Effect of Particle Size on Oxidation Reaction Kinetics Parameter of Cu<sub>2</sub>O Powders

The 0.4mol•L -1 CuSO 4 liquor and 5mol•L -1 NaOH liquor were prepared by CuSO 4 ·5H 2 O and NaOH as raw materials. The Cu 2 O powders were prepared by dextrose reducer and PVP dispersant. The Cu 2 O oxidation reaction DTA-TG-DTG curves were obtained by SDT 2960 simultaneous DSC-TGA analysis apparatus. The mensuration condition were that rise temperature velocity 15°C·min -1 and deoxidize gas air. The Cu 2 O oxidation reaction kinetics was calculated by DTA-TG-DTG curves data. The results indicate that the cuprous oxide powders shape were spherical, their particle’ sizes were 100,200,1000nm. Their apparent activation energy were 164.38, 175.54, 282.65 KJ·mol -1 , the apparent activation energy increase with Cu 2 O particle’ size. Their frequency factors were 1.22×10 13 , 1.40×10 13 , 2.88×10 20 , the frequency factors increase with particle’ size Cu 2 O. Their reaction progressions were 1.02, 1.00, 0.96, the reaction progression increase with Cu 2 O particle’ size decreased.