无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (6): 136-141.doi: 10.19964/j.issn.1006-4990.2022-0513

• 催化材料 • 上一篇    下一篇

镁掺杂四氧化三钴催化环己烷氧化初步研究

袁恩先1(), 李金鹏1, 李倩2, 周美霞1, 菅盘铭1   

  1. 1.扬州大学化学化工学院,江苏 扬州 225002
    2.济川药业集团有限公司,江苏 泰州 225441
  • 收稿日期:2022-08-28 出版日期:2023-06-10 发布日期:2023-06-14
  • 作者简介:袁恩先(1989— ),男,博士,主要研究方向为多相催化、石油化工;E-mail:exyuan@yzu.edu.cn
  • 基金资助:
    国家自然科学基金(22108236);江苏省自然科学基金项目(BK20180935)

Preliminary study on cyclohexane catalytic oxidation over magnesium-doped tricobalt tetraoxide

YUAN Enxian1(), LI Jinpeng1, LI Qian2, ZHOU Meixia1, JIAN Panming1   

  1. 1. School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China
    2. Jumpcan Pharmaceutical Group Co.,Ltd.,Taizhou 225441,China
  • Received:2022-08-28 Published:2023-06-10 Online:2023-06-14

摘要:

以金属有机骨架材料(ZIF-67)为前驱体负载氧化镁(MgO),制备氧化镁/四氧化三钴(MgO/Co3O4)并用于环己烷催化氧化。采用X射线衍射(XRD)、红外光谱(FT-IR)、CO2程序升温脱附(CO2-TPD)、透射电镜(TEM)等表征技术对MgO/Co3O4催化剂进行系统研究。结果表明:低MgO负载量时,MgO与Co3O4颗粒均匀分布,两相之间的作用导致部分Mg离子掺杂进Co3O4骨架中;在高MgO负载量时,MgO发生严重的团聚,致使其与Co3O4的作用减弱。MgO/Co3O4-x的催化活性随MgO负载量的增加呈现先增强后减弱的趋势,MgO/Co3O4-0.6显示出最佳催化性能,环己烷转化率达到16.5%时,环己醇和环己酮选择性之和为70.0%。引入的MgO有利于产物有机酸和水的吸附,从而显著减缓Co3O4表面活性位点的中毒失活。

关键词: 环己烷, 催化氧化, 四氧化三钴, 氧化镁改性

Abstract:

MgO/Co3O4 catalysts were synthesized from metal organic skeleton material(ZIF-67) as precursor loaded with MgO and applied to the aerobic oxidation of cyclohexane.The MgO/Co3O4 catalyst was systematically studied using characterization techniques such as X-ray diffraction(XRD),infrared spectroscopy(FT-IR),CO2 temperature programmed desorption(CO2-TPD),and transmission electron microscopy(TEM).The results showed that at low MgO loading,MgO and Co3O4 particles were uniformly distributed,and the interaction between the two phases led to some Mg2+ doping into the Co3O4 skeleton.At high MgO loading,MgO was aggregated seriously,resulting in a weakened interaction with Co3O4.The catalytic activity of MgO/Co3O4-x presented a volcano shape with increasing MgO loading.MgO/Co3O4-0.6 exhibited the best catalytic performance,with a cyclohexane conversion rate of 16.5% and a selectivity of 70.0% for cyclohexanol and cyclohexanone.The deactivation of catalysts was effectively retarded due to the incorporation of MgO adsorbing the organic acids and water.

Key words: cyclohexane, catalytic oxidation, Co3O4, MgO modification

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