Pyridinium modified UiO-66 type compound, preparation method and application

Abstract

The invention discloses a pyridinium-modified UiO-66 type compound which is constructed by a linear dicarboxylic acid ligand containing a pyridinium substituent and a metal oxygen cluster Zr6O4 (OH) 4, a main body framework is positively charged, halide ions are dispersed in the framework as counter anions, and the pyridinium-modified UiO-66 type compound has high stability, relatively high specific surface area and remarkable porous characteristics; cO2 and epoxide can be effectively catalyzed to synthesize cyclic carbonate under mild conditions without a cocatalyst and a solvent, the cyclic carbonate can be recycled, and a product is easy to separate and purify.

Description

A pyridinium-modified UiO-66 type compound, preparation method and application technical field The present invention relates to a kind of new compound, preparation method and application, especially a kind of pyridinium modified UiO-66 Types of compounds, preparation methods and applications. Background technique Excessive CO in the Environment 2 Gases cause global warming, which in turn triggers a series of melting glaciers and rising sea levels A series of problems seriously threaten the survival of human beings. An effective solution is to reduce CO 2 emissions while removing CO from the environment 2 catch capture, store and convert into useful substances such as CO 2 and epoxy compound under the action of catalyst to synthesize excellent solvent Cyclic carbonate, used in industrial production. The traditional synthesis method is a homogeneous catalytic process, and there are products that are not easy to separate and catalyze. The problem tha...

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Problems solved by technology

The traditional synthesis method is a homogeneous catalytic process, which has the problems of difficult separation of products and difficult regeneration of catalysts. Therefore, people have developed efficient heterogeneous catalysts such as MOFs

MOFs are metal-organic framework materials with large specific surface area, adjustable composition and structure, etc. They show excellent performance in catalyzing the reaction of CO2 and epoxy compounds to synthesize cyclic carbonates. However, the practical application is limited due to the instability of most MOFs

UiO-66 constructed from terephthalic acid and metal oxygen clusters Zr6O4(OH)4 is one of the few One of several water-stable MOFs with good hydrothermal stability in the pH range 1-11, however, it serves as a catalyst for the reaction of CO2 with epoxides to synthesize cyclic carbonates When used, it must be under the synergistic effect of tetrabutylammonium bromide and other co-catalysts to show catalytic activity, and the introduction of co-catalysts not only increases the cost, but also makes the product difficult to separate

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