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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SEM对催化剂进行了表征,无氧条件下考察该催化剂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%。
The copper partially substituted LaMnO3 catalyst was prepared by the improved citric acid complexation method. The catalysts were characterized by XRD, IR, BET and SEM. The catalytic activity of the catalyst on anhydrous ethanol was investigated under anaerobic conditions. The results show that the structure of perovskite can be maintained after Cu2 + partial substitution. With the increase of copper content, CuO, MnO2 and La2O3 phases appear. The substitution of B site for A is larger than that of A site, and the catalytic activity is higher than that of A site. The catalytic activity of LaCu0.3Mn0.7O3 was the best among all the catalysts. The conversion of ethanol at 500 ℃ was 55.18%, the selectivity to n-butyraldehyde was 41.30% and the selectivity to n-butanol was 24.09%.