Vanadium-based monoatomic catalyst for directly oxidizing benzene to prepare phenol, and preparation method thereof

Abstract

The invention discloses a vanadium-based monoatomic catalyst for directly oxidizing benzene to prepare phenol, and a preparation method thereof. The catalyst comprises a monoatomic vanadium species derived from a metal-organic framework material NH2-MIL-101 (V), and N-doped amorphous carbon, and the monoatomic vanadium species accounts for 0.1-3% of the weight of the catalyst. The preparation method comprises the following steps: preparing the NH2-MIL-101 (V) from vanadium chloride, 2-aminoterephthalic acid and N,N-dimethylformamide, carrying out high temperature treatment in a N2 atmosphere,and carrying out treatment by using a dilute acid to obtain the vanadium-based monoatomic catalyst V SAs / N-C. The catalyst has an excellent catalytic activity and an excellent reusability when used for directly oxidizing benzene to prepare phenol.

Description

technical field

[0001] The invention relates to a heterogeneous catalyst and a preparation method thereof, in particular to a vanadium-based single-atom catalyst used for the direct oxidation of benzene to phenol and a preparation method thereof. Background technique

[0002] Phenol is an important organic chemical raw material, widely used in dyes, polymers, plastics, medicine, pesticides and other fields. At present, the industrial production method of phenol is mainly the cumene method, but the process flow is complicated, the reaction steps are many, and its development is restricted by the parallel product acetone. In recent years, due to the popularization of the concept of green chemistry, based on the sustainable development strategy, people have gradually shifted their attention to the direct catalytic hydroxylation of benzene to prepare phenol from the aspects of improving atom economy, energy conservation and environmental protection. The direct catalyzed hydroxy...