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High-efficiency heteropolymetallic catalysts for the synthesis of cyclocarbonates from carbon dioxide

A technology that efficiently catalyzes carbon dioxide and cyclocarbonate, applied in the chemical field, can solve problems such as poor stability, harsh conditions, and low catalytic efficiency

Active Publication Date: 2021-04-23
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for efficiently catalyzing carbon dioxide to synthesize cyclocarbonate with heteropolymetallic coordination polymer materials, aiming at the insufficient technology of converting carbon dioxide and epoxy compounds into cyclocarbonate at present. The catalyst can solve the problem of other catalysts. Low catalytic efficiency, poor stability, harsh conditions, etc.

Method used

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  • High-efficiency heteropolymetallic catalysts for the synthesis of cyclocarbonates from carbon dioxide
  • High-efficiency heteropolymetallic catalysts for the synthesis of cyclocarbonates from carbon dioxide
  • High-efficiency heteropolymetallic catalysts for the synthesis of cyclocarbonates from carbon dioxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 2.22g 5-allyl-3-methoxy methyl salicylate and 3.50g hydrazine hydrate in the 25ml two-necked bottle equipped with reflux condenser, thermometer and magnetic son, then add 10ml methanol as solvent, control The temperature was kept at 60-65°C for 12 hours. After the reaction was completed, the temperature was lowered to room temperature, and a white solid was precipitated. After the solid was filtered, washed, and dried, a white 5-allyl-3-methoxysalicylic hydrazide solid was obtained.

Embodiment 2

[0037] Add 2.22g of 5-allyl-3-methoxy salicylhydrazide and 2.34g of 3,5-di-tert-butyl salicylaldehyde to a 25ml two-necked bottle equipped with a reflux condenser, a thermometer and a magnet, and then add 10ml Methanol was used as a solvent, and the temperature was controlled at 60-65°C for 6 hours. After the reaction was completed, the temperature was lowered to room temperature, and a white solid was precipitated. After the solid was filtered, washed, and dried, a white organic ligand solid was obtained.

Embodiment 3

[0039] With catalyst 0.01mol%, cocatalyst TBAB 0.75mol%, substrate is epoxystyrene 10mmol, join in the autoclave of 30ml, fill into 1MPa CO 2 , put the reaction kettle in a constant temperature heating mantle and raise the temperature to 120°C, react for 1h, and finally cool the reaction kettle to room temperature, release residual gas, and take samples for use 1 H NMR carried out quantitative analysis, the conversion rate was 95%, and the selectivity was greater than 99%.

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Abstract

The invention provides a method for efficiently catalyzing carbon dioxide to synthesize cyclocarbonate with a heteropolymetallic coordination polymer material, and relates to a chemical synthesis catalyst and a preparation method thereof. The catalyst is a heterometallic coordination polymer material with good thermal stability. Its structure is a 1D double-chain planar structure. All catalytic active sites are exposed outside, which has high catalytic conversion efficiency and selectivity. sex. The catalyst has many advantages such as stable structure, not easy to decompose, no need of organic solvent in the reaction process, wide application range, high product yield and low synthesis cost. The invention can solve many problems such as high synthesis temperature and pressure, large amount of catalyst, long reaction time, low product yield and poor selectivity in the conversion of carbon dioxide and epoxy compound into cyclocarbonate reaction in the past, and can be used for carbon dioxide greenhouse gas resource utilization.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a heteropolymetal high-efficiency catalyst for efficiently catalyzing carbon dioxide to synthesize cyclocarbonate and a preparation method thereof. [0002] technical background [0003] In recent years, with the emphasis on carbon pollution and the development of carbon chemistry, CO 2 As the final state of carbon resources, it is also a major greenhouse gas and an important C1 resource. Due to its abundant reserves, non-toxicity and inertness, more and more chemical workers pay more and more attention to it. Rational use of CO 2 It can not only reduce environmental problems, but also has great significance in alleviating energy crisis. But the chemical inertness of carbon dioxide hinders its use in chemical reactions. In recent years, more and more people have begun to pay attention to and explore catalysts that can activate carbon dioxide, and use it as a raw material to react with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C07D317/36
CPCB01J31/2217B01J2231/4288C07D317/36
Inventor 刘伟生王刚徐聪汪力
Owner LANZHOU UNIVERSITY