Mechanism of low-temperature CO oxidation on a model Pd/Fe2O3 catalyst
Catal. Lett., (1999)DOI: 10.1023/A:1019012303143
Abstract
A model Pd/Fe2O3 catalyst prepared by the vacuum technique has been
studied in the carbon monoxide oxidation in the temperature range
of 300�550 K at reagent pressures P(CO)=16 Torr, P(O2)= 4 Torr. It
has been shown that the activity of the fresh catalysts is determined
by palladium. According to the XPS data, the reduction with carbon
monoxide results in the formation of Fe2+ (formally Fe3O4) and appearance
of the catalytic activity in this reaction at low temperatures (350
K). High low-temperature activity of the catalyst is supposed to
be connected with the reaction between oxygen adsorbed on the reduced
sites of the support (Fe2+) and CO adsorbed on palladium (COads)
at the metal�oxide interface.