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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 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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  • Summary
  • 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 method for preparing a core-shell structure magnetic carbon-based solid acid catalyst, which includes the following steps: using a co-precipitation method to prepare magnetic particles Fe 3 O 4 , add buffer and anionic surfactant to the magnetic particles Fe 3 O 4 The size and surface characteristics are modified to obtain magnetic powder Fe 3 O 4 , and then the magnetic powder Fe 3 O 4 Grind mixed with bio-based materials, in N 2 Under a protective atmosphere, carbonize for 2 to 6 hours at a temperature of 350 to 550°C; grind and pulverize the carbonized mixture, add a sulfonating agent, and sulfonate for 5 to 15 hours at a temperature of 60 to 160°C to obtain the mixture, which is then passed through an external magnet. After adsorption, washing and drying, a core-shell structure magnetic carbon-based solid acid catalyst is obtained. The preparation process of the invention is simple, and the prepared catalyst has strong magnetism, high activity, easy recovery, good stability and good reusability, and has good catalytic effect in the reaction of catalyzing the depolymerization of lignocellulosic biomass raw materials to prepare fermentable sugars. active.

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
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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