Controlled Synthesis Of Copper -Manganese Oxide Catalyst Derived From Basic Copper Acetate Precursor

In this paper, basic copper acetate (Cu₂(OH)₃(OCOCH₃)·H₂O) was prepared by the co-precipitation method and hydrothermal method ,which based upon copper acetate was the raw material and sodium hydroxide was the precipitating agent, and then the ion-exchange method was used to the preparation of Cu-Mn Based catalyst with basic copper acetate as precursor. The synthesized samples were characterized by XRD, TG-DTA, SEM, TEM, H2-TPR , low temperature nitrogen absorption and Micro-Reactor-Chromatography. The effect of prepared of basic copper acetate was M[OH^-]/M[Cu²⁺] molar ratios and the effect of texture and catalytic activity of copper manganese oxide was the calcinations temperature.The study of synthesis of basic copper acetate showed that the crystallizations of basic copper acetate structure could be affecting on M[OH^-]/M[Cu²⁺] molar ratios. At M [OH^-] / M [Cu²⁺] = 0.8¹.7 and pH = 6.29⁷.33, basic copper acetate could be obtained, and M[OH^-] / M [Cu(²+)] = 1.2, the crystallizations of basic copper acetate was best. The results of Scanning Electron Microscopy showed that basic copper acetate was a rounded particle size about 7μm , and this particle was made up of stacked layers that was made of basic copper acetate and were cabbage-like.The study of synthesis of Copper manganese oxide showed that the influence of baking temperature to the copper manganese oxide was considerable. The results of XRD and TG-DTA showed that the main crystal phase of Copper manganese oxide was CuO at baking temperature of 400℃and CuO and CuMn₂O₄ at baking temperatures of 600℃and 800℃, and then main crystal phase of Copper manganese oxide were CuO and Cu₂O at baking temperature of 400℃. The results of TPR showed that with the baking temperature increased, combination of Cu-Mn became stronger and reduction temperature moved in the high temperature zone. The results of activity tests showed that the influence of the high baking temperature to the activity of alkaline manganese was considerable, the activity of copper manganese oxide at baking temperature of 1000℃was the best and its activity attained to 82% at reaction temperature of 300℃...