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Nb-Modified CeAlOx Catalyst Used for the Selective Catalytic Reduction of NO by NH3: The Promoting Effect of Nb

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Abstract

A series of Nb modified CeAlOx catalysts were prepared by hydrothermal method and tested in the selective catalytic reduction of NO with NH3. The catalyst with an Nb/Al molar ratio of 1 : 1 exhibited the best catalytic activity and high resistance to sulfur poisoning. Nitrogen adsorption measurements, XRD, NH3-TPD, H2-TPR and XPS analyses as well as in situ DRIFTS technique were applied to characterize the catalysts. The characterization results showed that the introduction of Nb enhanced the redox power and increased surface acidity. Moreover, the modification enriched the catalyst surface with adsorbed Oα and Ce3+ species. In addition, in situ DRIFTS experiments demonstrated that doping with Nb increased catalyst adsorption capacity for NH3 while decreased the adsorption capacity for NO + O2. All of these factors played important roles in improving NH3-SCR performance of the modified catalysts.

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ACKNOWLEDGMENTS

We gratefully acknowledge the financial support of Science Foundation of the Fujian Province (nos. 2017J01568, 2017J01673), the General Project of Fujian Provincial Department of Education (no. JAT160327, JAT170386) and the Scientific Research Foundation of the Fujian University of Technology (grant no. GY-Z14007).

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Authors and Affiliations

  1. Fujian Indoor Environmental Engineering Technology Research Center, 350118 , Fuzhou, China

    R. Shi, R. Feng, X. Lin & L. Dai

  2. Chemical Safety Institute of Fujian University of Technology, 350118 , Fuzhou, China

    R. Shi, R. Feng & L. Dai

  3. College of Ecological Environmental and Urban Construction, Fujian University of Technology, 350118 , Fuzhou, China

    R. Shi, Y. Zhang, B. Yuan, Z. Zheng, L. Ni, R. Feng, X. Lin & L. Dai

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  1. R. Shi
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  2. Y. Zhang
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  3. B. Yuan
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  4. Z. Zheng
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  5. L. Ni
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  8. L. Dai
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Correspondence to R. Shi.

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Shi, R., Zhang, Y., Yuan, B. et al. Nb-Modified CeAlOx Catalyst Used for the Selective Catalytic Reduction of NO by NH3: The Promoting Effect of Nb. Kinet Catal 60, 205–211 (2019). https://doi.org/10.1134/S0023158419020101

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  • DOI: https://doi.org/10.1134/S0023158419020101

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