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用改进的柠檬酸络合法制备了由稀土与过渡金属组成的复合氧化物La0.6CuxMn1-xO3。通过XRD考察了复合物的物相组成。结果表明,当x≤0.3时,可形成单相的钙钛矿结构;当x>0.3时,过量的Cu以CuO形式存在。通过它们对乙醇的催化反应考察了其催化活性。结果表明,该复合物能催化乙醇生成苯、乙酸乙酯等。当x=0.2、反应温度为400℃、乙醇流量为0.10mL/min时,复合氧化物的催化效果最好,乙醇转化率为35.56%,苯的选择性为13.05%。
A complex oxide La0.6CuxMn1-xO3 consisting of rare earth and transition metal was prepared by the improved citrate complexation method. The phase composition of the composite was investigated by XRD. The results show that when x≤0.3, single-phase perovskite structure can be formed. When x> 0.3, excess Cu exists as CuO. Their catalytic activity was investigated by their catalytic effect on ethanol. The results show that the compound can catalyze ethanol to generate benzene, ethyl acetate and the like. When x = 0.2, the reaction temperature was 400 ℃ and the ethanol flow rate was 0.10mL / min, the catalytic activity of the composite oxide was the best. The conversion of ethanol was 35.56% and the selectivity of benzene was 13.05%.