Enhanced Methane Conversion Under Periodic Operation Over a Pd/Rh Based TWC in the Exhausts from NGVs

被引：32
作者：
Bounechada, D. [1 ]
Groppi, G. [1 ]
Forzatti, P. [1 ]
Kallinen, K. [2 ]
Kinnunen, T. [2 ]
机构：
[1] Politecn Milan, Dipartimento Energia, I-20133 Milan, Italy
[2] Ecocat Oy, Oulu 90620, Finland
来源：
TOPICS IN CATALYSIS | 2013年 / 56卷 / 1-8期
关键词：
Natural gas vehicles; Methane oxidation; Pd-Rh based catalyst; Periodic operation; Lambda oscillations; SUPPORTED PALLADIUM; CHEMISORBED OXYGEN; CATALYTIC-ACTIVITY; OXIDATION; COMBUSTION; REACTIVITY; REDUCTION; EMISSIONS; BEHAVIOR; CERIA;
D O I：
10.1007/s11244-013-9982-8
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The enhancement of methane oxidation performances under periodic operation over a commercial Pd-Rh based three way catalyst (TWC) is investigated at different temperatures. Results confirm that under conditions with periodic oscillating feed around stoichiometry (lambda = 1 +/- A 0.02), higher and more stable CH4 conversion are obtained than under conditions with constant stoichiometric feed. In particular higher CH4 conversion is obtained in the rich part of the cycle than in the lean one, the difference being more pronounced at high temperature. A narrow turning point for the TWC activity is finally observed under slightly rich conditions, which is characterised by a marked increase of CH4 conversion, paralleled by total consumption of O-2 and NO and formation of small amounts of CO, H-2 and NH3. Results suggest that the oxidation state of palladium plays a key role in the observed enhancement of catalyst performances.
引用
收藏
页码：372 / 377
页数：6
相关论文
共 19 条
  • [1] Effect of periodic lean/rich switch on methane conversion over a Ce-Zr promoted Pd-Rh/Al2O3 catalyst in the exhausts of natural gas vehicles
    Bounechada, Djamela
    Groppi, Gianpiero
    Forzatti, Pio
    Kallinen, Kauko
    Kinnunen, Toni
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2012, 119 : 91 - 99
  • [2] Brinkmeier C, 2007, THESIS ICVT STUTTGAR
  • [3] Factors affecting the catalytic activity of Pd/ZrO2 for the combustion of methane
    Carstens, JN
    Su, SC
    Bell, AT
    [J]. JOURNAL OF CATALYSIS, 1998, 176 (01) : 136 - 142
  • [4] Reactivity of Chemisorbed Oxygen Atoms and Their Catalytic Consequences during CH4-O2 Catalysis on Supported Pt Clusters
    Chin, Ya-Huei
    Buda, Corneliu
    Neurock, Matthew
    Iglesia, Enrique
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2011, 133 (40) : 15958 - 15978
  • [5] Elementary Steps, the Role of Chemisorbed Oxygen, and the Effects of Cluster Size in Catalytic CH4-O2 Reactions on Palladium
    Chin, Ya-Huei
    Iglesia, Enrique
    [J]. JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (36) : 17845 - 17855
  • [6] Catalytic combustion of methane over palladium-based catalysts
    Ciuparu, D
    Lyubovsky, MR
    Altman, E
    Pfefferle, LD
    Datye, A
    [J]. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 2002, 44 (04): : 593 - 649
  • [7] Methane combustion activity of supported palladium catalysts after partial reduction
    Ciuparu, D
    Pfefferle, L
    [J]. APPLIED CATALYSIS A-GENERAL, 2001, 218 (1-2) : 197 - 209
  • [8] Three-way catalyst emissions control technologies for spark-ignition engines - recent trends and future developments
    Collins, Neil R.
    Twigg, Martyn V.
    [J]. TOPICS IN CATALYSIS, 2007, 42-43 (1-4) : 323 - 332
  • [9] CATALYTIC CHEMISTRY OF SUPPORTED PALLADIUM FOR COMBUSTION OF METHANE
    FARRAUTO, RJ
    HOBSON, MC
    KENNELLY, T
    WATERMAN, EM
    [J]. APPLIED CATALYSIS A-GENERAL, 1992, 81 (02) : 227 - 237
  • [10] Structure and reactivity of PdOx/ZrO2, catalysts for methane oxidation at low temperatures
    Fujimoto, K
    Ribeiro, FH
    Avalos-Borja, M
    Iglesia, E
    [J]. JOURNAL OF CATALYSIS, 1998, 179 (02) : 431 - 442
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