Effect of particle size on hydrogen reduction reaction kinetics parameters 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 DTA-TG-DTG curves obtaining is by SDT 2960 Simultaneous DSC-TGA analysis apparatus. The mensuration condition that rise temperature velocity was 15 degrees C.min(-1) and reduction reaction gas was N-2 and H-2 admixture gas. The kinetics was analysed by DTA-TG-DTG curves. The result indicate that form of CuO was sphericity, the CuO granularity was about 100,200,1000nm. The apparent activation energy leave each other 165.24,247.65,327.01 KJ.mol(-1), increase with granularity Cu2O. The frequency gene leave each other 1.22x10(16) ,2.84x10(22) ,1.41x10(30), increase with granularity Cu2O. The reaction progression leave each other 1.20,1.12,1.05, decrease with granularity Cu2O.