Advertisement

Reaction Kinetics and Catalysis Letters

, Volume 90, Issue 2, pp 389–399 | Cite as

Surface species and gas phase products in the preferential oxidation of CO on TiO2-supported Au-Rh bimetallic catalysts

  • János Raskó
  • János Kiss
Article

Abstract

The oxidation of CO in the presence of hydrogen (PROX process) was investigated on bimetallic Au-Rh catalysts at 300–373 K by Fourier transform infrared spectroscopy and mass spectroscopy. The effects of catalyst composition, reaction temperature and composition of the reacting gas mixtures have been studied. The IR studies revealed the formation of bi- and monodentate carbonates, bicarbonates and hydrocarbonates on the catalysts surfaces; these surface species proved to be not involved in the surface reactions. The formation of adsorbed formaldehyde was observed on all surfaces, except 1% (0.25Au+0.75Rh)/TiO2. Adsorbed CO2 (as the surface product of CO oxidation) was not detected on any surface. The presence of both O2 and H2 reduced the surface concentration of CO adsorbed on the metallic sites. Mass spectroscopic analysis of the gas phase showed that gaseous CO2 was formed in the highest amount in the CO+O2 mixture, the presence of H2 suppressed the amount of CO2 produced. This negative effect of H2 was the lowest on the 1% Rh/TiO2 and 1% (0.25Au+0.75Rh)/TiO2 catalysts.

Keywords

PROX of CO bimetallic Au-Rh catalysts FTIR mass spectroscopy surface species gas phase products 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J.N. Armor: Appl. Catal., 176, 159 (1999).CrossRefGoogle Scholar
  2. 2.
    F. Aupretre, C. Descorme, D. Duprez: Catal. Commun., 3, 263 (2002).CrossRefGoogle Scholar
  3. 3.
    A.J. Appleby, F.R. Foulkes: Fuel Cell Handbook, Van Nostrand Reinhold, New York, 1989.Google Scholar
  4. 4.
    G. Avgouropoulos, T. Ioannides, Ch. Papadopoulou, J. Battita, S. Hocevar, H.K. Martalis: Catal. Today, 75, 157 (2002).CrossRefGoogle Scholar
  5. 5.
    G.K. Bethke, H.H. Kung: Appl. Catal., 194, 43 (2000).CrossRefGoogle Scholar
  6. 6.
    M.J. Kahlich, H. Gasteiger, R.J. Behm: J. Catal., 182, 430 (2000).CrossRefGoogle Scholar
  7. 7.
    M.M Schubert, M.J. Kahlich, H. Gasteiger, R.J. Behm: J. Power Sources, 84, 175 (1999).CrossRefGoogle Scholar
  8. 8.
    M. Haruta, T. Kobayashi, S. Iijama, F. Delannay: Proc. 9th Int. Congr. Catal., 3, 1206 (1988).Google Scholar
  9. 9.
    D. Cunningham, S. Tsubota, N. Kamijo, M. Haruta: Res. Chem. Intermed., 19, 1 (1993).Google Scholar
  10. 10.
    M.A. Bollinger, M.A. Vannice: Appl. Catal. B: Environmental, 8, 417 (1996).CrossRefGoogle Scholar
  11. 11.
    A. Wootsch, C. Descorme, D. Duprez: J. Catal., 225, 259 (2004).CrossRefGoogle Scholar
  12. 12.
    O. Pozdnyakova, D. Teschner, A. Wootsch, J. Krönert, B. Steinhauer, H. Sauer, L. Tóth, F.C. Jenthoft, A. Knop-Gericke, Z. Paál, R. Schlögl: J. Catal., 237, 1 (2006).CrossRefGoogle Scholar
  13. 13.
    O. Pozdnyakova, D. Teschner, A. Wootsch, J. Krönert, B. Steinhauer, H. Sauer, L. Tóth, F.C. Jenthoft, A. Knop-Gericke, Z. Paál, R. Schlögl: J. Catal., 237, 17 (2006).CrossRefGoogle Scholar
  14. 14.
    S. Lin, M.A. Bollinger, M.A. Vannice: Catal. Lett., 17, 245 (1993).CrossRefGoogle Scholar
  15. 15.
    G. Avgouropoulus, T. Ioannides: Appl. Catal. B: Environmental, 56, 77 (2005).CrossRefGoogle Scholar
  16. 16.
    S. Zhou. K. McIlwrath, G. Jackson, B. Eichhorn: J. Am. Chem. Soc., 126, 1780 (2006).CrossRefGoogle Scholar
  17. 17.
    J. Raskó, Z. Szabó, T. Bánsági, F. Solymosi: Phys. Chem. Chem. Phys., 3, 4437 (2001).CrossRefGoogle Scholar
  18. 18.
    T. Kecskés, J. Raskó, J. Kiss: Appl. Catal. A: General, 273, 55 (2004).CrossRefGoogle Scholar
  19. 19.
    J. Raskó, J. Kiss: Catal. Lett., 111, 87 (2006).CrossRefGoogle Scholar
  20. 20.
    F. Boccuzzi, A. Chiorino, M. Manzoli, D. Andreeva, T. Tabakova: J. Catal., 188, 176 (1999).CrossRefGoogle Scholar
  21. 21.
    J. Raskó, J. Kiss: Reakt. Kinet. Catal. Lett., 90, 187 (2007).CrossRefGoogle Scholar
  22. 22.
    F. Boccuzzi, A. Chiorino, S. Tsubota, M. Haruta: J. Phys. Chem., 100, 3625 (1996).CrossRefGoogle Scholar
  23. 23.
    B.-K. Chang, B.W. Jang, S. Dai, S.H. Overbury: J. Catal., 236, 392 (2005).CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó 2007

Authors and Affiliations

  1. 1.Reaction Kinetics Research Group, Chemical Research Center of the Hungarian Academy of SciencesUniversity of SzegedSzegedHungary

Personalised recommendations