Selective oxidation of CO in H2-rich stream was studied on iron oxide supported Au catalysts prepared by deposition-precipitation (AuDP) or coprecipitation (AuCP) and for comparison on commercial gold reference catalyst (AuRef), investigating in detail the effect of catalyst pretreatment towards the catalytic performance. On AuDP and AuCP samples CO conversion strongly decreased on increasing calcination temperature. On the AuRef sample the influence of calcination was, instead, less evident. On all tested catalysts a higher reduction temperature resulted in a lower CO conversion, the effect of reduction on catalysts activity exceeding that of calcination. On all samples selectivity towards CO oxidation decreased appreciably on increasing reaction temperature. The dependence of selectivity from pretreatment was negligible.On the basis of characterization data (H2-TPR, XRD, TEM) it was pointed out that …