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研究了低成本和环保的层状锰氧化物对乙醇氧化的催化作用,通过X射线衍射、N2吸附和扫描电镜等对催化剂进行表征,考察溶剂、反应温度、氧化剂用量、催化剂用量、溶剂用量和反应时间等对乙醇催化氧化制乙醛的影响。结果表明,制备的Ca_(0.16)MnO_2·2H_2O呈疏松多孔的层状结构,在氧化剂过氧化氢用量4 m L、催化剂用量0.01 g、溶剂乙腈用量5 m L、反应温度55℃和冷凝回流60 min条件下,乙醇转化率最高,为85.5%。
The catalytic effect of low-cost and environmentally-friendly layered manganese oxide on ethanol oxidation was studied. The catalysts were characterized by X-ray diffraction, N2 adsorption and scanning electron microscopy. The effects of solvent, reaction temperature, amount of oxidant, amount of catalyst, Reaction time on the catalytic oxidation of ethanol to acetaldehyde. The results show that the prepared Ca_ (0.16) MnO_2 · 2H_2O is porous and lamellar structure. When the amount of oxidant hydrogen peroxide is 4 m L, the amount of catalyst is 0.01 g, the amount of solvent acetonitrile is 5 mL, the reaction temperature is 55 ℃ and the condensation reflux min, the highest ethanol conversion was 85.5%.