Preparation method of acid-base bifunctional graphene-based nano heterogeneous catalyst

Abstract

The invention belongs to the field of catalyst preparation, and in particular relates to an acid-base bifunctional graphene-based nano heterogeneous catalyst and a preparation method thereof. In the catalyst, graphene oxide is used as a carrier and the surface of the graphene oxide is modified with amino groups; the catalyst has a two-dimensional planar structure of a thickness of 1.0-5.0nm. The preparation method of the catalyst comprises: the graphene oxide is dispersed in an organic solvent by using ultrasonic dispersion, and a silane coupling agent is slowly added in and a protective gas is fed into the organic solution; and the mixed reaction system is heated and held, stood, filtered, and dried to obtain the sample. The heterogeneous catalyst has both acid and base active sites on the surface, and the acid and base active sites are independent of each other to achieve individula catalytic effect without neutralizing each other, and have relatively high catalytic activity, thereby improving the reaction efficiency and reducing the production costs. The catalyst has good chemical stability and good thermal stability, and the preparation process is simple, and easy in operation.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to a graphene-based acid-base bifunctional nano-heterogeneous catalyst and a preparation method thereof. Background technique [0002] In organic synthesis, the synthesis of many complex molecules often needs to be completed in multiple steps, which involves cumbersome separation and purification processes. From the perspective of economy and environmental protection, it is very undesirable. It is necessary to reduce steps and avoid Separation and purification of intermediates. Tandem reactions (tandem reactions, domino or cascade reactions), it is not a simple continuous multi-step independent reaction in a reactor, but the active intermediate generated by the first reaction is followed by the second and third steps. At present, tandem reactions have been successfully applied in most organic synthesis processes, especially asymmetric synthesis processes. In these reactions, tan...

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Problems solved by technology

[0003] However, the application of traditional homogeneous catalysts in these series reactions has a series of problems such as the coexistence of catalytic active sites and the recycling and use of catalysts, especially metal catalysts, which are not only expensive and costly, but also cause certain pollution

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