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Lewis acid-base bifunctional catalyst and preparation method and application thereof

A dual-functional catalyst and catalyst technology, which is applied in the direction of catalyst activation/preparation, catalytic reaction, and carboxylic acid nitrile preparation, can solve the problems of uncontrollable MOFs assembly process, single catalyst function, and large unpredictability, and achieve excellent catalysis High performance, high recycling rate, and the effect of less catalyst consumption

Active Publication Date: 2021-03-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a set of Lewis MOFs in order to solve at least one technical problem in the uncontrollable assembly process of most MOFs in the prior art, the variable structure, the large unpredictability, and the single function of the obtained catalyst. Lewis acid-base bifunctional catalyst with integrated acid-base bifunctional active sites and its preparation method and application

Method used

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  • Lewis acid-base bifunctional catalyst and preparation method and application thereof
  • Lewis acid-base bifunctional catalyst and preparation method and application thereof
  • Lewis acid-base bifunctional catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the synthesis of Lewis acid-base bifunctional catalyst

[0032] (1) Weigh according to the molar ratio of 2,4,6-tris(4-pyridyl)-1,3,5-triazine to trimesic acid at 1:1, and mix to form a mixed compound;

[0033] (2) Weigh nickel sulfate hydrate metal salt according to the molar ratio of nickel sulfate hydrate and 2,4,6-tris(4-pyridyl)-1,3,5-triazine in step (1) in a ratio of 1:1 ;

[0034] (3) Nickel sulfate hydrate and the mixture were stirred in DMF / EtOH / H 2 O (volume ratio is 4:1:2) mixed in a mixed solvent, configured as a precursor solution;

[0035] (4) Transfer the precursor solution obtained in (3) into a hydrothermal kettle with a volume ratio of 1 / 3, perform solvothermal reaction at 100° C. for 72 hours, suction filter, wash, and dry to obtain a catalyst.

[0036] The catalyst obtained is composed of 2,4,6-tris(4-pyridyl)-1,3,5-triazine and trimesic acid to form a mixed body, with Ni(II) as the central metal ion, the mixed Ligands and Ni(II) ass...

Embodiment 2

[0039] Embodiment 2: the synthesis of Lewis acid-base bifunctional catalyst

[0040] This example is basically the same as Example 1, except that the solvothermal reaction in the step (4) of this example is carried out at a temperature of 80° C. for 48 hours.

Embodiment 3

[0041] Embodiment 3: the synthesis of Lewis acid-base bifunctional catalyst

[0042] This example is basically the same as Example 1, except that in step (2) of this example, nickel sulfate hydrate and 2,4,6-tris(4-pyridyl)-1,3 in (1) , The molar ratio of 5-triazine is 2:1, and the hydrated nickel sulfate metal salt is weighed, and the solvothermal reaction in step (4) of this embodiment is carried out at a temperature of 120° C. for 60 hours.

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Abstract

The invention relates to a Lewis acid-base bifunctional catalyst and a preparation method and application thereof, the catalyst is a catalyst with a three-dimensional porous structure assembled by a mixed ligand consisting of 2, 4, 6-tri (4pyridyl)-1, 3, 5-triazine and trimesic acid and Ni (II) serving as a central ion. Compared with the prior art, the catalyst material provided by the invention has a large specific surface area and Lewis acid-base bifunctional active sites, can be used for a one-pot series aromatic alcohol catalytic oxidation Knoevenagel condensation reaction under mild conditions, and has the highest catalytic efficiency of 87% and the selectivity of 99%.

Description

technical field [0001] The invention relates to a coordination polymer, in particular to a Lewis acid-base bifunctional catalyst, a preparation method and application thereof. Background technique [0002] Considering the requirements of "green chemistry" and sustainable chemistry, the cascade reaction of organic chemistry has attracted more and more attention and interest of chemists. As we all know, the advantages of multi-step tandem reactions in organic synthesis are mainly manifested in: (1) The intermediates of tandem reactions do not need to be separated, and can be directly used in in situ reactions, thus simplifying the operation steps. For sensitive, unstable intermediates, this advantage is particularly prominent; (2) the tandem reaction reduces the consumption of solvents and eluents and the generation of by-products, which is conducive to environmental protection and meets the current advocacy of "green chemistry"; (3) Cascade reactions can often obtain unique ...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J37/10C07C45/38C07C47/54C07C253/30C07C255/34
CPCB01J31/1691B01J37/10C07C45/38C07C253/30B01J2531/847B01J2531/0241B01J2231/763B01J2231/4205C07C47/54C07C255/34
Inventor 邢媛媛张建勇邓维刘青张林燕包玉梅
Owner SHANGHAI INST OF TECH
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