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Issue 14, 2017
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Crucial role of titanium dioxide support in soot oxidation catalysis of manganese doped ceria

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Abstract

The influence of an anatase-TiO2 support on the diesel soot oxidation catalytic activity of manganese doped ceria is investigated. The soot conversion light-off temperature is significantly lowered with the application of anatase-TiO2 as the support in comparison to the unsupported and γ-Al2O3 supported CeO2–MnOx catalysts. Additionally, considerable enhancement in bulk and surface defects is observed for CeO2–MnOx/TiO2, which is attributed to the promotional role of the CeO2/TiO2 interface in the formation and stabilization of defect sites. The temperature programmed desorption of oxygen (O2-TPD) study of CeO2–MnOx/TiO2 indicates a sharp increase in oxygen desorption after a temperature of 500 K. In good correlation, the diesel soot conversion substantially increases after 550 K, but below this temperature the TiO2 supported catalyst exhibits comparable activity to that of the γ-Al2O3 supported catalyst. Increased oxygen mobility at elevated temperatures might play a key role in the performance of the TiO2 supported catalyst. Moreover, its structural stability and appreciable catalytic activity were retained even after high temperature annealing treatment.

Graphical abstract: Crucial role of titanium dioxide support in soot oxidation catalysis of manganese doped ceria

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Publication details

The article was received on 22 May 2017, accepted on 31 May 2017 and first published on 31 May 2017


Article type: Paper
DOI: 10.1039/C7CY01029J
Citation: Catal. Sci. Technol., 2017,7, 3045-3055
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    Crucial role of titanium dioxide support in soot oxidation catalysis of manganese doped ceria

    D. Mukherjee, P. Venkataswamy, D. Devaiah, A. Rangaswamy and B. M. Reddy, Catal. Sci. Technol., 2017, 7, 3045
    DOI: 10.1039/C7CY01029J

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