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A kind of phosphotungstic acid-metal organic framework for catalyzing cellulose hydrolysis and preparation method and application thereof

A metal-organic framework and phosphotungstic acid technology, which is applied in the direction of chemical instruments and methods, applications, physical/chemical process catalysts, etc., can solve the problems of complex grafting operations of active functional groups, easy loss of acid catalytic ability, and non-selective catalytic performance, etc. problems, to achieve enhanced reusability, avoid glucose side reactions, and reduce the difficulty of hydrolysis

Inactive Publication Date: 2017-11-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing problems in the prior art, such as complex grafting operation of active functional groups, non-selective catalytic performance, easy loss of acid catalytic ability, etc., and to provide a phosphotungstic acid-metal organic compound for catalyzing cellulose hydrolysis. Skeleton and its preparation method and application

Method used

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  • A kind of phosphotungstic acid-metal organic framework for catalyzing cellulose hydrolysis and preparation method and application thereof
  • A kind of phosphotungstic acid-metal organic framework for catalyzing cellulose hydrolysis and preparation method and application thereof
  • A kind of phosphotungstic acid-metal organic framework for catalyzing cellulose hydrolysis and preparation method and application thereof

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Embodiment 1

[0031]A kind of phosphotungstic acid-metal organic framework for catalyzing the hydrolysis of cellulose is made by the following method: 0.48g (2mmol) aluminum chloride hexahydrate, 0.23g (1mmol) 2,5-dichloro-terephthalene Add formic acid, 0.18g (1mmol) 2-aminoterephthalic acid and 0.125g (0.04mmol) phosphotungstic acid to 30mL N,N-diethylformamide, stir well at room temperature, transfer the mixed solution to 100mL poly Stainless steel reaction kettle with tetrafluoroethylene lining, heated from room temperature to 130°C, kept at 130°C for 12 hours, no need to stir during the reaction, cooled to room temperature after reaction, centrifuged, washed repeatedly with N,N-dimethylformamide Until the filtrate is clear and transparent, the white solid obtained by suction filtration is vacuum-dried at 70°C for 16 hours, and the light yellow powder after drying is the phosphotungstic acid-metal organic framework multifunctional material.

Embodiment 2

[0033] A kind of phosphotungstic acid-metal organic framework for catalyzing the hydrolysis of cellulose is made by the following method: 2.25g (8mmol) ferric chloride hexahydrate, 0.97g (4mmol) 2,5-dichloro-terephthalene Add formic acid, 0.75g (4mmol) 2-aminoterephthalic acid and 1g (0.3mmol) phosphotungstic acid to 50mL N,N-dimethylformamide, stir well at room temperature, transfer the mixed solution to 100mL polytetrafluoroethylene A stainless steel reaction kettle with vinyl fluoride lining, heated from room temperature to 110°C, kept at 110°C for 16 hours, no stirring was required during the reaction, cooled to room temperature after the reaction, and the sediment obtained by centrifugation was washed with N,N-dimethylformamide After repeated washing and suction filtration, until the filtrate is clear and transparent, the dark brown solid obtained by suction filtration is vacuum-dried at 80°C for 16 hours, and the brown powder after drying is the phosphotungstic acid-metal...

Embodiment 3

[0035] A kind of phosphotungstic acid-metal organic framework for catalyzing the hydrolysis of cellulose is prepared by the following method: 0.8g (2mmol) chromium chloride hexahydrate, 0.23g (1mmol) 2,5-dichloroterephthalene Add formic acid, 0.18g (1mmol) 2-aminoterephthalic acid and 0.125g (0.04mmol) phosphotungstic acid to 15mL 0.2mol / L sodium hydroxide aqueous solution, stir well at room temperature, transfer the mixed solution to 100mL polytetrafluoroethylene A stainless steel reaction kettle with vinyl fluoride lining, heated from room temperature to 150°C, and kept at 150°C for 10 hours. The reaction process does not need to be stirred. After the reaction, it is cooled to room temperature, and the sediment obtained by centrifugation is washed with N,N-dimethylformamide After repeated washing and suction filtration, until the filtrate is clear and transparent, the dark green solid obtained by suction filtration is vacuum-dried at 70°C for 16 hours, and the yellow-green po...

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Abstract

The invention discloses a phosphotungstic acid-metal organic skeleton used for catalyzing hydrolysis of cellulose, and a preparation method and application thereof. According to the invention, organic ligand with strongly electronegative groups and basic groups is screened out and participates in coordination reaction of a metal organic skeletal material so as to realize functionalization, phospho-tungstic acid is directly added into a synthesis system, and immobilization is realized in the process of synthesis. The prepared phosphotungstic acid-metal organic skeleton reduces the frequency of contact with glucose through formation of a hydrogen bond with cellulose so as to reduce side reaction of glucose under the catalysis of acid, high glucose selectivity is obtained, and oriented conversion of cellulose to glucose can be realized; meanwhile, the effect of the hydrogen bond can weaken the effect of a hydrogen bond in cellulose, reduces the crystallization degree of cellulose, enables cellulose to be easier to hydrolyze and improves hydrolysis efficiency.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a phosphotungstic acid-metal organic framework for catalyzing the hydrolysis of cellulose and its preparation method and application. Background technique [0002] Biomass energy is regarded as an alternative energy source for petroleum with broad development prospects. The key to its transformation into important energy substances and basic platform compounds lies in the directional hydrolysis of cellulose, an important component of biomass, into glucose. Cellulose hydrolysis is first converted into glucose, and glucose is further subjected to isomerization, dehydration, rehydration, hydrogenation, hydrogenolysis and other reactions to produce fructose, 5-hydroxymethylfurfural, levulinic acid, and sorbitol, mannitol, Important energy substances and basic platform compounds such as polyols including ethylene glycol. Although some researchers have tried to directly convert cellulose to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C13K1/02
CPCB01J31/1805B01J31/2213B01J2531/0238B01J2531/31C13K1/02
Inventor 王艳张颖诗万金泉马邕文
Owner SOUTH CHINA UNIV OF TECH
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