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Modified hierarchical birnessite-type manganese oxide nanomaterials for CO catalytic oxidation

Abstract

The hierarchical birnessite-type manganese oxide catalysts modified by transition metal (Cobalt, Cerium, Copper, and Nickle) cations were synthesized via a facile hydrothermal reaction. The influence of doping elements on the structure and catalytic behavior of the as-prepared catalysts was thoroughly investigated by the characterization techniques of XRD, SEM, TEM, BET, ICP-OES, XPS, FT-IR, TGA and H2-TPR. The results indicated that the doping of different transition metal cations was found to hardly alter the phase structures and morphologies of the as-obtained birnessite, whereas displayed distinct differences in catalytic activity for CO oxidation. The doping of Ce(Ⅲ) and Cu(Ⅱ) remarkably promoted the catalytic performance while Co(Ⅱ) and Ni(Ⅱ) induced a passive effect on the activity. Ce-MnO2 exhibited superior CO oxidation activity at lower temperature with T50 = 146 °C and T90 = 175 °C in comparison with the pristine birnessite, while Cu-MnO2 possessed the best activity at relatively low temperature below 120 °C with Tlight-off = 65 °C. The mobility and reducibility of lattice oxygen were found to be the determinant for CO oxidation, in substantial correlation with the generation of surface oxygen vacancies and activation of lattice oxygen species. These features could be mostly ascribed to the formation of a synergistic Ce-Mn and Cu-Mn interaction in their respective lattice oxides, however, in different ways.

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Publication details

The article was received on 17 May 2018, accepted on 08 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02457J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Modified hierarchical birnessite-type manganese oxide nanomaterials for CO catalytic oxidation

    X. Wang, W. Huo, Y. Xu, Y. Guo and Y. Jia, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02457J

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