NITRIC-OXIDE REDUCTION AND CARBON-MONOXIDE OXIDATION OVER CARBON-SUPPORTED COPPER CHROMIUM CATALYSTS

被引:64
|
作者
STEGENGA, S [1 ]
VANSOEST, R [1 ]
KAPTEIJN, F [1 ]
MOULIJN, JA [1 ]
机构
[1] UNIV AMSTERDAM,DEPT CHEM ENGN,1018 WV AMSTERDAM,NETHERLANDS
关键词
CARBON MONOXIDE OXIDATION; CARBON SUPPORT; COPPER CHROMIUM CATALYST; EXHAUST GAS PURIFICATION; NITRIC OXIDE REDUCTION;
D O I
10.1016/0926-3373(93)80001-T
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
Carbon supported copper-chromium catalysts are shown to be very active for both the reduction of nitric oxide with carbon monoxide and the oxidation of carbon monoxide with oxygen. Mixed copper chromium oxide active phases have good activity in the simultaneous removal of nitric oxide and carbon monoxide from exhaust gases. The influence of several catalyst variables has been investigated. The activity per volume of catalyst increases with increasing loading, while the intrinsic activity shows a maximum around C/M = 100-50. An optimum catalyst for nitric oxide reduction and carbon monoxide oxidation has a copper/chromium ratio of 2/1. The apparent activation energy for the carbon monoxide oxidation over carbon supported copper-chromium catalysts is 77 kJ/mol, suggesting that the Cu-O bond rupture is the rate-limiting process. The reduction of nitric oxide takes place at higher temperatures. Since all catalysts have a low selectivity for molecular nitrogen formation at lower temperatures, the dissociation of nitric oxide is probably rate determining, resulting in a slightly reduced catalyst system. In an excess of carbon monoxide the reaction is first-order in nitric oxide and zero-order in carbon monoxide. Moisture inhibits the reaction by reversible competitive adsorption, whereas carbon dioxide does not. Oxygen completely inhibits the reduction of nitric oxide due to the more rapid reoxidation of the catalytic sites compared to nitric oxide. Therefore, the reduction of nitric oxide takes place only when all oxygen has been converted and, hence, is shifted to higher temperatures. As a possible consequence, the production of nitrous oxide is reduced. Nitric oxide and molecular oxygen react preferentially with carbon monoxide, so, in an excess of oxidizing component, gasification of the carbon support occurs at higher temperatures after carbon monoxide has been completely consumed.
引用
收藏
页码:257 / 275
页数:19
相关论文
共 50 条
  • [1] REDUCTION OF NITRIC-OXIDE BY CARBON-MONOXIDE ON COPPER CATALYSTS
    REWICK, RT
    WISE, H
    [J]. JOURNAL OF CATALYSIS, 1975, 40 (03) : 301 - 311
  • [2] KINETICS OF OXIDATION OF CARBON-MONOXIDE OVER SUPPORTED COPPER - CHROMIUM-OXIDE CATALYSTS
    TERESHCHENKO, AD
    YUZEFOVICH, GE
    VLASENKO, VM
    [J]. KINETICS AND CATALYSIS, 1977, 18 (06) : 1207 - 1211
  • [3] CALCINATION CONDITIONS ON COPPER ALUMINA CATALYSTS FOR CARBON-MONOXIDE OXIDATION AND NITRIC-OXIDE REDUCTION
    HUANG, TJ
    YU, TC
    [J]. APPLIED CATALYSIS, 1991, 71 (02): : 275 - 282
  • [4] REDUCTION OF NITRIC-OXIDE WITH CARBON-MONOXIDE AND HYDROGEN OVER RUTHENIUM CATALYSTS
    VOORHOEVE, RJH
    TRIMBLE, LE
    [J]. JOURNAL OF CATALYSIS, 1975, 38 (1-3) : 80 - 91
  • [5] REDUCTION OF NITRIC-OXIDE WITH CARBON-MONOXIDE AND HYDROGEN OVER SUPPORTED NOBLE-METAL CATALYSTS
    KOBYLINS.TP
    TAYLOR, BW
    [J]. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1973, (AUG26): : 1 - 1
  • [6] REDUCTION OF NITRIC-OXIDE BY CARBON-MONOXIDE OVER ZIRCONIA-SUPPORTED METAL-OXIDE CATALYSTS
    OKAMOTO, Y
    OHTO, Y
    IMANAKA, T
    [J]. KAGAKU KOGAKU RONBUNSHU, 1993, 19 (05) : 863 - 869
  • [7] Nitric oxide reduction over carbon-supported palladium catalysts
    SalasPeregrin, MA
    Primet, M
    Praliaud, H
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1996, 8 (01) : 79 - 100
  • [8] SIMULTANEOUS INFRARED AND KINETIC STUDY OF REDUCTION OF NITRIC-OXIDE BY CARBON-MONOXIDE OVER COPPER OXIDE
    LONDON, JW
    BELL, AT
    [J]. JOURNAL OF CATALYSIS, 1973, 31 (01) : 96 - 109
  • [9] CATALYTIC REDUCTION OF NITRIC-OXIDE WITH CARBON-MONOXIDE
    KASAOKA, S
    KOBAYASHI, H
    NAGI, H
    INOUE, S
    TSUMAKI, H
    KITAMURA, T
    [J]. NIPPON KAGAKU KAISHI, 1975, (08) : 1410 - 1417
  • [10] CATALYTIC REDUCTION OF NITRIC-OXIDE WITH CARBON-MONOXIDE
    KASAOKA, S
    KOBAYASHI, H
    NAGI, H
    INOUE, S
    TSUMAKI, H
    KITAMURA, T
    [J]. INTERNATIONAL CHEMICAL ENGINEERING, 1977, 17 (02): : 282 - 290