【摘要】 以MgO为载体,水合肼为还原剂,采用浸渍还原法制备了Cu2O/MgO催化剂,考察了不同制备条件对其催化环己醇脱氢性能的影响,并采用N2物理吸附、X射线衍射、透射电镜、X射线光电子能谱、俄歇电子能谱和程序升温还原等手段对催化剂进行了表征.实验结果表明,当Cu2+∶N2H4·H2O∶NaOH摩尔比为1∶1∶2时催化剂的活性最高.与传统的Cu/MgO催化剂相比,Cu2O/MgO催化剂对环己醇脱氢反应具有很高的催化活性.更多还原

【Abstract】 In order to obtain a more effective catalyst for the dehydrogenation of cyclohexanol to cyclohexanone, the MgO-supported Cu₂O catalyst was prepared by chemical reduction combined with impregnation using MgO as the support and hydrazine hydrate as the reducing agent. The effects of preparation conditions on the catalytic properties of the catalyst were studied, and the catalyst was characterized by N₂ adsorption, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Auger electron spectroscopy, and temperature-programmed reduction. Cu₂O is reduced to Cu⁰ when the amount of N₂H₄·H₂O used is high. With increasing amount of NaOH used, the catalyst particles congregate and the specific surface area of catalyst decreases. The catalyst activity for dehydrogenation of cyclohexanol reaches the maximum at a Cu 2+ ∶N₂H₄·H₂O∶NaOH molar ratio of 1∶1∶2. The catalyst reduced by N₂H₄·H₂O is composed of Cu⁺ only, whereas the traditional Cu/MgO catalyst contains Cu⁰ and little Cu⁺. Because Cu⁺ is more active than Cu⁰, the activity of the Cu₂O/MgO catalyst is much higher than that of the traditional Cu/MgO catalyst.更多还原