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SCR of Nitric Oxide by Hydrogen over Pd and Ir Based Catalysts with Different Supports

Catalysis Letters volume 145, pages 1491–1499 (2015)Cite this article

Abstract

Selective catalytic reduction of NOx with hydrogen (H2-SCR) in excess oxygen over Pd and Ir based catalysts with various silica supports was studied. The Pd/V2O5/TiO2/SBA-15 and Ir/SBA-15 catalysts showed the highest activities. The effects of noble metal, various silica supports, CO and SO2 on H2-SCR over these catalysts were also studied and compared, and possible underlying mechanisms discussed. A comparison of 1 % Ir-doped on silicas with a wide range of pore sizes showed that the peak temperature (where the NO conversion maximum was located) was directly related to the pore size: larger pores of the support resulted in higher peak temperatures. This result indicates that pore diffusion limitation played a role in determining the peak temperature. In addition, a non-noble metal catalyst, Nb2O5/SiO2, was found to have considerable activity.

Graphical Abstract

Larger pores of the support resulted in higher peak temperatures, which indicated that pore diffusion limitation played a direct role.

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Acknowledgments

The authors thank Air Products and Chemicals for funding of this project.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Chengyang Yin, Lifeng Wang, Arthur J. Shih & Ralph T. Yang

  2. Air Products and Chemicals, Inc., 7201 Hamilton Blvd., Allentown, PA, 18195, USA

    Sandrine Rivillon

Authors
  1. Chengyang Yin
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  2. Lifeng Wang
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  3. Sandrine Rivillon
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  4. Arthur J. Shih
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  5. Ralph T. Yang
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Correspondence to Ralph T. Yang.

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Yin, C., Wang, L., Rivillon, S. et al. SCR of Nitric Oxide by Hydrogen over Pd and Ir Based Catalysts with Different Supports. Catal Lett 145, 1491–1499 (2015). https://doi.org/10.1007/s10562-015-1560-1

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  • DOI: https://doi.org/10.1007/s10562-015-1560-1

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