The effect of sodium bicarbonate concentration onprecursor phases during aging process

Binary Cu/ZnO catalysts were prepared with the similar mole ratio Cu and Zn by a coprecipitation method. The suspension was analyzed at different moments during the aging process: pH drop, color transition, at the constant pH in the range of 7.15 -7.30 and final aging time. XRD analysis indicated the composition changes with the aging time. Aging time, pH solution and carbonate to nitrate ratio in precursors preparation are critical parameters. With increasing aging time in lower pH, Zn2+ incorporation in the malachite increases, therefore,the final activity of catalysts increase

Keywords:

Co-precipitation , pH drop , XRD analysis , aging time , precursors , final activity