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

被引：8
作者：
Sadokhina, N. A. [1 ]
Doronkin, D. E. [2 ]
Baeva, G. N. [1 ]
Dahl, S. [2 ]
Stakheev, A. Yu. [1 ]
机构：
[1] Zelinsky Inst Organ Chem RAS, Moscow 119991, Russia
[2] Tech Univ Denmark, CINF, Dept Phys, DK-2800 Lyngby, Denmark
来源：
TOPICS IN CATALYSIS | 2013年 / 56卷 / 9-10期
关键词：
HC-SCR mechanism; (NO3-)(surf) reactivity; H-2-effect; C6H14; NH3; Ag/Al2O3; SCR; SELECTIVE REDUCTION; UREA-SCR; SILVER/ALUMINA CATALYST; MECHANISTIC ASPECTS; HIGHER HYDROCARBONS; ALUMINA CATALYSTS; LEAN CONDITIONS; SILVER-ALUMINA; H-2; ADSORPTION;
D O I：
10.1007/s11244-013-0033-2
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The role of nitrate ad-species in H-2-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 H-2 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 similar to 15 times higher, which indicates that the reduction of surface nitrates plays a marginal role in the overall NH3-SCR.
引用
收藏
页码：737 / 744
页数：8
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