This work presents the preparation and characterization of copper supported on gamma alumina (γ–Al₂O₃) as a catalyst and compared with the photocatalytic activity of titania (TiO₂) in the oxidation of methanol and ethanol mixtures; the ratio of both alcohols in the mixture was according to the commercial alcoholic beverages. In order to understand the thermal transformations of Cu/Al₂O₃ catalyst, a kinetic model of its synthesis has been developed and analyzed in terms of the oxidation of the precursor CuCl₂∙2H₂O impregnated onto Al₂O₃ to form CuO/Al₂O₃, and also its reduction to form the metallic copper supported on alumina (Cu/Al₂O₃) catalyst. The sequence of reactions was considered according to the X–ray diffraction (XRD) at different temperatures and thermal characterizations. The kinetic parameters revealed how the alumina support intervened in some steps to form the catalyst through chemical metal–support interactions. It was also verified that during the chemical changes that the active phase undergoes, its good dispersion is maintained on the support and the activation energy values of the model can predict that these metal–support chemical interactions were also preserved from the salt added to the formation of elementary copper. These kinetic model’s predictions were accurately demonstrated by High–resolution transmission electron microscopy (HRTEM) micrographs and X–ray photoelectron spectra (XPS) techniques, where the appearance of the copper aluminate phase (CuAl₂O₄) is an evidence of the metal–support interaction, which could have contributed to the elementary copper nanoparticles formation and the catalytic activity as an active phase in the oxidation of alcohols. Cu/Al₂O₃ catalyst showed a higher yield of acetic acid from ethanol than formic acid from methanol. In comparison, the TiO₂ in the photocatalytic oxidation presented a higher yield of formic acid from methanol than acetic acid from ethanol. A similar behavior was observed in the oxidation tests of each alcohol separately, since, the photocatalytic oxidation of methanol, using TiO₂, showed nearly the 100% of selectivity in the formation of formic acid from methanol, and the Cu/Al₂O₃ catalyst exhibited similar results but, in this case, the selectivity towards to acetic acid from ethanol. Stable acetate intermediates detected by FTIR in ethanol oxidation to acetic acid on Cu/Al₂O₃ showed that this oxidation proceeds via acetaldehyde intermediates.

这项工作提出了制备和铜的表征负载在γ氧化铝（γ-Al系₂ ö ₃）作为催化剂，并用二氧化钛（二氧化钛的光催化活性相比₂）在甲醇和乙醇的混合物的氧化; 混合物中两种醇的比例根据市售含酒精饮料而定。为了理解Cu / Al ₂ O ₃催化剂的热转变，建立了合成动力学模型，并根据浸渍在Al ₂ O ₃上的前体CuCl ₂ ∙2H ₂ O氧化形成CuO的动力学模型进行了分析。/铝₂ O ₃，并还原成负载在氧化铝上的金属铜（Cu / Al ₂ O ₃）催化剂。根据在不同温度和热特性下的X射线衍射（XRD）考虑了反应的顺序。动力学参数揭示了氧化铝载体是如何在某些步骤中通过化学金属与载体之间的相互作用进行干预以形成催化剂的。还证实了在活性相经历的化学变化过程中，其在载体上保持了良好的分散性，并且模型的活化能值可以预测这些金属-载体的化学相互作用也可以通过添加到地层中的盐得以保留。基本铜。这些动力学模型的预测已通过高分辨率透射电子显微镜（HRTEM）显微照片和X射线光电子能谱（XPS）技术得到了准确证明，其中铝酸铜相（CuAl₂ O ₄）是金属与载体相互作用的证据，它可能有助于形成基本的铜纳米颗粒，并在醇氧化中作为活性相发挥催化活性。Cu / Al ₂ O ₃催化剂显示出乙醇中乙酸的收率高于甲醇中甲酸的收率。相比之下，光催化氧化中的TiO ₂的甲醇收率要高于乙醇的乙酸收率。分别在每种醇的氧化试验中观察到了相似的行为，因为使用TiO ₂对甲醇进行光催化氧化表明，在由甲醇形成甲酸和Cu / Al时，选择性接近100％。₂ O ₃催化剂显示出相似的结果，但是在这种情况下，乙醇对乙酸的选择性高。通过FTIR在Cu / Al ₂ O ₃上乙醇氧化为乙酸中检测到的稳定的乙酸酯中间体表明，该氧化过程是通过乙醛中间体进行的。