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Sulphation and ammonia regeneration of Pt/MnOx-CeO2/Al2O3 catalyst for NOx-assisted soot oxidation

Abstract

The sulphur resistance and regeneration strategy of soot oxidation catalysts are critical to the application of the catalytic diesel particulate filter (CDPF). In the present work, the Pt/MnOx-CeO2/Al2O3, Pt/Al2O3 and MnOx-CeO2/Al2O3 catalysts were sulphated and regenerated with ammonia. The soot oxidation activity of the poisoned Pt/MnOx-CeO2/Al2O3 was recovered completely after a 30 min reduction in 500 ppm NH3 at 550 °C. The amount, distribution and structure of sulphates were studied comprehensively for the sulphated and regenerated samples by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, CO chemisorption and transmission electron microscope (TEM). The NO oxidation of Pt catalysts was found to depend strongly on the particle size distribution, surface exposure and oxidation state of the precious metal. This, as well as the effect of the remaining surface sulphates, helped the regenerated catalysts achieved even higher catalytic activity for soot oxidation.

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Publication details

The article was received on 04 Jan 2018, accepted on 07 Feb 2018 and first published on 07 Feb 2018


Article type: Paper
DOI: 10.1039/C8CY00027A
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Sulphation and ammonia regeneration of Pt/MnOx-CeO2/Al2O3 catalyst for NOx-assisted soot oxidation

    Y. Gao, X. Wu, R. Nord, H. Härelind and D. weng, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00027A

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