论文部分内容阅读
Methanol synthesis from CO_2 and H_2 over various CuO-ZnO catalystsunder lower pressure has been studied.The properties of CuO-ZnO Catalystschanged with the solution pH value,precipitating agent,coprecipitatingmethod,thermal treating and activation conditions.XRD,BET,and TPR wereused to examine the surface structure and properties of catalysts.When 6.6≤pH≤8.9,copper and zinc cations could completely precipitate simultaneously.The eatalyst with CuO/ZnO wt.ratio of 50/50 has good activity,highmethanol selectivity and methanol yield.Calcination at high temperature andreduction in pure hydrogen would lead up to the decrease in catalytic activity.
Methanol synthesis from CO_2 and H_2 over various CuO-ZnO catalystsunder lower pressure has been studied.The properties of CuO-ZnO Catalystschanged with the solution pH value, precipitating agent, coprecipitatingmethod, thermal treating and activation conditions. XRD, BET, and TPR wereused to examine the surface structure and properties of the catalysts.When 6.6≤pH≤8.9, copper and zinc cations could be completely precipitated simultaneously. The eatalyst with CuO / ZnO wt.ratio of 50/50 has good activity, highmethanol selectivity and methanol yield. Calcination at high temperature andreduction in pure hydrogen would lead up to the decrease in catalytic activity.