A cyclic reaction pathway triggered by ammonia for the selective catalytic reduction of NOx by ethanol over Ag/Al2O3

被引：31
|
作者：
Yu, Yunbo [1 ]
Zhao, Jiaojiao [1 ]
Yan, Yong [1 ]
Han, Xue [1 ]
He, Hong [1 ]
机构：
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2013年 / 136卷
基金：
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词：
Selective catalytic reduction of NOx; Ammonia; Enolic species; Ag/Al2O3; Isocyanate; SILVER-ALUMINA CATALYSTS; IN-SITU DRIFTS; MECHANISTIC ASPECTS; HIGHER HYDROCARBONS; LEAN REDUCTION; BY-PRODUCTS; SCR; C2H5OH; C3H6; PERFORMANCE;
D O I：
10.1016/j.apcatb.2013.01.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Alumina-supported silver catalysts (Ag/Al2O3) prepared using nordstrandite as a precursor exhibited excellent activity for the selective catalytic reduction of NOx by ethanol (ethanol-SCR). During the ethanol-SCR, the formation of NH3 was observed over all Ag/Al2O3 catalysts, the amount of which was related to silver loading, reaction temperature, and the concentration of ethanol used, even when water was excluded from the inlet gas. Transient activity testing and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis showed that the reaction between isocyanate species (-NCO) and water is the main pathway of NH3 formation. Addition of NH3 enhanced the NOx conversion for ethanol-SCR and the oxidation of ethanol over 3 wt% Ag/Al2O3. DRIFTS analysis revealed for the first time that NH3 reacted with enolic species to form -NCO over Ag/Al2O3, thus resulting in a novel and cyclic reaction pathway for ethanol-SCR. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：103 / 111
页数：9
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