The Oxidation Performance of a Carbon Soot Catalyst Based on the Pt-Pd Synergy Effect

Diming Lou, Guofu Song, Kaiwen Xu, Yunhua Zhang () and Kan Zhu
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Diming Lou: School of Automotive Studies, Tongji University, Shanghai 201800, China
Guofu Song: School of Automotive Studies, Tongji University, Shanghai 201800, China
Kaiwen Xu: School of Automotive Studies, Tongji University, Shanghai 201800, China
Yunhua Zhang: School of Automotive Studies, Tongji University, Shanghai 201800, China
Kan Zhu: School of Automotive Studies, Tongji University, Shanghai 201800, China

Energies, 2024, vol. 17, issue 7, 1-11

Abstract: Pt-Pd-based noble metal catalysts are widely used in engine exhaust aftertreatment because of their better carbon soot oxidation performance. At present, the synergistic effect of Pt and Pd in CDPFs, which is the most widely used and common doping method, in catalyzing the combustion of carbon smoke has not been reported, and it is not possible to give an optimal doping ratio of Pt and Pd. This paper investigates the carbon soot oxidation performance of different Pt/Pd ratios (Pt/Pd = 1:0, 10:1, 5:1, 1:1) based on physicochemical characterization and particle combustion kinetics calculations, aiming to reveal the Pt-Pd synergistic effect and its carbon soot oxidation law. The results show that Pt-based catalysts doped with Pd can improve the catalyst dispersion, significantly increase the specific surface area, and reduce the activation energy and reaction temperature of carbon soot reactions, but excessive doping of Pd leads to the enhancement of the catalyst agglomeration effect, a decrease in the specific surface area, and an increase in the activation energy and reaction temperature of the carbon soot reaction. The specific surface area and pore capacity of the catalyst are the largest, and the activation energy of particle oxidation and the pre-exponential factor are the smallest (203.44 kJ∙mol −1 and 6.31 × 10 7 , respectively), which are 19.29 kJ∙mol −1 and 4.95 × 10 8 lower than those of pure carbon soot; meanwhile, the starting and final combustion temperatures of carbon soot (T 10 and T 90 ) are the lowest at 585.8 °C and 679.4 °C, respectively, which are 22.1 °C and 20.9 °C lower than those of pure carbon soot.

Keywords: Pt-Pd synergy; carbon soot; physicochemical properties; combustion kinetics; oxidation properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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