Cu部分取代LaMnO3催化剂上乙醇制备正丁醛和正丁醇的催化性能的研究

The performance of ethanol to n-butanal and n-butanol over the Cu-substituted LaMnO3 catalyst

摘要:

采用改进的柠檬酸络合法制备了铜部分取代的LaMnO3催化剂，用XRD、IR、BET和SCM对催化剂进行了表征，无氧条件下考察它们对无水乙醇的催化反应活性。结果表明，Cu2+部分取代后都能保持钙钛矿结构，随铜量增加，出现CuO、MnO2、La2O3等物相。B位取代比A位取代晶体结构畸变大，催化活性高于A位取代。所有催化剂中LaCu0.3Mn0.7O3的催化反应活性最佳，500℃乙醇的转化率为55.18%，正丁醛的选择性为41.30%，正丁醇的选择性为24.09%。

Abstract:

Ａ series of Cu2+-substituted composite metal oxides LaMnO3 were prepared by improved amorphous citric precursor method(IACP)， characterized by XRD ,IR,BET and SCM , tested the performance of ethanol to n-butanol and n-butanal without oxygen. The results showed that the Cu2+-substituted products could reserve the perovskite-type crystal structure, and crystalline phases of CuO, MnO2 and La2O3 appeared when the amount of copper increased. The aberrations of B-substituted crystal structure was larger than that A -substituted ,and B-subsituted oxides which showed better activity than the A-subsituted. Among all the catalysts, LaCu0.3Mn0.7O3 exhibited the highest catalytic activity. Under the tempereture of 500℃, the conversation of ethanol was 55.18%, and the selectivity of n-butanal and n-butanol was 41.30% and 24.09%, respectively.