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CO oxidation over MOx (M = Mn, Fe, Co, Ni, Cu) supported on SmMn2O5 composite catalysts

Abstract

The ability to oxidize CO at relatively low temperature is barely satisfactory for the pure SmMn2O5 (SMO) catalysts. While loading precious metals like platinum nanoclusters on mullite SMO is an effective approach to enhance its catalytic performance, the high cost of noble metals limited its large scale applation. In this work, we systematically study the alternative approach of composite catalyst formation by loading non-precious metal oxides MOx (M = Mn, Fe, Co, Ni, Cu) onto SMO mullite for CO oxidation. The X-ray fluorescence (XRF) and high-resolution transmission electron microscope (HRTEM) analysis shows that composite catalysts are successfully formed by loading MOx nanoparticles at a content of ~ 0.7 wt.% through deposition precipitation (DP) method. Except for FeOx, MOx loaded samples in general exhibit much higher reaction rates of CO oxidation than that of bare SMO especially at the temperature range below 100 ˚C. The promoted activity for MOx/SMO composites can be attributed to the improved reducibility of adsorbed oxygen (Oads) and increased oxidation state of Mn cations at the interface. Such behavior accelerates the decomposition of carbonates, as indicated by the H2 temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy results. We demonstrate that the best catalytic performance of CuOx/SMO composite also stems from the additional CO adsorption on CuOx sites. The work presented herein provides a method to enhance the CO oxidation performance of SMO and helps understanding the oxidation reactions mechanism on involving mullites with loaded transition metal oxides (TMOs).

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Publication details

The article was received on 20 Jun 2018, accepted on 14 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8CY01263F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    CO oxidation over MOx (M = Mn, Fe, Co, Ni, Cu) supported on SmMn2O5 composite catalysts

    Y. Lang, J. Zhang, Z. Feng, X. Liu, Y. Zhu, T. Zeng, Y. Zhao, R. Chen and B. Shan, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01263F

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