Diesel Oxidation Catalyst Pt–Pd/MnOx–Al2O3 for Soot Emission Control: Effect of NO and Water Vapor on Soot Oxidation Full article
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Topics in Catalysis
ISSN: 1022-5528 , E-ISSN: 1572-9028 |
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| Output data | Year: 2023, Volume: 66, Pages: 860–874 Pages count : 15 DOI: 10.1007/s11244-022-01779-z | ||
| Tags | Soot; Diesel exhaust; Diesel oxidation catalyst; Manganese-alumina catalyst; Noble metals | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0014 |
Abstract:
The operation of diesel engines is accompanied by the emission of soot particles and nitrogen oxides, which have a harmful effect on the environment. In this paper, the effect of the composition of a gas feeds simulating the diesel engine exhaust gases on the oxidation of diesel soot particles on the surface of a diesel oxidizing catalyst Pt–Pd/MnOx–Al2O3 with a total Pt–Pd content of 15 g/f3 is considered. The rate and effective activation energy of catalytic oxidation of diesel soot with oxygen and NOx were studied in the isothermal mode with varying concentrations of O2 in the presence of NO and/or water vapor. It was revealed that the rate of catalytic oxidation of soot depends on the concentration of O2 (2.5–10 vol.%) and NO (300–450 ppm), but this effect is significant at soot conversion below 45–50%. It was found that the decrease in the rate of soot oxidation slows down after reaching 25–30% of soot burnout, probably due to the accumulation of O-containing groups on the surface of graphite-like soot structures and an increase in soot defectiveness. Water vapor (10 vol.%) alone did not catalyze the oxidation of soot up to temperatures of 475 °C. In the presence of oxygen, the soot oxidation with a wet feed proceeded more easily than with a dry mixture at temperatures of 400 and 425 °C; the promoting effect of water weakened at higher temperatures, and at a temperature of 475 °C had a negative character. In a wet mixture containing O2 and NO, the soot oxidation was inhibited by water vapor at temperatures of 375–450 °C. The reason was low generation of NO2 over catalyst Pt–Pd/MnOx–Al2O3 under wet conditions.
Cite:
Yashnik S.A.
, Ismagilov Z.R.
Diesel Oxidation Catalyst Pt–Pd/MnOx–Al2O3 for Soot Emission Control: Effect of NO and Water Vapor on Soot Oxidation
Topics in Catalysis. 2023. V.66. P.860–874. DOI: 10.1007/s11244-022-01779-z WOS Scopus РИНЦ AN OpenAlex
Diesel Oxidation Catalyst Pt–Pd/MnOx–Al2O3 for Soot Emission Control: Effect of NO and Water Vapor on Soot Oxidation
Topics in Catalysis. 2023. V.66. P.860–874. DOI: 10.1007/s11244-022-01779-z WOS Scopus РИНЦ AN OpenAlex
Dates:
| Accepted: | Dec 27, 2022 |
| Published online: | Jan 16, 2023 |
| Published print: | Aug 1, 2023 |
Identifiers:
| Web of science: | WOS:000914289400001 |
| Scopus: | 2-s2.0-85146267195 |
| Elibrary: | 53804756 |
| Chemical Abstracts: | 2023:168569 |
| OpenAlex: | W4316500519 |