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%。
A series of Cu2＋-substituted composite metal oxides LaMnO3 were prepared by the improved amorphous citric precursor method（IACP）,characterized by XRD,IR,BET and SEM,and 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 the crystalline phases of CuO,MnO2 and La2O3 appeared when the amount of copper increased.The aberrations of the B-substituted crystal structure was larger than those of the A-substituted,and the B-subsituted oxides,which showed a better activity than the A-subsituted.Among all the catalysts,LaCu0.3Mn0.7O3 exhibited the highest catalytic activity.Under the temperature of 500 ℃,the conversion of ethanol was 55.18%,and the selectivity of n-butanal and n-butanol was 41.30% and 24.09%,respectively.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2011年第2期135-140,共6页
Fine Chemicals
基金
国家自然科学基金(20763001)
广西自然科学基金(2010GXNSFA013041)~~
关键词
LAMNO3
CU
乙醇
乙醛
正丁醇
正丁醛
催化与分离提纯技术
LaMnO3； Cu； ethanol； acetaldehyde； n-butanol； n-butanal； catalysis,separation and purification technology
