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

被引：0
作者：
N. A. Sadokhina
D. E. Doronkin
G. N. Baeva
S. Dahl
A. Yu. Stakheev
机构：
[1] Zelinsky Institute of Organic Chemistry RAS,Department of Physics
[2] Center for Individual Nanoparticle Functionality (CINF),undefined
[3] Technical University of Denmark,undefined
[4] Karlsruhe Institute of Technology,undefined
[5] Haldor Topsøe A/S,undefined
来源：
Topics in Catalysis | 2013年 / 56卷
关键词：
HC-SCR mechanism; (NO; );  reactivity; H; -effect; C; H; NH; Ag/Al; O; SCR;
D O I：
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摘要：
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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页码：737 / 744
页数：7
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