Au/La-CeOx catalyst for CO oxidation: effect of different atmospheres pretreatment on gold state ― Commemorating the 100th anniversary of the birth of Academician Guagnxian Xu

ABSTRACT So far, it is still a controversial issue that which status of gold species is a better active site for catalyzing CO oxidation. Herein, the influence of the different atmospheres pretreatment (oxidative and reductive) on gold state of Au/La-CeOx (1 wt % gold loading) catalyst during CO oxidation was studied. The changes of Au species were monitored combined in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) and X-ray photoelectron spectroscopy (XPS). For the sample pretreated with oxidative atmosphere, the data shows that the initial Au3+ is transformed to Auδ+ (0