduces the effect of aging. This work is helpful to reveal the mechanism of aging on PU and the PU/catalyst/ash mixture in air environment.

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Performance of Diesel Soot Oxidation in the Presence of Ash Species

Cited by 25 publications

References 48 publications

Effect of Operating Parameters on Oxidation Characteristics of Soot under the Synergistic Action of Soluble Organic Fractions and Ash

Effect of Operating Parameters on Oxidation Characteristics of Soot under the Synergistic Action of Soluble Organic Fractions and Ash

Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

Effect of Different Aging Conditions on the Soot Oxidation by Thermogravimetric Analysis

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