Abstract
The interaction of CO with two alumina-supported palladium catalysts has been investigated by a combination of temperature-programmed desorption (TPD), adsorption isotherms and temperature-programmed oxidation (TPO). In agreement with numerous other studies on this adsorption system, both CO and substantial quantities of CO 2 are seen in the desorption spectra. Replacement of 12C 16O with 13C 18O as the dosing gas showed the CO 2 signal not to originate from either the Boudouard reaction or the oxidation of alumina hydroxyl groups, as has been previously reported. Rather, the CO 2 signal is attributed to the decomposition of carboxy species associated with the alumina support material. TPO experiments demonstrate that the support can make a substantial contribution to the TPO profile, complicating the use of this technique to evaluate carbon retention by finely divided metal particles. Further ‘blank’ TPD experiments on plain alumina indicate the formation of CO 2 in the TPD spectrum to be metal-mediated.
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