Enhanced Low Temperature NOx Reduction Performance Over Bimetallic Pt/Rh-BaO Lean NOx Trap Catalysts

被引：6
作者：
Andonova, Stanislava [1 ]
Marchionni, Valentina [2 ]
Lietti, Luca [2 ]
Olsson, Louise [1 ]
机构：
[1] Chalmers, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden
[2] Politecn Milan, Dipartimento Energia, Lab Catalysis & Catalyt Proc, I-20133 Milan, Italy
来源：
TOPICS IN CATALYSIS | 2013年 / 56卷 / 1-8期
关键词：
NOx storage; NSR; LNT; Pt; Rh; BaO; Noble metal; TPD; REDUCING AGENT; STORAGE; RH; TRANSIENT; PT/BAO/AL2O3; REGENERATION; PLATINUM; PT/AL2O3; N2O;
D O I：
10.1007/s11244-013-9931-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The overall NSR operation was tested over a bimetallic Pt/Rh-BaO lean NO (x) trap (LNT) catalyst in the range of 473-673 K with simulated diesel exhausts and compared to monometallic 1 wt% Pt/BaO/gamma-Al2O3 and 0.5 wt% Rh/BaO/gamma-Al2O3 samples. The results showed the beneficial effect of the simultaneous presence of 0.5 wt% Pt and 0.25 wt% Rh on the catalytic performance under lean-burn conditions at low temperatures. It was observed that both Pt/BaO/gamma-Al2O3 and Rh/BaO/gamma-Al2O3, which both were mildly aged, have limited NO (x) reduction capacity at 473 K. However, combining Pt and Rh in the NO (x) storage catalyst assisted the NO (x) reduction process to occur at lower temperatures (473 K). One possible reason could be that the combined Pt and Rh sample was more resistant to aging. In addition, the NO2-TPD data showed that the presence of Rh into the Pt/BaO/gamma-Al2O3 system has a considerable effect on the spill-over process of NO (x) , accelerating the release of NO (x) at lower temperatures. These results were in a good agreement with the observed higher rate of oxygen release of the bimetallic Pt/Rh catalyst, leaving a significant number of noble metal sites available for adsorption at lower temperatures than that of the monometallic Pt sample. The superior NSR performance of the bimetallic Pt/Rh/BaO/gamma-Al2O3 catalyst under lean-burn conditions suggested the existence of synergetic promotion effect between the Pt and Rh components, increasing the NO (x) reduction efficiency in comparison with that of the monometallic Pt and Rh-BaO LNT catalysts.
引用
收藏
页码：68 / 74
页数：7
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共 16 条
  • [1] The reduction phase in NOx storage catalysis:: Effect of type of precious metal and reducing agent
    Abdulhamid, H
    Fridell, E
    Skoglundh, M
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 62 (3-4) : 319 - 328
  • [2] Influence of platinum and rhodium composition on the NOx storage and sulphur tolerance of a barium based NOx storage catalyst
    Amberntsson, A
    Fridell, E
    Skoglundh, M
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 46 (03) : 429 - 439
  • [3] Mechanistic investigations of the promoting role of Rh on the NSR performance of NOx storage BaO-based catalysts
    Andonova, Stanislava
    Marchionni, Valentina
    Borelli, Marta
    Nedyalkova, Radka
    Lietti, Luca
    Olsson, Louise
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2013, 132 : 266 - 281
  • [4] Insight into the key aspects of the regeneration process in the NOx storage reduction (NSR) reaction probed using fast transient kinetics coupled with isotopically labelled 15NO over Pt and Rh-containing Ba/Al2O3 catalysts
    Breen, J. P.
    Burch, R.
    Fontaine-Gautrelet, C.
    Hardacre, C.
    Rioche, C.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 81 (1-2) : 150 - 159
  • [5] Identifying critical factors in the regeneration of NOx-trap materials under realistic conditions using fast transient techniques
    Breen, J. P.
    Rioche, C.
    Burch, R.
    Hardacre, C.
    Meunier, F. C.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2007, 72 (1-2) : 178 - 186
  • [6] Mono- and bimetallic Rh and Pt NSR-catalysts prepared by controlled deposition of noble metals on support or storage component
    Buechel, Robert
    Pratsinis, Sotiris E.
    Baiker, Alfons
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2012, 113 : 160 - 171
  • [7] A combined transient and computational study of the dissociation of N2O on platinum catalysts
    Burch, R
    Daniells, ST
    Breen, JP
    Hu, P
    [J]. JOURNAL OF CATALYSIS, 2004, 224 (02) : 252 - 260
  • [8] Overview of the fundamental reactions and degradation mechanisms of NOx storage/reduction catalysts
    Epling, WS
    Campbell, LE
    Yezerets, A
    Currier, NW
    Parks, JE
    [J]. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 2004, 46 (02): : 163 - 245
  • [9] A kinetic study of the reduction of NOx stored on Pt-Ba/Al2O3 catalyst
    Forzatti, P.
    Lietti, L.
    Gabrielli, N.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2010, 99 (1-2) : 145 - 155
  • [10] Detailed kinetic modeling of NOx storage and reduction with hydrogen as the reducing agent and in the presence of CO2 and H2O over a Pt/Ba/Al catalyst
    Lindholm, Anna
    Currier, Neal W.
    Li, Junhui
    Yezerets, Aleksey
    Olsson, Louise
    [J]. JOURNAL OF CATALYSIS, 2008, 258 (01) : 273 - 288
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