Preparation and Charactristic Study of PUR and K2ODOPED CoO - ZnO Catalyst

Abstract

The catalyst CoO-ZnO was prepared in the ratio of 50:50for the mixed oxides respectively, by using the co precipitation method of their mixed bicarbonates ,from their nitrates solution using 1M NaHCO3 solution at pH constant = 7, dried at 70°C and calcinations at temperature (450) °C for 3 hours . The doped mixed oxide were prepared by impregnating method with a solution containing different amounts of potassium nitrate (2%,4%,6% and8%) then dried at 100°C ,and added separately to a fixed quantity of cobalt and zinc nitrates that dissolved in smallest amount of distill water sufficient to make paste. The paste was dried at 110°C and then calcind at 450°C for 3 hrs. The amounts of potassium, expressed as K2O. Surface and catalytic properties of the pure and doped catalyst were investigated using XRD, atomic force microscopic AFM techniques. The (AFM) results show that the roughness decreases with increased mixing ratios and wet impregnation method. The degree of crystallite and crystallite size of the produced phase increased progressively as a function of calcinations temperature from 250 to 500°C, but decreased at 600°and 700°.