Chromium metal organic framework catalytic material and preparation method thereof

Abstract

The present invention provides a chromium metal organic framework catalytic material and a preparation method thereof, belongs to the cross technical field of inorganic chemistry, organic chemistry and material chemistry. The chromium metal organic framework catalytic material consists of 2-amino p-phthalic acid and chromium salt coordinated in the form of hexa-coordinate, and a quaternary phosphonium salt ionic liquid is modified to the amino group of the 2-amino p-phthalic acid The preparation method of the chromium metal organic framework catalytic material comprises first preparing a metal organic framework substrate by a solvothermal method, and then modifying the quaternary phosphonium salt ionic liquid to the substrate. The chromium metal organic framework efficiently catalyzes reaction of CO2 with epoxy compound in the presence of no homogeneous catalyst to form cyclic carbonic ester, and reaches a catalytic yield of more than 98%. The preparation method of the chromium metal organic framework catalytic material has the advantages of simple and easy synthetic method, and good reproducibility of synthesized samples.

Description

technical field [0001] The invention relates to the interdisciplinary technical fields of inorganic chemistry, organic chemistry and material chemistry, in particular to a bifunctional chromium metal-organic framework catalytic material with Lewis acidic sites and ionic liquid sites modified by bifunctional ionic liquids and a preparation method thereof. Background technique [0002] The main source of energy in today's modern society is still fossil fuels, and the energy generated by the combustion of fossil fuels accounts for 85% of the total energy demand. The problem that follows is a large amount of carbon dioxide (CO 2 ), resulting in the greenhouse effect. Over the past half century, atmospheric CO 2 Concentration from 609mg / m 3 increased to 746mg / m 3 , have a great impact on the global climate and ecological balance, leading to serious environmental and ecological problems, which will threaten the survival of human beings. However, CO 2 The most important C1 res...

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Problems solved by technology

The first type of MOF catalyst can catalyze the reaction under milder conditions, but it can only be used under the condition of the simultaneous presence of a homogeneous co-catalyst (halogen ion), which causes the product to be separated and purified, complicating the synthesis process ; the second class of MOF catalysts can catalyze CO without the need for a homogeneous co-catalyst 2 Cycloaddition reaction, but requires higher reaction temperature (>100°C) and higher CO 2 pressure (>3MPa), which causes an increase in industrial costs, which is not conducive to energy saving and environmental protection

[0004] The above results indicate that CO can be catalyzed under mild and co-catalyst-free conditions. 2 Preparation of MOF heterogeneous catalysts for cycloaddition reactions remains a challenge

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