Reactivity of Surface Nitrates in H2-Assisted SCR of NOx Over Ag/Al2O3 Catalyst

N. A. Sadokhina; Dmitry E. Doronkin; G. N. Baeva; S. Dahl; A. Yu. Stakheev

doi:10.1007/s11244-013-0033-2

Reactivity of Surface Nitrates in H₂-Assisted SCR of NO_x Over Ag/Al₂O₃ Catalyst

N. A. Sadokhina, Dmitry E. Doronkin, G. N. Baeva, S. Dahl, A. Yu. Stakheev

Russian Academy of Sciences

Research output: Contribution to journal › Journal article › Research › peer-review

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-C₆H₁₄at 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.

Original language	English
Journal	Topics in Catalysis
Volume	56
Issue number	9-10
Pages (from-to)	737-744
ISSN	1022-5528
DOIs	https://doi.org/10.1007/s11244-013-0033-2
Publication status	Published - 2013

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@article{1566a4f369c9423b95715028e2bbdef5,

title = "Reactivity of Surface Nitrates in H2-Assisted SCR of NOx Over Ag/Al2O3 Catalyst",

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.",

author = "Sadokhina, {N. A.} and Doronkin, {Dmitry E.} and Baeva, {G. N.} and S. Dahl and Stakheev, {A. Yu.}",

year = "2013",

doi = "10.1007/s11244-013-0033-2",

language = "English",

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TY - JOUR

T1 - Reactivity of Surface Nitrates in H2-Assisted SCR of NOx Over Ag/Al2O3 Catalyst

AU - Sadokhina, N. A.

AU - Doronkin, Dmitry E.

AU - Baeva, G. N.

AU - Dahl, S.

AU - Stakheev, A. Yu.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

U2 - 10.1007/s11244-013-0033-2

DO - 10.1007/s11244-013-0033-2

M3 - Journal article

SN - 1022-5528

VL - 56

SP - 737

EP - 744

JO - Topics in Catalysis

JF - Topics in Catalysis

IS - 9-10

ER -