A core-shell structure magnetic carbon-based solid acid catalyst and its preparation method and application in lignocellulose hydrolysis and saccharification process

A carbon-based solid acid, lignocellulose technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of less application of catalytic solid reactions and poor catalytic effect, etc. The magnetic particle size is too large, the repeated use times are increased, and the catalytic activity is good.

Active Publication Date: 2019-06-11
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A core-shell structure magnetic carbon-based solid acid catalyst and its preparation method and application in lignocellulose hydrolysis and saccharification process
  • A core-shell structure magnetic carbon-based solid acid catalyst and its preparation method and application in lignocellulose hydrolysis and saccharification process

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preparation example Construction

[0039] A method for preparing a magnetic carbon-based solid acid catalyst with a core-shell structure comprising the following steps:

[0040] (1) Magnetic powder Fe 3 o 4 The preparation of: Fe with a molar ratio of 1.5 to 2:1 3+ and Fe 2+ Dissolve the two salts in distilled water, mix the solution evenly, place it in a 65°C constant temperature water bath, add NaOH solution dropwise to the mixed solution while stirring rapidly, and adjust the pH value of the solution to 10-12; continue stirring and add Water ethanol, the volume ratio of described dehydrated alcohol and mixed solution is 1:5, stand still, observe black particle, be Fe 3 o 4 Magnetic particles, will contain Fe 3 o 4 Raise the mixed solution of magnetic particles to 80°C, add a buffer to adjust the pH value of the mixed solution to 4-6, add an anionic surfactant while stirring, after standing still, use an external magnet to absorb the precipitate, and the precipitate is washed and dried Magnetic powder ...

Embodiment 1

[0044] 1) Magnetic powder Fe 3 o 4 Preparation: Fe with a molar ratio of 1.5:1 3+ and Fe 2+ Dissolve the two salts in a certain amount of distilled water, mix the solution evenly, place it in a constant temperature water bath at 65°C, add NaOH solution (2mol / L) dropwise to the mixed solution while stirring rapidly, and 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, and black particles can be observed, which are magnetic particles;

[0045] Then, the temperature was raised to 80°C, and the buffering agent glacial acetic acid was added to adjust the mixed solution to pH=4-6, and the glacial acetic acid and Fe 2+ The molar ratio of 0.4:1, while stirring, add anionic surfactant oleic acid, oleic acid and Fe 2+ The molar ratio is 0.4:1. After standing for 30 minutes, use an external magnet to absorb the precipitate. The precipitate is washed with a...

Embodiment 2

[0056] Fe with a molar ratio of 2:1 3+ and Fe 2+ Dissolve the two salts in a certain amount of distilled water, mix the solution evenly, place it in a constant temperature water bath at 65°C, add NaOH solution (2mol / L) dropwise to the mixed solution while stirring rapidly, and 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, and black particles can be observed, which are magnetic particles;

[0057] Then, the temperature was raised to 80°C, and the buffering agent sodium acetate was added 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, use an external magnet to absorb the precipitate. The precipitate is washed with absolute ethanol and deionized water for many times, ...

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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 in particular relates to a magnetic carbon-based solid acid catalyst with a core-shell structure, a preparation method thereof, and an application in a lignocellulose hydrolysis and saccharification process. Background technique [0002] Solid catalysts are easy to separate from the liquid phase and reused, which effectively reduces the use of catalysts and subsequent environmental pressure and disposal costs, and has attracted extensive attention from researchers. As an important branch, solid acid catalysts have been widely used in various reactions. Carbon-based solid acids have the advantages of high thermal stability, high catalytic activity, and good reusability, and have become one of the hotspots in the field of solid acid research today. People have developed polycyclic aromatic hydrocarbons, sugars (such as glucose, sucrose, etc.), natural substances (such as wood, cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/02B01J31/04B01J31/28C13K13/00C13K1/02
CPCB01J27/02B01J31/04B01J31/28B01J35/0033C13K1/02C13K13/002
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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