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Issue 7, 2017
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Controllable synthesis of Ce-doped α-MnO2 for low-temperature selective catalytic reduction of NO

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Abstract

The activity for selective catalytic reduction (SCR) of NO is related to the LUMO energy level of Mn atoms exposed on the surface of MnO2 crystals. Our density functional theory (DFT) study reveals that α-MnO2 has higher catalytic activity than β-MnO2 for SCR of NO at relatively low temperature. By using SBA-15 as a template, Ce-doped α-MnO2 (MnCe(0.3)Ox) with an ordered porous structure and high surface area (313 m2 g−1) was synthesized. Transmission electron microscopy, powder X-ray diffraction and Raman spectroscopy were employed to characterize the crystal structure of the α-MnO2 catalyst. The SCR of NO in the presence of NH3 using the MnCe(0.3)Ox catalyst was carried out at relatively low temperature. The NO conversion can approach 100% at 120 °C under a gas hourly space velocity (GHSV) of 160 000 h−1 and at 170 °C under a GHSV of 500 000 h−1. Thus, the present MnCe(0.3)Ox catalyst is expected to overcome the bottlenecks of high energy consumption and short usage age of catalysts in the SCR of NO.

Graphical abstract: Controllable synthesis of Ce-doped α-MnO2 for low-temperature selective catalytic reduction of NO

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Publication details

The article was received on 19 Feb 2017, accepted on 09 Mar 2017 and first published on 10 Mar 2017


Article type: Paper
DOI: 10.1039/C7CY00315C
Citation: Catal. Sci. Technol., 2017,7, 1565-1572
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    Controllable synthesis of Ce-doped α-MnO2 for low-temperature selective catalytic reduction of NO

    Y. Wei, J. Liu, W. Su, Y. Sun and Y. Zhao, Catal. Sci. Technol., 2017, 7, 1565
    DOI: 10.1039/C7CY00315C

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