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Method for catalyzing hydrolysis of lignocellulose by heteropoly acid

A technology of lignocellulose and heteropolyacids, applied in sugar production, xylose production, sugar production, etc., can solve problems that need to be improved

Inactive Publication Date: 2017-05-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The currently reported reaction catalytic systems include: inorganic acid catalytic systems such as sulfuric acid and hydrochloric acid, organic acid catalytic systems such as formic acid, and reaction systems such as acidic resins and enzyme catalysis. However, the overall reaction efficiency still needs to be improved, and more and more efficient catalytic systems should be developed. is extremely meaningful

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  • Method for catalyzing hydrolysis of lignocellulose by heteropoly acid
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  • Method for catalyzing hydrolysis of lignocellulose by heteropoly acid

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preparation example Construction

[0027] The preparation method of the supported heteropolyacid catalyst is a preparation method well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably prepared according to the following method: the carrier is immersed in the solution containing the active ingredient, and the The solvent is dried to obtain a loaded heteropolyacid catalyst. The solution containing the active ingredient is preferably obtained by dissolving the active ingredient in a volatile solvent; the volatile solvent is preferably an alcohol solvent, more preferably ethanol; in the present invention, it is preferred to first mix the carrier with the volatile solvent, and then add The solution containing the active ingredient is then preferably stirred at room temperature for 1 to 10 hours, more preferably at room temperature for 3 to 10 hours, then preferably at room temperature for 6 to 10 hours, most preferably at room temperature for 8 hours, t...

Embodiment 1

[0038] Preparation of heteropolyacids:

[0039] The preparation method of the heteropolyacid salt is a co-precipitation method. with Cs x h y PW 12 o 40 Take the catalyst as an example. Dissolve 0.5g of phosphotungstic acid in 10mL of water in a flask, then slowly add 5mL of aqueous solution containing the required amount of cesium carbonate to the solution under stirring, stir at room temperature for 6h, and then use a Buchner funnel to Extract and wash with water for 3 to 5 times, and dry under vacuum at 70°C overnight.

[0040] The preparation method of the heteropolyacid salt catalyst is not particularly limited in the present invention, and is a method well known to those skilled in the art.

Embodiment 2

[0042] Preparation of supported heteropolyacid catalyst:

[0043] The preparation method of HPW supported catalyst is impregnation method. With 50%HPW / SiO 2 As an example, dissolve 0.5g of phosphotungstic acid (HPW) in 10mL of ethanol, then slowly add the solution to a volume containing 20mL of ethanol and 1g of SiO 2 in a flask, stirred at room temperature for 8 hours, spin-dried, and dried overnight at 120°C to obtain a supported heteropolyacid catalyst.

[0044] The preparation method of the HPW-supported catalyst system is not particularly limited in the present invention, and is a method well known to those skilled in the art.

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Abstract

The invention provides a method for catalyzing hydrolysis of lignocellulose by heteropoly acid. The method comprises the following steps: mixing plant biomass, a heteropoly acid catalyst and a reaction solvent; carrying out hydrolysis reaction to obtain a hydrolysis product, wherein the hydrolysis product comprises monosaccharides; the heteropoly acid catalyst is one or more of heteropoly acid, heteropoly acid salt and a supported heteropoly acid catalyst; the supported heteropoly acid catalyst comprises a carrier and an active component supported on the carrier; the active component is the heteropoly acid and / or the heteropoly acid salt; the reaction solvent is water or a water-containing mixed solvent. Compared with the prior art, the method has the advantages that the heteropoly acid catalyst is used for catalyzing the hydrolysis of the lignocellulose, the heteropoly acid is strong protonic acid which can be used for catalyzing the hydrolysis of the plant biomass by hydrogenation, and high-selectivity hydrolysis of a glucosidic bond in polysaccharides is catalyzed efficiently to prepare the monosaccharides; the method has the advantages of mild reaction conditions, easiness in operation, adoption of cheap and readily-available catalyst, recyclability, and easiness in scale production.

Description

technical field [0001] The invention belongs to the technical field of biomass energy, in particular to a method for catalyzing lignocellulose hydrolysis with heteropolyacids. Background technique [0002] With the advancement of science and technology, the human demand for energy and resources is also increasing. As the most important energy source at this stage, the availability and sustainability of fossil fuels (such as coal, oil, and natural gas) have certain limitations, and their combustion will lead to a series of ecological and environmental problems such as greenhouse effect and air pollution. Negative impact. Biomass refers to the general term for substances synthesized by plants, animals or microorganisms, of which plant biomass is the most important part. [0003] Plant biomass, also known as lignocellulosic biomass, mainly includes wood, agricultural and forestry waste, grass and urban plant fiber waste, etc. It is the only renewable carbon resource in nature...

Claims

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Application Information

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IPC IPC(8): C13K1/02C13K13/00
CPCC13K1/02C13K13/002
Inventor 傅尧刘新鑫陈蒙远严龙
Owner UNIV OF SCI & TECH OF CHINA
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