Effect of copper precursors on CO oxidation catalyzed by CuO-CeO2 prepared by solvothermal method

In this paper, the CuO–CeO 2 catalyst was prepared by a direct solvothermal method. The effects of different copper salt precursors(copper nitrate, copper acetate, copper sulfate) on the catalytic performance of the prepared catalyst for CO oxidation were investigated. The physical and chemical properties of the prepared catalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, N 2 physical adsorption, inductively coupled plasma-atomic emission spectrometry (ICP-AES), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption analysis of CO (CO-TPD), in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), and temperature-programmed reduction with H 2 (H 2 -TPR). The results show that the CuO–CeO 2 catalyst prepared with copper acetate as precursor (CC-A) exhibits the best catalytic activity for CO oxidation at low temperatures, with T 50 and T 90 values of 62 and 78 °C respectively, which is mainly attributed to its large specific surface area, porevolume, CO adsorption capacity, and large amount and strong reactivity of surface oxygen. However, the CuO–CeO 2 catalyst prepared with copper nitrate as precursor (CC–N) appears better stability and resistance to water or CO 2 poisoning than CC-A. Different copper precursors (copper nitrate, copper acetate, copper sulfate) have different effects on the catalytic performance of CuO-CeO 2 for CO oxidation. The CuO–CeO 2 catalyst prepared with copper acetate shows the best activity, while the counterpart prepared with copper nitrate shows better resistance to water or CO 2 poisoning.