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：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
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
相关论文
共 50 条
  • [1] Application of NOx selective catalytic reduction by ethanol over Ag/Al2O3 catalyst
    Dong, Hong-Yi
    Shuai, Shi-Jin
    Li, Ru-Long
    Wang, Jian-Xin
    Shi, Xiao-Yan
    He, Hong
    Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines), 2007, 25 (06): : 532 - 538
  • [2] Hydrogen promotes the selective catalytic reduction of NOx by ethanol over Ag/Al2O3
    Zhang, Xiuli
    He, Hong
    Ma, Zichuan
    CATALYSIS COMMUNICATIONS, 2007, 8 (02) : 187 - 192
  • [3] The selective catalytic reduction of NOx over Ag/Al2O3 with isobutanol as the reductant
    Brookshear, D. William
    Pihl, Josh A.
    Toops, Todd J.
    West, Brian
    Prikhodko, Vitaly
    CATALYSIS TODAY, 2016, 267 : 65 - 75
  • [4] Selective catalytic reduction of NOx over Ag/Al2O3 catalyst by hydrocarbons
    He, Hong
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2007, 233
  • [5] Study of NOx selective catalytic reduction by ethanol over Ag/Al2O3 catalyst on a HD diesel engine
    Dong, Hongyi
    Shuai, Shijin
    Li, Rulong
    Wang, Hanxin
    Shi, Xiaoyan
    He, Hong
    CHEMICAL ENGINEERING JOURNAL, 2008, 135 (03) : 195 - 201
  • [6] Selective catalytic reduction of NOx by ethanol over combined catalyst Ag/Al2O3-Cu/Al2O3 in excess oxygen
    Zhang, CB
    Shi, XY
    He, H
    CHINESE JOURNAL OF CATALYSIS, 2005, 26 (08) : 645 - 649
  • [7] Effect of Ammonia on the Intermediates and Chemical Pathway of Selective Catalytic Reduction of NO by Ethanol over a Pt/Al2O3 Catalyst
    Chen, Hanyu
    He, Qigeng
    Li, Mingzhen
    Wang, Xi
    ENERGY & FUELS, 2022, 36 (16) : 9230 - 9242
  • [8] NOx storage during H2 assisted selective catalytic reduction of NOx reaction over a Ag/Al2O3 catalyst
    Breen, J. P.
    Burch, R.
    Hill, C. J.
    CATALYSIS TODAY, 2009, 145 (1-2) : 34 - 37
  • [9] Selective catalytic reduction of NOx over Ag/Al2O3 catalyst:: from reaction mechanism to diesel engine test
    He, H
    Yu, YB
    CATALYSIS TODAY, 2005, 100 (1-2) : 37 - 47
  • [10] A Kinetic Model of the Hydrogen Assisted Selective Catalytic Reduction of NO with Ammonia over Ag/Al2O3
    Tamm, Stefanie
    Olsson, Louise
    Fogel, Sebastian
    Gabrielsson, Par
    Skoglundh, Magnus
    AICHE JOURNAL, 2013, 59 (11) : 4325 - 4333
12345