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The Effect of NO2/NO x Feed Ratio on the NH3-SCR System Over Cu–Zeolites with Varying Copper Loading

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Abstract

In this study we examine the NO/NO2–NH3-SCR system over Cu–BEA with varying Cu loading. Significantly higher selective catalytic reduction (SCR) activity is observed at low temperature on highly loaded copper samples, whereas the reverse trend is noticed at high temperature. The N2O formation is substantially increased over “over-exchanged” Cu sites, where Cu co-ordinate to one Al and charge-balanced with one OH-group. This is also the case for NO2 reaction with NH3 to produce NO. Using transient experiments the formation/decomposition of ammonium nitrate species are examined. The decomposition depends on the temperature, the sequence of the feed as well as the type of copper species present.

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Acknowledgments

This study was performed within the Competence Centre for Catalysis, Chemical Engineering at Chalmers University and Cummins Inc. The financial support of Cummins Inc. and the Swedish Foundation for Strategic Research (F06-0006) are gratefully acknowledged.

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Authors and Affiliations

  1. Chemical Engineering; Competence Centre for Catalysis, Chalmers University of Technology, 412 96, Göteborg, Sweden

    Oana Mihai, Catur R. Widyastuti & Louise Olsson

  2. Cummins Inc, 1900 McKinley Avenue, MC 50183, Columbus, IN, 47201, USA

    Ashok Kumar, Junhui Li, Saurabh Y. Joshi, Krishna Kamasamudram, Neal W. Currier & Aleksey Yezerets

  3. Petroleum Processing Engineering and Environmental Protection Department, Petroleum-Gas University of Ploiesti, 39 Bucuresti Bd., 100680, Ploiesti, Romania

    Oana Mihai

Authors
  1. Oana Mihai
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  2. Catur R. Widyastuti
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  3. Ashok Kumar
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  4. Junhui Li
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  5. Saurabh Y. Joshi
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  6. Krishna Kamasamudram
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  7. Neal W. Currier
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  8. Aleksey Yezerets
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  9. Louise Olsson
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Correspondence to Louise Olsson.

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Mihai, O., Widyastuti, C.R., Kumar, A. et al. The Effect of NO2/NO x Feed Ratio on the NH3-SCR System Over Cu–Zeolites with Varying Copper Loading. Catal Lett 144, 70–80 (2014). https://doi.org/10.1007/s10562-013-1133-0

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  • DOI: https://doi.org/10.1007/s10562-013-1133-0

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