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Hydrothermal Aging Effects on Fe/SSZ-13 and Fe/Beta NH3–SCR Catalysts

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Abstract

Fe/SSZ-13 and Fe/beta catalysts with similar Fe loading and Si/Al ratios were prepared via solution ion-exchange under N2. These catalysts, in both freshly prepared and hydrothermally aged forms, were characterized with temperature-programmed reduction/desorption and a few spectroscopic methods to elucidate changes to Fe species and zeolite acidity during hydrothermal aging. The catalytic properties were further studied using standard/fast SCR and NO/NH3 oxidation reactions. For both catalysts, aging causes Fe-ion clustering and Al–Fe interactions. A clear correlation is found between standard NH3–SCR and NO oxidation activities indicating that higher NO oxidation rates enable fast SCR even under standard SCR conditions. For fast SCR, higher pore opening and lower acidity in beta zeolite-based catalysts mitigate NH4NO3 deposition.

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Acknowledgments

The authors gratefully acknowledge the US Department of Energy (DOE), Energy Efficiency and Renewable Energy, Vehicle Technologies Program for the support of this work. The research described in this paper was performed at the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the DOE’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory (PNNL). PNNL is operated for the US DOE by Battelle.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, Institute for Integrated Catalysis, Richland, WA, 99352, USA

    Feng Gao, János Szanyi, Yilin Wang, Birgit Schwenzer, Márton Kollár & Charles H. F. Peden

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  1. Feng Gao
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  2. János Szanyi
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  3. Yilin Wang
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  4. Birgit Schwenzer
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  5. Márton Kollár
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  6. Charles H. F. Peden
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Correspondence to Feng Gao.

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Gao, F., Szanyi, J., Wang, Y. et al. Hydrothermal Aging Effects on Fe/SSZ-13 and Fe/Beta NH3–SCR Catalysts. Top Catal 59, 882–886 (2016). https://doi.org/10.1007/s11244-016-0563-5

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  • DOI: https://doi.org/10.1007/s11244-016-0563-5

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