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Effect of CO2 on the DeNOx Activity of a Small Pore Zeolite Copper Catalyst for NH3/SCR

Authors

  • Young Jin Kim,

    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
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  • Kyung Myung Min,

    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
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  • Jun Kyu Lee,

    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
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  • Prof. Suk Bong Hong,

    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
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  • Prof. Byong K. Cho,

    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
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  • Prof. In-Sik Nam

    Corresponding author
    1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299
    • Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784 (Republic of Korea), Fax: (+82) 54-279-8299===

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Abstract

Exposure of CuSSZ13 to CO2 at temperatures below 300 °C can deactivate its low-temperature deNOx activity during NH3/SCR, with the severity of deactivation being dependent on reaction temperature. The adsorption of NO on Cu2+ ion is inhibited by CO2 due to its competitive adsorption, while NH3 adsorption on acidic sites of CuSSZ13 is largely unaffected by CO2, as evidenced by NO- and NH3-TPD in the presence of CO2. Under O2-rich conditions, CO2 forms unidentate carbonates on Cu2+ sites suppressing the formation of nitrates, a key reaction intermediate essential for NOx reduction during the NH3/SCR reaction, as revealed in an in situ FTIR study.

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