镁掺杂四氧化三钴催化环己烷氧化初步研究

doi:10.19964/j.issn.1006-4990.2022-0513

Abstract

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

CLC Number:

TQ132.2

YUAN Enxian, LI Jinpeng, LI Qian, ZHOU Meixia, JIAN Panming. Preliminary study on cyclohexane catalytic oxidation over magnesium-doped tricobalt tetraoxide[J]. Inorganic Chemicals Industry, 2023, 55(6): 136-141.

Figures/Tables 6

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催化剂	比表面积/ （m²∙g^-1）	最可几孔径/nm	平均孔径/nm	孔容/ （cm³∙g^-1）
MgO/Co₃O₄-0.1	35.9	3.5	36	0.32
MgO/Co₃O₄-0.2	33.8	3.3	36	0.30
MgO/Co₃O₄-0.6	30.1	3.8	37	0.28
MgO/Co₃O₄-1.5	24.1	4.6	40	0.24

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

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