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Reactivity of Surface Nitrates in H2-Assisted SCR of NO x Over Ag/Al2O3 Catalyst

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Abstract

The role of nitrate ad-species in H2-assisted SCR over Ag/Al2O3 was compared in NH3-SCR and n-C6H14-SCR processes. It was found that nitrates could be reduced by NH3 or n-C6H14 at similar rates with H2 co-feeding which indicates a common rate-limiting step. However, contributions of surface nitrate reduction to the overall NH3-SCR or n-C6H14-SCR are different as revealed by comparing the rates of nitrate reduction with the rates of steady-state processes. The rate of the steady-state n-C6H14-SCR is virtually identical to the rate of surface nitrate reduction suggesting a significant contribution of the surface nitrates reduction to the overall n-C6H14-SCR process. On the other hand, the steady-state rate of NH3-SCR is by ~15 times higher, which indicates that the reduction of surface nitrates plays a marginal role in the overall NH3-SCR.

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Abbreviations

SCR:

Selective catalytic reduction

ISC:

Isothermal step concentration

ISR:

Isothermal surface reaction

TPD:

Temperature programmed desorption

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Author notes

  1. D. E. Doronkin

    Present address: Karlsruhe Institute of Technology, Engesserstr. 20, 76131, Karlsruhe, Germany

  2. S. Dahl

    Present address: Haldor Topsøe A/S, Nymøllevej 55, 2800, Kongens Lyngby, Denmark

Authors and Affiliations

  1. Zelinsky Institute of Organic Chemistry RAS, Leninsky Prosp. 47, 119991, Moscow, Russia

    N. A. Sadokhina, G. N. Baeva & A. Yu. Stakheev

  2. Department of Physics, Center for Individual Nanoparticle Functionality (CINF), Technical University of Denmark, Fysikvej 307, 2800, Kongens Lyngby, Denmark

    D. E. Doronkin & S. Dahl

Authors
  1. N. A. Sadokhina
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  2. D. E. Doronkin
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  3. G. N. Baeva
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  4. S. Dahl
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  5. A. Yu. Stakheev
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Correspondence to A. Yu. Stakheev.

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Sadokhina, N.A., Doronkin, D.E., Baeva, G.N. et al. Reactivity of Surface Nitrates in H2-Assisted SCR of NO x Over Ag/Al2O3 Catalyst. Top Catal 56, 737–744 (2013). https://doi.org/10.1007/s11244-013-0033-2

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