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Method for catalytically depolymerizing lignin

A catalytic depolymerization and lignin technology, applied in the field of biomass catalytic conversion, can solve the problems of difficult separation and purification, harsh reaction conditions, harsh depolymerization conditions, etc., achieve good hydrothermal stability, complete reaction, and increase conversion rate Effect

Active Publication Date: 2018-05-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as harsh reaction conditions and low product yield in the above-mentioned method.
[0005] The preparation of liquid fuels from lignin has also achieved rapid development in recent years, but the yield is low, and the depolymerization conditions are harsh, the products are complex, separation and purification are difficult, and it is difficult to industrialize

Method used

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  • Method for catalytically depolymerizing lignin
  • Method for catalytically depolymerizing lignin
  • Method for catalytically depolymerizing lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take a certain amount of tantalum oxide, molybdenum oxide and lithium carbonate, put them in a mortar and grind them evenly, then put them into a porcelain boat, and calcinate at 600°C for 24 hours. The molar ratio of tantalum oxide, molybdenum oxide and lithium carbonate is 1:2:2 . Put the calcined catalyst into a 1mol / L nitric acid solution for shaking and impregnation, shake it gently at room temperature for 2 weeks, replace the lithium ions between the catalyst layers with hydrogen ions, then centrifuge, wash the catalyst with deionized water, and wash the catalyst at 70 Dry in an oven at ℃, and grind to get the layered catalyst HTaMoO in the form of light yellow powder 6 , the preparation of the catalyst is complete.

Embodiment 2

[0055] Take a certain amount of niobium oxide, molybdenum oxide and lithium carbonate, put them in a mortar and grind them evenly, then put them into a porcelain boat, and calcinate at 580°C for 24 hours. The molar ratio of niobium oxide, molybdenum oxide and lithium carbonate is 1:2:2 . Put the calcined catalyst into a 1mol / L nitric acid solution for shaking and impregnation, shake it gently at room temperature for 2 weeks, replace the lithium ions between the catalyst layers with hydrogen ions, then centrifuge, wash the catalyst with deionized water, and wash the catalyst at 70 Dry in an oven at ℃, and grind to obtain a layered catalyst HNbMoO in the form of light yellow powder 6 , the preparation of the catalyst is complete.

Embodiment 3

[0057] Take a certain amount of tantalum oxide, tungsten oxide and lithium carbonate, put them in a mortar and grind them evenly, then put them into a porcelain boat, and calcinate at 900°C for 24 hours. The molar ratio of tantalum oxide, tungsten oxide and lithium carbonate is 1.1:2:2 . Put the calcined catalyst into a 1mol / L nitric acid solution for shaking and impregnation, shake it gently at room temperature for 2 weeks, replace the lithium ions between the catalyst layers with hydrogen ions, then centrifuge, wash the catalyst with deionized water, and wash the catalyst at 70 Dry in an oven at ℃, grind to get the layered catalyst HTaWO in the form of light yellow powder 6 , the preparation of the catalyst is complete.

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PUM

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Abstract

The invention provides a method for catalytically depolymerizing lignin. The method comprises the following step: catalytically depolymerizing lignin by adopting a catalyst which is a layered solid acid catalyst. Lignin is catalytically depolymerized by the layered solid acid catalyst, the lignin conversion rate is higher, the reaction is complete, and the layered solid acid catalyst used in the reaction can be recycled, and higher yield of liquid fuel components can be obtained with the method. The catalyst is separated from a depolymerized product easily, and the method is environmentally friendly and has great significance for establishing a sustainable energy system and protecting the ecological environment.

Description

technical field [0001] The invention relates to the technical field of biomass catalytic conversion, in particular to a method for catalytically depolymerizing lignin. Background technique [0002] Lignin is an amorphous natural polymer compound with a three-dimensional network structure, composed of phenylpropanyl basic units, mainly present in woody tissues, and is the main component of plants. At the same time, in lignocellulose, the content of lignin accounts for about 15% to 25%, but the energy contained in it accounts for nearly 40%. Therefore, lignin has received more and more attention with the decreasing fossil energy sources. [0003] As a natural aromatic polymer with a three-dimensional network structure, lignin is mainly composed of three basic units of coniferyl alcohol, sinapyl alcohol and p-hydroxycoumaryl alcohol connected by carbon-carbon bonds and ether bonds, so it can be depolymerized lignin to obtain a variety of high value-added compounds. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J23/30B01J23/20B01J37/08B01J37/02B01J37/30C10G1/00
CPCB01J23/002B01J23/20B01J23/28B01J23/30B01J37/0036B01J37/0201B01J37/08B01J37/30C10G1/00C10G2300/1014
Inventor 李文志晋乐乐王辉珍刘琪英马隆龙张琦韦翔骞
Owner UNIV OF SCI & TECH OF CHINA
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