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Issue 3, 2019
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The synergistic effects between Ce and Cu in CuyCe1−yW5Ox catalysts for enhanced NH3-SCR of NOx and SO2 tolerance

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Abstract

Manganese-based metal oxides are promising catalysts for the NH3-SCR (selective catalytic reduction) of NOx at low temperatures. However, manganese-based catalysts usually exhibit poor SO2 and H2O tolerance. In order to overcome the fatal shortcoming, non-manganese-based CuyCe1−yW5Ox catalysts (y = 0, 0.4, 0.5, 0.6, 1.0) are synthesized successfully by a standard co-precipitation method, and the catalytic performances of these catalysts are tested by the NH3-SCR of NOx. The results show that there are synergistic effects between Cu and Ce, which affect the CuyCe1−yW5Ox catalysts in many aspects, such as the specific surface area, the surface contents of Ce3+ and Cu2+, the reductive strength and the amount of weak and strong acid sites on the surface. Moreover, the synergistic effects also have an impact on the de-NOx mechanism of CuyCe1−yW5Ox catalysts, and finally decide their catalytic performances. Among all the CuyCe1−yW5Ox catalysts, the Cu0.5Ce0.5W5Ox catalyst shows the best catalytic de-NOx performance and good tolerance to SO2 and H2O poisoning. This work may provide a suggestion for the design of non-manganese-based SCR catalysts with the desired de-NOx performance and good SO2 tolerance by making use of the synergistic effects between different metal oxides.

Graphical abstract: The synergistic effects between Ce and Cu in CuyCe1−yW5Ox catalysts for enhanced NH3-SCR of NOx and SO2 tolerance

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Publication details

The article was received on 19 Sep 2018, accepted on 21 Dec 2018 and first published on 26 Dec 2018


Article type: Paper
DOI: 10.1039/C8CY01949E
Citation: Catal. Sci. Technol., 2019,9, 718-730

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    The synergistic effects between Ce and Cu in CuyCe1−yW5Ox catalysts for enhanced NH3-SCR of NOx and SO2 tolerance

    J. Shi, Y. Wang, R. Duan, C. Gao, B. Wang, C. He and C. Niu, Catal. Sci. Technol., 2019, 9, 718
    DOI: 10.1039/C8CY01949E

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