XPS data from Structure and catalytic behaviour of CuO–CeO₂ prepared by high-energy ball milling

The aim of this study is to prepare CeO₂–CuO composite by means of mechanical milling and to investigate its characteristics as catalyst. The structural and morphological features of milled samples are observed by X-ray diffractometry and scanning electron microscopy. The milled sample is subjected to measurement of the redox property and total OSC (oxygen storage capacity) using GC-TCD and TG-DTA, which are important parameters to indicate the effectiveness of catalysts. Interestingly, reduction of CuO is repeatedly observed when milling of CuO–CeO₂ powder mixture is processed in air. The redox property of milled CuO–CeO₂ sample is investigated by H₂-TPR, where three reduction peaks are observed for 0 h milling and only one broad peak for various other milling times. The total OSC of mechanically driven CuO–CeO₂ catalyst is much higher than that of the CeO₂–ZrO₂ traditional catalyst system at low temperatures.