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Barium-promoted hydrothermal stability of monolithic Cu/BEA catalyst for NH3-SCR

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Abstract

As a promising candidate for NOx elimination from the emission of diesel engines, the enhancement effect of Ba on the hydrothermal stability of cordierite supported CuBa/BEA at 600 °C for 48 h was investigated by XRD, NH3-TPD, H2-TPR, XPS, EPR, TEM and in situ DRIFTS. Different properties and amounts of active species are significant factors contributing to the enhanced hydrothermal stability of CuBa/BEA-HT. CuBa/BEA-HT has more Cu2+/Cu+ redox-couples and stronger interactions than Cu/BEA-HT, indicating an excellent redox property of the active species in CuBa/BEA-HT. The better redox property of CuBa/BEA-HT produces more nitrates that easily participate in the NH3-SCR reaction, which enhances the low-temperature activity. Furthermore, as observed from EPR and H2-TPR, the appearance of more isolated Cu2+ species and fewer CuO species also contribute to the higher hydrothermal stability of CuBa/BEA-HT.

Graphical abstract: Barium-promoted hydrothermal stability of monolithic Cu/BEA catalyst for NH3-SCR

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Publication details

The article was received on 02 Aug 2018, accepted on 25 Sep 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT03156H
Citation: Dalton Trans., 2018, Advance Article
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    Barium-promoted hydrothermal stability of monolithic Cu/BEA catalyst for NH3-SCR

    Q. Lin, J. Liu, S. Liu, S. Xu, C. Lin, X. Feng, Y. Wang, H. Xu and Y. Chen, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT03156H

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