Effect of the addition of Na to Pt/Al2O3 catalysts for the reduction of NO by C3H8 and C3H6 under lean-burn conditions

被引:32
作者
Vernoux, P [1 ]
Leinekugel-Le-Cocq, AY [1 ]
Gaillard, F [1 ]
机构
[1] Univ Lyon 1, UMR 5634 CNRS, LACE, F-69622 Villeurbanne, France
关键词
selective catalytic reduction; SCR; NOx; propene; propane; platinum; sodium; lean-burn conditions;
D O I
10.1016/S0021-9517(03)00200-8
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
A series of Pt/gamma-Al(2)O(3) catalysts promoted by various concentrations of Na were prepared and tested for the SCR of NO by propene and propane under lean-burn conditions. The addition of Na markedly modifies the Pt catalytic behaviors. Under a C(3)H(8)/NO/O(2) atmosphere, the presence of Na leads to a drastic decrease of the C(3)H(8) and NO conversions. In contrast, under C(3)H(6)/NO/O(2), Na promotion improves the Pt catalytic performance. For high Na loadings (5 wt%), we observed an enhancement of the selectivity to N(2) and a widening of the operating temperature window. The promotional phenomena observed have been explained in terms of modification of the adsorption strengths of the various reactants on the metal surface. The Na effects should be to strengthen the Pt-electron-acceptor (O and NO) bonds and to weaken the Pt-electron-donor (C(3)H(8) and C(3)H(6)) bonds. The opposite effects observed by using propane or propene have been attributed to their different mechanisms of adsorption on Pt. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:247 / 257
页数:11
相关论文
共 50 条
  • [31] Selective catalytic reduction of NO by C3H8 over CoOx/Al2O3:: An investigation of structure-activity relationships
    He, Chuanhua
    Paulus, Martin
    Chu, Wei
    Find, Josef
    Nickl, Julius A.
    Koehler, Klaus
    [J]. CATALYSIS TODAY, 2008, 131 (1-4) : 305 - 313
  • [32] Comparison of dual CO light-off effect on Pt/CeO2/γ-Al2O3, Pd/CeO2/γ-Al2O3, Pt/c-Al2O3 and Pd/γ-Al2O3 in the presence of C3H6
    Brezina, Jan
    Pecinka, Rudolf
    Boutikos, Panagiotis
    Koci, Petr
    [J]. CHEMICAL ENGINEERING SCIENCE, 2020, 218 (218)
  • [33] Infrared study of NO adsorption and reduction with C3H6 in the presence of O2 over CuO/Al2O3
    Chi, YW
    Chuang, SSC
    [J]. JOURNAL OF CATALYSIS, 2000, 190 (01) : 75 - 91
  • [34] Selective catalytic reduction of NO in the presence of excess oxygen I•SCR of NO with C3H6 over Ag/Al2O3
    He, H
    Zhang, RD
    Yu, YB
    Liu, JF
    [J]. CHINESE JOURNAL OF CATALYSIS, 2003, 24 (10) : 788 - 794
  • [35] Lean NOx reduction with CO+H2 mixtures over Pt/Al2O3 and Pd/Al2O3 catalysts
    Macleod, N
    Lambert, RM
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2002, 35 (04) : 269 - 279
  • [36] Spatially resolving CO and C3H6 oxidation reactions in a Pt/Al2O3 model oxidation catalyst
    Hazlett, Melanie J.
    Epling, William S.
    [J]. CATALYSIS TODAY, 2016, 267 : 157 - 166
  • [37] Inverse Hysteresis Phenomena During CO and C3H6 Oxidation over a Pt/Al2O3 Catalyst
    Abedi, Ali
    Hayes, Robert
    Votsmeier, Martin
    Epling, William S.
    [J]. CATALYSIS LETTERS, 2012, 142 (08) : 930 - 935
  • [38] Towards ZIF-8 membranes with superb C3H6/C3H8 separation performances under varying conditions: Necessity of precise temperature control
    Ji, Taotao
    Yan, Jiahui
    He, Yongfu
    Hu, Wenjing
    Peng, Yuan
    Yang, Weishen
    Liu, Yi
    [J]. JOURNAL OF MEMBRANE SCIENCE, 2023, 683
  • [39] Improved performance of NOx reduction by H2 and CO over a Pd/Al2O3 catalyst at low temperatures under lean-burn conditions
    Lee, YW
    Gulari, E
    [J]. CATALYSIS COMMUNICATIONS, 2004, 5 (09) : 499 - 503
  • [40] Effect of Pd dispersion on the catalytic activity of Pd/Al2O3 for C3H6 and CO oxidation
    Haneda, Masaaki
    Todo, Mina
    Nakamura, Yuichiro
    Hattori, Mastomo
    [J]. CATALYSIS TODAY, 2017, 281 : 447 - 453