Catalysis Letters

, Volume 34, Issue 3–4, pp 313–320 | Cite as

Oscillations of CO and CO + H2 oxidation in air over supported and unsupported Pt catalysts

  • Y. Q. Deng
  • T. C. Novell
  • M. G. Jones
Article

Abstract

Oscillation behaviour of the oxidation of CO (0.2–2.2%) in air over Pt wire coils and over Pt/Al2O3 catalysts deposited onto the coils (pellistors) has been investigated. The waveforms differ considerably between the two catalytic systems. Over unsupported Pt at 240–260° C, regular oscillations were accompanied by slowly declining activity and by deposition of carbon. Over supported Pt at 110–180°C, relatively complex but sustained oscillation occurred by a different mechanism. This oscillation was greatly enhanced by H2 (0.25–1.0%), and may involve fluctuations in the concentrations of CO and H2 around the supported catalyst.

Keywords

oscillation CO + H2 cooxidation chemical sensor pellistor platinum platinum/alumina 

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References

  1. [1]
    J. Rathousky and V. Hlavacek, J. Catal. 75 (1982) 122.Google Scholar
  2. [2]
    D.T. Lynch and S.E. Wanke, J. Catal. 88 (1984) 333.Google Scholar
  3. [3]
    H. Okamoto, G. Kawamura and T. Kudo, J. Catal. 87 (1984) 1.Google Scholar
  4. [4]
    D.J. Kaul and E.E. Wolf, J. Catal. 93 (1985) 321.Google Scholar
  5. [5]
    R. Imbihl, M.P. Cox and G. Ertl, J. Chem. Phys. 84 (1986) 3519.Google Scholar
  6. [6]
    L.F. Razon and R.A. Schmitz, Catal. Rev. Sci. Eng. 28 (1986) 89.Google Scholar
  7. [7]
    R. Sant and E.E. Wolf, J. Catal. 110 (1988) 249.Google Scholar
  8. [8]
    P.K. Tsai, M.B. Maple and R.K. Herz, J. Catal. 113 (1988) 453.Google Scholar
  9. [9]
    J. Kapicka and M. Marke, J. Catal. 119 (1989) 508.Google Scholar
  10. [10]
    J.C. Kellow and E.E. Wolf, Chem. Eng. Sci. 45 (1990) 2597.Google Scholar
  11. [11]
    H.H. Rotermund, W. Engel, M. Kordesch and G. Ertl, Nature 343 (1990) 355.Google Scholar
  12. [12]
    P.K. Tsai, M.G. Wu and M.B. Maple, J. Catal. 127 (1991) 512.Google Scholar
  13. [13]
    M. Ehsasi, M. Berdau, A. Karpowicz, K. Christmann and J.H. Block, in:Proc. 10th Int. Congr. on Catalysis, Budapest, 19–24 July 1992, eds. L. Guczi, F. Solymosi and P. Tétényi (Akadémiai Kiadó, Budapest, 1993) p. 321.Google Scholar
  14. [14]
    K.K. Tenchev, L.A. Petrov, G.A. Savelieva and A.S. Sass, Appl. Catal. 83 (1992) 31.Google Scholar
  15. [15]
    F. Schüth, B.E. Henry and L.D. Schmidt, Adv. Catal. 39 (1993) 51.Google Scholar
  16. [16]
    S.K. Scott,Chemical Chaos (Clarendon Press, Oxford, 1991) chs. 9, 10.Google Scholar
  17. [17]
    J.E. Turner and M.B. Maple, Surf. Sci. 147 (1984) 647.Google Scholar
  18. [18]
    N. Hartmann, R. Imbihl and W. Vogel, Catal. Lett. 28 (1994) 373.Google Scholar
  19. [19]
    V.A. Burrows, S. Sundaresan, Y.J. Chabal and S.B. Chrismann, Surf. Sci. 180 (1987) 110.Google Scholar
  20. [20]
    N.A. Collins, S. Sundaresan, Y.J. Chabal and S.B. Christnann, Surf. Sci. 180 (1987) 136.Google Scholar
  21. [21]
    F. Schüth and E. Wicke, Ber. Bunsenges. Phys. Chem. 93 (1989) 191.Google Scholar
  22. [22]
    S.B. Schwartz and L.D. Schmidt, Surf. Sci. 206 (1988) 169.Google Scholar
  23. [23]
    L. Lobban and D. Luss, J. Phys. Chem. 93 (1989) 6530.Google Scholar
  24. [24]
    L. Lobban, G. Philippan and D. Luss, J. Phys. Chem. 93 (1989) 773.Google Scholar
  25. [25]
    S.B. Schwartz and L.D. Schmidt, Surf. Sci. 206 (1988) 169.Google Scholar
  26. [26]
    M. Sheintuch and D. Luss, J. Catal. 68 (1981) 245.Google Scholar
  27. [27]
    P. Varghese, J.J. Carberry and E.E. Wolf, J. Catal. 55 (1978) 76.Google Scholar
  28. [28]
    T. Lamb, R.P. Scott, P. Watts, B. Holland, S.J. Gentry and A. Jones, J. Chem. Soc. Chem. Commun. (1977) 882.Google Scholar
  29. [29]
    P.T. Moseley and B.C. Tofifld, eds.,Solid State Gas Sensors (Hilger, Bristol, 1987) p. 17.Google Scholar
  30. [30]
    S.J. Gentry, in:Chemical Sensors, ed. Te Edmonds (Blackie, Glasgow, 1988) p. 259.Google Scholar
  31. [31]
    Y.Q. Deng, T.G. Nevell, R.J. Ewen, C.L. Honeybourne and M.G. Jones, Appl. Catal. A 101 (1993) 51.Google Scholar
  32. [32]
    M.G. Jones and T.G. Nevell, Sensors and Actuators 16 (1989) 215.Google Scholar
  33. [33]
    M.G. Jones and T.G. Nevell, J. Catal. 122 (1990) 219.Google Scholar
  34. [34]
    R.C. Yeats, J.E. Turner, A.J. Gellman and G.A. Somorjai, Surf. Sci. 149 (1985) 175.Google Scholar
  35. [35]
    P. Varghese, J.J. Carberry and E.E. Wolf, J. Catal. 55 (1978) 76.Google Scholar
  36. [36]
    N.A. Boldreva and V.K. Yatsimirsky, in:Proc. 10th Int. Congr. on Catalysis, Budapest, 9–24 July 1992, eds. L. Guczi, F. Solymosi and P. Tétényi (Akadémiai Kiadó, Budapest, 1993) p. 2621.Google Scholar
  37. [37]
    D.W. Dabill, S.J. Gentry, H.B. Holland and A. Jones, J. Catal. 53 (1978) 164.Google Scholar

Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • Y. Q. Deng
    • 1
  • T. C. Novell
    • 1
  • M. G. Jones
    • 2
  1. 1.Division of ChemistryUniversity of PortsmouthPortsmouthUK
  2. 2.City Technology LtdPortsmouthUK

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