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Preparation method of magnetic biomimetic carbon-based solid acid catalyst

A solid acid catalyst, an enzyme-like carbon-based technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve problems such as poor stability and catalytic activity , to achieve the effect of low production cost, enhanced hydrolysis capacity, and improved adsorption capacity

Inactive Publication Date: 2015-12-16
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these magnetic solid acid catalysts basically use magnetic ferric oxide particles as the core, and after modifying the surface and then loading acidic functional groups, their stability and catalytic activity are not as good as those of carbon-based solid acid catalysts.

Method used

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  • Preparation method of magnetic biomimetic carbon-based solid acid catalyst
  • Preparation method of magnetic biomimetic carbon-based solid acid catalyst
  • Preparation method of magnetic biomimetic carbon-based solid acid catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Weigh 20 g of enzymatic hydrolysis residue lignin from corncobs, wash them with deionized water and absolute ethanol for 10 times, and vacuum-dry at 80°C for 12 hours; grind the enzymatic hydrolysis residue lignin after washing and drying to 120 mesh size, And it was added to the ferric chloride solution with a concentration of 20mmol / L at a mass volume ratio of 1:50 and stirred for 5h, then heated to evaporate excess water in the solution, and the remaining solid mixture was vacuum-dried at 80°C for 12h; The enzymolysis residue lignin after ferric chloride impregnation and drying was mixed with chloromethyl polystyrene resin at a mass ratio of 5:2, and then carbonized at 500°C for 1 hour under a nitrogen atmosphere to obtain a magnetic enzyme-like carbon carrier; after carbonization, The magnetic enzyme-mimetic carbon carrier was added to concentrated sulfuric acid at a mass volume ratio of 1:10 for sulfonation, stirred and heated at 150°C for 10h under a nit...

Embodiment 2

[0026] Example 2: Weigh 20 g of enzymatic hydrolysis residue lignin from corn stalks, wash with deionized water and absolute ethanol 10 times respectively, and vacuum-dry at 80°C for 12 hours; grind the enzymatic hydrolysis residue lignin after washing and drying to 120 mesh size, And it was added to the ferric chloride solution with a concentration of 10mmol / L at a mass volume ratio of 1:100 and stirred for 10h, then heated to evaporate excess water in the solution, and the remaining solid mixture was vacuum-dried at 80°C for 12h; The enzymolysis residue lignin impregnated with ferric iron and dried was mixed with sucralose at a mass ratio of 10:1, and then carbonized at 500°C for 1 hour under a nitrogen atmosphere to obtain a magnetic enzymatic carbon carrier; the carbonized magnetic enzymatic carbon The carrier was added to concentrated sulfuric acid at a mass volume ratio of 1:30 for sulfonation, stirred and heated at 80°C for 24 hours under a nitrogen atmosphere; the sulfo...

Embodiment 3

[0028] Example 3: Weigh 20g of bagasse enzymolysis residue lignin, wash with deionized water and absolute ethanol 10 times respectively, and vacuum-dry at 80°C for 12 hours; grind the enzymolysis residue lignin after washing and drying to 120 mesh size, And it was added to the ferric chloride solution with a concentration of 25mmol / L at a mass volume ratio of 1:75 and stirred for 7h, then heated to evaporate excess water in the solution, and the remaining solid mixture was vacuum-dried at 80°C for 12h; Ferric chloride impregnated and dried enzymolysis residue lignin was mixed with polyvinyl chloride at a mass ratio of 5:1, and then carbonized at 500°C for 1 h under nitrogen atmosphere to obtain a magnetic imitation enzyme carbon carrier; the carbonized magnetic imitation enzyme The carbon carrier was added to concentrated sulfuric acid at a mass volume ratio of 1:20 for sulfonation, and stirred and heated at 200°C for 5 hours under a nitrogen atmosphere; the sulfonated magnetic...

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Abstract

The invention discloses a preparation method of a magnetic biomimetic carbon-based solid acid catalyst. Enzymatically decomposed residual lignin serves as a starting raw material, a chlorine-containing compound serves as a dopant, and the magnetic biomimetic carbon-based solid acid catalyst is obtained after pretreatment, dipping, evaporation, carbonization and sulfonation are performed in sequence. The obtained catalyst further contains a chlorine group (-Cl) besides a carboxyl group (-COOH), phenolic hydroxyl (Ph-OH) and a sulfonic group (-SO3H) and can improve cellulose adsorption ability and enhance the cellulose hydrolysis capacity, the raw materials are low in price, the manufacturing cost is low, the high efficiency of inorganic acid hydrolysis, adsorption directionality of cellulose enzyme and recycling of magnetic solid acid are effectively coupled, and the preparation method has important practical significance on development of a green environmentally-friendly cellulose hydrolysis technology.

Description

technical field [0001] The invention belongs to the field of preparation of solid catalysts, and relates to a preparation method of a solid acid catalyst, in particular to a preparation method of a magnetic enzyme-like carbon-based solid acid catalyst. Background technique [0002] As we all know, biomass is a renewable resource with a wide range of sources, abundant reserves and low price. It is mainly composed of cellulose, hemicellulose and lignin. Among them, cellulose is the most abundant component in biomass. point. At present, the directional conversion of cellulose into various high-quality liquid fuels (such as 2,5-dimethylfuran, ethyl levulinate, 5-ethoxymethylfurfural and long-chain alkanes), high Value-added chemicals (such as 5-hydroxymethylfurfural and levulinic acid) and multifunctional material monomers (2,5-furandimethanol, 2,5-furandicarbaldehyde, and 2,5-furandicarboxylic acid) have become It is one of the most commonly used and ideal ways to utilize bio...

Claims

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Application Information

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IPC IPC(8): B01J31/28C13K1/02
Inventor 胡磊吴真许家兴周守勇徐继明戴本林徐宁
Owner HUAIYIN TEACHERS COLLEGE
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