Kevin Morgan - TAP Studies of CO oxidation over CuMnOx and Au/CuMnOx Catalysts

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  Publication Details (including relevant citation   information):

  Journal of   Catalysis, Volume   276, Issue 1, Pages 38-48 (2010)

  K. Morgan,   K.J. Cole, A. Goguet, C. Hardacre, G.J. Hutchings, N. Maguire,   S.O. Shekhtman, S.H. Taylor


  The mechanism of CO oxidation reactions undoped and gold doped   CuMnOX (Hopcalite) catalysts has been examined using a   temporal analysis of products (TAP) reactor. Gold doping has been   found to increase the activity of the mixed oxide catalyst   significantly; however, using consecutive pulsing TAP experiments   the presence of gold was not found to affect the contribution of   the Langmuir-Hinshelwood mechanism. Conversely, gold doping was   found to promote the Mars van Krevelen mechanism. Using CO and   O2 multi-pulse TAP experiments, the gold was found to   modify the catalyst surface such that it stores much more oxygen   which is active for the CO oxidation. The CO multi-pulse   experiments indicated that two distinct types of active oxygen   species were found to be involved in the CO oxidation. One type   was observed in a similar amount on both doped and undoped   catalysts and was associated with mixed oxide whilst the second   type was only found on the gold doped catalyst and was therefore   clearly associated with the presence of gold on the catalyst   surface. The latter was found to be much less active than the   oxygen inherent to the oxide but was at a concentration of   approximately ten times larger leading to the enhanced activity   observed on gold doping.

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