Preparation method of Co particle coated CNT (carbon nanotube) catalytic material and application of catalytic material in cyclohexane oxidation reaction

Abstract

The invention discloses a preparation method of a Co particle coated CNT (carbon nanotube) catalytic material and an application of the catalytic material in a cyclohexane oxidation reaction. CNTs are coated with Co particles, obtained Co@OCNTs are used for preparation of KA oil through cyclohexane oxidation, and better cyclohexane conversion rate and KA selectivity are shown; size of the Co particles is controlled by sufficiently utilizing the confinement effect of CNTs, meanwhile, electronic structures of the CNTs are changed by Co, and relatively considerable cyclohexane conversion rate and KA oil selectivity are obtained through the interaction of the CNTs and the Co particles. The use of noble metal and organic solvents is avoided, so that the preparation method is more economical and more environment-friendly; due to limitation of the CNTs to Co, Co is not prone to losing and can be recycled, and thought for modified application of the CNTs is broadened.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a method for preparing a carbon nanotube-coated cobalt particle catalytic material and its application in cyclohexane oxidation reaction. Background technique [0002] At present, the industrial production of cyclohexanol and cyclohexanone (KA oil) by oxidation of cyclohexane mainly includes cobalt salt method and boric acid method in non-catalytic oxidation method and catalytic oxidation method. Among them, no catalytic oxidation reaction product is easy to separate and purify, and the selectivity of KA oil is high, but the reaction temperature is high, the energy consumption is large, and the conversion rate of cyclohexane is low; 2 (1-2MPa), carried out at 160°C, the conversion rate of cyclohexane is about 4%, the selectivity of KA oil is about 80%, and the energy consumption is high and the efficiency is low; the boric acid catalytic oxidation method has high alcohol and k...

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Problems solved by technology

[0004] Yu Hao et al. (CN102040504A) invented a carbon nanotube filled with magnetic iron particles as a catalyst to catalyze the oxidation of cyclohexane. This invention uses the magnetism of the catalyst to simplify the separation of the catalyst, and the filling of Fe improves the catalytic performance of the carbon nanotube. Activity, but the use of organic solvents in the reaction increases the energy consumption of the separation, and a large amount of adipic acid is obtained

[0005] Xu Lixin et al. (CN105646153A) invented a method for catalytic oxidation of cyclohexane with a supported Au / C3N4@SBA-15 nanocatalyst, and Chen Lijuan et al. (CN105327717) invented a SiO 2 -Mesoporous TiO 2 Nano-gold cyclohexane oxidation catalyst encapsulated by hollow microspheres. This catalyst has high catalytic activity, but it uses Au precious metal, and the cost is high.

[0006] However, homogeneous catalysts are used in industrial applications, not only the conversion rate is low, but the catalysts are also difficult to recycle.

[0007] However, if a noble metal catalyst is used, although it can increase the conversion rate, it will consume a high cost, which is uneconomical and not suitable for industrial production; in addition, if the reaction process uses an organic solvent as a reaction solvent, it will cause a heavy separation load and also will significantly increase production costs

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