催化学报 ›› 2007, Vol. 28 ›› Issue (1): 57-61.

• 研究论文 • 上一篇    下一篇

MgO负载Cu2O催化剂的制备及其催化环己醇脱氢

石秋杰,刘宁,梁义   

  1. 南昌大学应用化学研究所, 江西南昌 330031
  • 收稿日期:2007-01-25 出版日期:2007-01-25 发布日期:2010-08-28

Preparation of MgO-Supported Cu2O Catalyst and Its Catalytic Properties for Cyclohexanol Dehydrogenation

SHI Qiujie*, LIU Ning, LIANG Yi   

  1. Institute of Applied Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China
  • Received:2007-01-25 Online:2007-01-25 Published:2010-08-28

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.

关键词: 水合肼, 浸渍还原法, 氧化亚铜, 氧化镁, 负载型催化剂, 环己醇, 脱氢, 环己酮

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 Cu2+∶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.

Key words: hydrazine hydrate, impregnation reduction, cuprous oxide, magnesia, supported catalyst, cyclohexanol, dehydrogenation, cyclohexanone