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Magnetic carbon-based solid acid catalyst with core-shell structure and preparation method of magnetic carbon-based solid acid catalyst, as well as application in lignocelluloses saccharification process

A carbon-based solid acid, lignocellulose technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. The effect of repeated use, avoiding oversized magnetic particles, and simple follow-up processing

Active Publication Date: 2016-12-14
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At the same time, the above-mentioned magnetic carbon-based solid acid catalysts and traditional solid acid catalysts such as molecular sieves and ion exchange resins have better catalytic effects in catalyzing gas-phase and liquid-phase reactions, but they are less used in catalyzing solid-state reactions. , and the catalytic effect is not good

Method used

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  • Magnetic carbon-based solid acid catalyst with core-shell structure and preparation method of magnetic carbon-based solid acid catalyst, as well as application in lignocelluloses saccharification process
  • Magnetic carbon-based solid acid catalyst with core-shell structure and preparation method of magnetic carbon-based solid acid catalyst, as well as application in lignocelluloses saccharification process

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preparation example Construction

[0039] The preparation method of a core-shell structure magnetic carbon-based solid acid catalyst proposed in this application includes the following steps:

[0040] (1) Magnetic powder Fe 3 O 4 Preparation: the molar ratio of Fe 3+ And Fe 2+ Dissolve the two salts in distilled water to mix the solution evenly. Place it in a constant temperature water bath at 65°C. While stirring rapidly, add NaOH solution dropwise to the mixed solution, adjust the pH of the solution to 10-12; continue stirring and add no Water ethanol, the volume ratio of the absolute ethanol to the mixed solution is 1:5, stand still, black particles are observed, that is Fe 3 O 4 Magnetic particles, will contain Fe 3 O 4 Raise the mixed solution of magnetic particles to 80℃, add buffering agent to adjust the pH value of the mixed solution to 4-6, add anionic surfactants while stirring, after standing still, use external magnet to adsorb and precipitate, and the precipitate is washed and dried Magnetic powder Fe ...

Embodiment 1

[0044] 1) Magnetic powder Fe 3 O 4 Preparation: The molar ratio of Fe 3+ And Fe 2+ Dissolve the two salts in a certain amount of distilled water to make the solution evenly mixed. Place it in a constant temperature water bath at 65°C. While stirring rapidly, add NaOH solution (2mol / L) dropwise to the mixed solution to adjust the pH of the solution to 10-12; Continue to stir and add absolute ethanol. The volume ratio of absolute ethanol to the mixed solution is 1:5. After standing for 10 minutes, black particles can be observed, that is, magnetic particles;

[0045] Then, raise the temperature to 80℃, add buffer glacial acetic acid to adjust the mixed solution to pH=4~6, glacial acetic acid and Fe 2+ The molar ratio is 0.4:1. While stirring, add the anionic surfactant oleic acid, oleic acid and Fe 2+ The molar ratio is 0.4:1. After standing for 30 minutes, the precipitate is adsorbed by an external magnet. The precipitate is washed with anhydrous ethanol and deionized water several ...

Embodiment 2

[0056] The molar ratio of Fe 3+ And Fe 2+ Dissolve the two salts in a certain amount of distilled water to make the solution evenly mixed. Place it in a constant temperature water bath at 65°C. While stirring rapidly, add NaOH solution (2mol / L) dropwise to the mixed solution to adjust the pH of the solution to 10-12; Continue to stir and add absolute ethanol. The volume ratio of absolute ethanol to the mixed solution is 1:5. Let it stand for 10 minutes. Black particles can be observed, that is, magnetic particles;

[0057] Then, increase the temperature to 80°C, add buffer sodium acetate to adjust the mixed solution to pH=4~6, sodium acetate and Fe 2+ The molar ratio is 0.5:1. While stirring, add the anionic surfactant sodium oleate, sodium oleate and Fe 2+ The molar ratio is 0.5:1. After standing for 30 minutes, the precipitate is adsorbed by an external magnet. The precipitate is washed with anhydrous ethanol and deionized water several times, dried and calcined to obtain Fe 3 O ...

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Abstract

The invention relates to a preparation method of a magnetic carbon-based solid acid catalyst with a core-shell structure. The preparation method comprises the following steps: preparing magnetic particles Fe3O4 by a coprecipitation method, adding a buffer agent and an anionic surfactant into the magnetic particles Fe3O4, modifying the size and the surface characteristic of the magnetic particles Fe3O4 to obtain magnetic powder Fe3O4, then grinding and mixing the magnetic powder Fe3O4 and a biobased material, and performing carbonization at the temperature of 350 to 550 DEG C under an N2 protection atmosphere for 2 to 6 h; grinding and pulverizing a carbonized mixture, adding a sulfonating agent for sulfonation at the temperature of 60 to 160 DEG C for 5 to 15 h to obtain a mixture, and performing adsorption with an external magnet, washing and drying to obtain the magnetic carbon-based solid acid catalyst with the core-shell structure. The preparation process disclosed by the invention is simple in process; the prepared catalyst is high in magnetism, high in activity, easy to recycle, high in stability and high in reusability, and is high in catalysis activity in the reaction of preparing fermentable sugars by catalyzing the depolymerization of a lignocelluloses biomass raw material.

Description

Technical field [0001] The invention belongs to the technical field of solid acid catalysts, and specifically relates to a core-shell structure magnetic carbon-based solid acid catalyst, a preparation method thereof, and application in a lignocellulose hydrolysis and saccharification process. Background technique [0002] The solid catalyst is easy to separate from the main body of the liquid phase and reused, which effectively reduces the use of the catalyst and the subsequent environmental pressure and processing costs brought by it, and has attracted extensive attention from researchers. As an important branch, solid acid catalysts have been widely used in various reactions. Carbon-based solid acid has the advantages of high thermal stability, high catalytic activity, and good reusability, and has become one of the hot spots in the field of solid acid research. People have developed polycyclic aromatic hydrocarbons, sugars (such as glucose, sucrose, etc.), natural substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02B01J31/04B01J31/28C13K13/00C13K1/02
CPCC13K1/02C13K13/002B01J27/02B01J31/04B01J31/28B01J35/33
Inventor 亓伟张续成袁振宏王琼谭雪松王闻余强庄新姝马隆龙王忠铭
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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