Multi-catalytic soot filtration in automotive and marine applications

Johansen, Keld

doi:10.1016/j.cattod.2015.06.001

Cited by 32 publications

(10 citation statements)

References 45 publications

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“…A major portion of carbon black oxidised at 700 °C. Oxidation of exhaust soot is typically observed at temperatures above 600 °C, when no catalytic assistance for oxidation is used (Johansen, 2015). For the distillate 0.1%S and Bio30 fuels, EC combusted at above 700 °C in the O 2 /He phase, indicating the presence of refractory, graphitic-type EC.…”

Section: Fig 3 Thermograms Using the Eusaar2 Programme For A) Wet Anmentioning

confidence: 99%

Considerations in analysing elemental carbon from marine engine exhaust using residual, distillate and biofuels

Aakko-Saksa

Koponen

Aurela

et al. 2018

Journal of Aerosol Science

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Elemental carbon (EC) concentrations in the exhaust of a medium-speed marine engine was evaluated using thermal-optical analysis (TOA). Particulate matter (PM) samples were collected at 75% and 25% engine loads using residual and distillate fuels with sulphur contents of 2.5%, 0.5% and 0.1%, and a biofuel (30% of bio-component). The EC analysis of PM samples from a marine engine proved to be challenging. For example, transformations of structure of the sampled particles in the inert and the oxygen mode were observed for marine engine exhaust samples. The relationship between constituents present in the samples from the marine engine using different fuels, and phenomena observed in the thermograms are discussed. Temperature protocol selection and sample pre-treatment (extractions and drying) affected the reported EC mass. Modifications in the methodology were suggested to increase the accuracy of the analysis. Repeatability and reproducibility of the EC analysis was studied in the round-robin of three laboratories. Keywords: Elemental carbon EC; thermal-optical analysis TOA; thermogram; marine engine; fuel; round-robin Highlights  EC analysis was challenging for marine engine exhaust samples  The behaviour observed in the thermograms changed depending on the fuel  Temperature protocol used and sample extraction affected the EC results  Interlaboratory round-robin of EC analysis showed differences between laboratories

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Section: Fig 3 Thermograms Using the Eusaar2 Programme For A) Wet Anmentioning

confidence: 99%

Considerations in analysing elemental carbon from marine engine exhaust using residual, distillate and biofuels

Aakko-Saksa

Koponen

Aurela

et al. 2018

Journal of Aerosol Science

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“…The accumulated Diesel soot causes an increase in pressure drop, and this influences the fuel consumption or leads to filter failure [2]. In the absence of a filter regeneration process, the car engine will stop due to DPF plugging [5]. Today, active and passive regeneration processes are established.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Hebert

Stöwe

2020

Materials

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In this paper, the syntheses of a set of cerium-bismuth mixed oxides with the formula Ce 1−x Bi x O 2−x/2 , where the range of x is 0.0 to 1.0 in 10 mol% steps, via co-precipitation methods is described. Two synthesis routes are tested: The "normal" and the so called "reverse strike" (RS) co-precipitation route. The syntheses are performed with an automated synthesis robot. The activity for Diesel soot oxidation is measured by temperature programmed oxidation with an automated, serial thermogravimetric and differential scanning calorimetry system (TGA/DSC). P90 is used as a model soot. An automated and reproducible tight contact between soot and catalyst is used. The synthesized catalysts are characterized in terms of the specific surface area according to Brunauer, Emmett and Teller (S BET ), as well as the dynamic oxygen storage capacity (OSC dyn ). The crystalline phases of the catalysts are analysed by powder X-ray diffraction (PXRD) and Raman spectroscopy. The elemental mass fraction of the synthesized catalysts is verified by X-ray fluorescence (XRF) analysis. A correlation between the T 50 values, OSC dyn and S BET has been discovered. The best catalytic performance is exhibited by the catalyst with the formula RS-Ce 0.8 Bi 0.2 O x which is synthesized by the reverse strike co-precipitation route. Here, a correlation between activity, OSC dyn , and S BET can be confirmed based on structural properties.

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“…As the diesel exhaust gas flows through the cDPF, the PM contained in exhaust gas is trapped and deposited on the walls of inlet passages during the T f , as shown in Figures and . After the DPF system is started, the temperatures in the cDPF can be kept higher than 823 K. The temperature of the light off of soot oxidation is T l2 = 873 K in loose contact between the soot and catalyst, and the temperature of the light off is T l1 = 693 K in intimate contact for a cDPF. − The soot particulates on the walls are oxidized into CO 2 and the residual ash particles remained on the walls of the inlet passages in the cDPF, as shown in Figures and . , The short residence time results in the incomplete soot oxidation and the rapid CO generation in the cDPF. CO from the cDPF is oxidized into CO 2 in the right DOC.…”

Section: Analysis Of Rfrmentioning

confidence: 99%

Experimental Study on a Diesel Particulate Filter with Reciprocating Flow

et al. 2019

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In this article, a new diesel particulate filter (DPF) system with reciprocating flow is proposed, and an experimental study on the characteristics of the active–passive component regeneration of the DPF system is carried out. Several control parameters such as temperature distribution, pressure difference, and pollution emissions of the DPF system are measured for different reciprocating cycles. The mechanism of reciprocating flow regeneration of the DPF system and the effects of the reciprocating flow cycle on the performance of the DPF system are analyzed. Results show that (1) the DPF system can use a tiny amount of extra fuel to maintain the chemical reaction, which in turn realizes the regeneration of the catalyzed DPF because of its properties of heat recovery and reverse blowing of ash; (2) with the increase in the reciprocating flow cycle, the temperature profile moves toward the downstream side of the DPF system and the fluctuation amplitudes of the components of CO, NO, and NO2 increase; (3) if reasonable temperature distribution is formed in the DPF system for a certain reciprocating cycle, the regeneration efficiency can be obviously improved and the average content of particulate matter emission can be kept at quite a low level.

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Multi-catalytic soot filtration in automotive and marine applications

Cited by 32 publications

References 45 publications

Considerations in analysing elemental carbon from marine engine exhaust using residual, distillate and biofuels

Considerations in analysing elemental carbon from marine engine exhaust using residual, distillate and biofuels

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Experimental Study on a Diesel Particulate Filter with Reciprocating Flow

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