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CaFe2O4 type magnetic solid catalyst and application thereof

A solid catalyst and magnetic technology, applied in the direction of physical/chemical process catalysts, applications, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult recycling of solid catalysts, complex components of magnetic solid catalysts, solid catalysts and Difficult separation of cellulose residues and other problems, to achieve the effect of reducing hydrolysis cost, simple preparation method, and improving hydrolysis efficiency

Inactive Publication Date: 2012-06-27
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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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 single chemical composition CaFe 2 o 4 Type magnetic solid catalyst, the magnetic solid catalyst can be fully recovered and reused, which helps to reduce the production cost of the cellulose hydrolysis process

Method used

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  • CaFe2O4 type magnetic solid catalyst and application thereof
  • CaFe2O4 type magnetic solid catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Press n[Ca(NO 3 ) 2 ]: n[Fe(NO 3 ) 3 ]=2:1, n[urea]:n[metal ion]=5:1, n[H 2 O]:n[urea]=20:1 to form a mixed solution, and the mixed solution was uniformly stirred and reacted at 135°C for 12h, and then the reaction solution was left to stand at 95°C for 12h, then the precipitate was washed to neutral, and then centrifuged Obtain the precipitate, dry the precipitate and grind it into 1~100μm powder, then calcined at 1000°C for 3h, the obtained product is CaFe 2 o 4 type magnetic solid catalyst.

[0036] Prepare a homogeneous mixture according to the mass ratio of magnetic solid catalyst to cellulose of 1.5:1, prepare 150mL of homogenate according to the mass ratio of pure water to mixture of 15:1, heat the homogenate to 150°C within 50min, and catalyze it at a stirring rate of 300rpm After 24 hours of reaction, the cellulose hydrolysis mixture was obtained, and separated under 20000g centrifugal force for 10 minutes to obtain the cellulose hydrolysis solution and t...

Embodiment 2

[0042] Electromagnetic equipment is used to separate the magnetic solid catalyst in Example 1, and the recovery rate of the catalyst is 99%, and it is used for the second time after being dried at 300° C. for 1 h. The mass ratio of magnetic solid catalyst to cellulose is 1.5:1 Prepare a homogeneous mixture, make 150mL homogenate according to the mass ratio of pure water and mixture at 15:1, heat the homogenate to 150°C within 50min, and catalyze the reaction at a stirring rate of 300rpm for 24h to obtain a cellulose hydrolysis mixture, at 20000g Separation under centrifugal force for 10 minutes to obtain cellulose hydrolyzate and solid mixture, after drying the solid mixture, using electromagnet equipment to separate the magnetic solid catalyst in the solid mixture for reuse.

[0043] Measure the carbon-containing quality of the cellulose hydrolyzate with a total organic carbon analyzer, calculate the cellulose hydrolysis rate by formula 1 is 42%, measure the glucose content in...

Embodiment 3

[0046] Electromagnetic equipment is used to separate the magnetic solid catalyst in Example 2, and the catalyst recovery rate is 96%. It is used for the third time after being dried at 300° C. for 1 h. The mass ratio of magnetic solid catalyst to cellulose is 1.5:1 Prepare a homogeneous mixture, make 150mL homogenate according to the mass ratio of pure water and mixture at 15:1, heat the homogenate to 150°C within 50min, and catalyze the reaction at a stirring rate of 300rpm for 24h to obtain a cellulose hydrolysis mixture, at 20000g Separation under centrifugal force for 10 minutes to obtain cellulose hydrolyzate and solid mixture, after drying the solid mixture, using electromagnet equipment to separate the magnetic solid catalyst in the solid mixture for reuse.

[0047] Measure the carbon-containing quality of the cellulose hydrolyzate with a total organic carbon analyzer, calculate the cellulose hydrolysis rate by formula 1 is 40%, measure the glucose content in the cellulo...

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Abstract

The invention discloses a CaFe2O4 type magnetic solid catalyst and an application thereof. According to the invention, a composite metal hydroxide is synthesized with a co-precipitation method by using metal salt and a precipitating agent; the metal hydroxide is dried, and is calcined under a high temperature, such that the required magnetic solid catalyst is obtained. The catalyst has a relatively high catalytic activity, and can be used for catalyzing cellulose hydrolysis with a high efficiency for preparing glucose. The obtained cellulose hydrolysate is neutral, and has high glucose content. After use, the catalyst can be recycled with a high efficiency by using electromagnet equipment, and can be used again. With the catalyst, cellulose hydrolysis cost can be substantially reduced, and cellulose hydrolysis efficiency can be improved. The catalyst provided by the invention is advantaged in abundant raw material, simple preparation method, low production cost, and good reproducibility.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, in particular to a CaFe 2 o 4 type magnetic solid catalyst. At the same time, the invention also relates to the application of the magnetic solid catalyst in the hydrolysis of cellulose to prepare glucose. Background technique [0002] Due to the gradual depletion of fossil energy, increasing energy demand and increasingly important environmental protection, people are increasingly aware of the urgency of seeking clean and renewable energy. Cellulose is a renewable resource that can be hydrolyzed to generate glucose, and its annual fixed energy is second only to coal, oil and natural gas. Since the glucose obtained from cellulose hydrolysis can be used as food, chemical products and biofuels, the research on the sugar production process by cellulose hydrolysis has been highly valued by researchers at home and abroad. Cellulose hydrolysis methods include: cellulase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C13K1/02
Inventor 张帆方真
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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