Effects of precursor concentration on morphologies of Cu2O micro/nanocrystals and properties of CO self-sustained catalytic combustion

The self-sustained catalytic combustion is one of the most effective ways to remove high concentration CO at low temperature. In this paper, Cu2O micro/nanocrystals with different morphologies were successfully synthesized by changing precursor using liquid phase reduction method. obtained characterized SEM, XRD, XPS, H2-TPR and O2-TPD, relationship between performance morphology was analyzed based on CO-TPD-MS activity evaluation results. It found that leads more exposure active crystal planes Cu2O. Compared Cu2O-1 exposing only (1 0 0) planes, Cu2O-5, which 5 times Cu2O-1, exposes 1 planes. Cu2O-9, 9 0), 1) simultaneously. All concentrations can achieve combustion, increases increasing (Cu2O-1 < Cu2O-5 Cu2O-9). results prove unsaturated coordination Cu O enhance corresponding reducibility, adsorption activation gaseous oxygen, consequently promoting oxidation CO2 over Cu2O-9.