Effect of particle size on oxidation reaction kinetics parameter of Cu2O powders

The 0.4mol.L-1CuSO4 liquor and 5mol.L-1NaOH liquor were prepared by CuSO4 center dot 5H(2)O and NaOH as raw materials. The Cu2O powders were prepared by dextrose reducer and PVP dispersant. The Cu2O 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 degrees C.min(-1) and deoxidize gas air. The Cu2O 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 Cu2O particle' size. Their frequency factors were 1.22x10(13), 1.40x10(13), 2.88x10(20), the frequency factors increase with particle' size Cu2O. Their reaction progressions were 1.02, 1.00, 0.96, the reaction progression increase with Cu2O particle' size decreased.