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Reasons for the disintegration of microspherical precursor MnCO3 for soot combustion catalysts Ptδ+/MnOx

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Abstract

Supported Ptδ+/MnOx catalysts were prepared for diesel soot combustion in NOx/O2. During the deposition–precipitation (DP) of Pt(NO3)2 at pH ≥ 9, microspherical precursor MnCO3 showed an interesting disintegration. To determine the underlying reasons for this phenomenon, other wet-chemical treatments (Pt(NO3)2 impregnation or NH3·H2O-treatment) toward MnCO3 and the DP of Pt(NO3)2 on calcined MnOx were designed and conducted, demonstrating that interactions with Pt(NO3)2 and/or accelerated dissolution at high pH (∼11) could induce MnCO3 disintegration. Such facile wet-chemical treatments also gave final calcined products with different phase compositions and surface chemical properties, resulting in different catalytic activities for soot combustion. Among them, the DP of Pt(NO3)2 at moderate pH (∼9) and Pt(NO3)2 impregnation both led to refined particle sizes and satisfying Pt dispersion, which exposed abundant active sites. Furthermore, oxygen species desorbed at moderate temperatures and NOx species were found to be directly related to the specific catalytic activity. The key factor was found to be the refined particle size (namely, the catalyst–soot contact efficiency). Furthermore, plausible reaction pathways were proposed for soot combustion over Ptδ+/MnOx-type catalysts.

Graphical abstract: Reasons for the disintegration of microspherical precursor MnCO3 for soot combustion catalysts Ptδ+/MnOx

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Publication details

The article was received on 23 Mar 2019, accepted on 29 Apr 2019 and first published on 30 Apr 2019


Article type: Paper
DOI: 10.1039/C9CY00572B
Catal. Sci. Technol., 2019, Advance Article

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    Reasons for the disintegration of microspherical precursor MnCO3 for soot combustion catalysts Ptδ+/MnOx

    H. Zhao, H. Li, Z. Pan, F. Feng, Y. Gu, S. Chang, J. Du and Y. Zhao, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00572B

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