Ruthenium and tungsten modified metal solid solution catalyst, and preparation method and lignin depolymerization method thereof

A solid solution and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, oxygen-containing compound preparation, chemical instruments and methods, etc., can solve the problems of difficult product control, complex product types, and complicated post-processing, etc. To achieve the effect of reducing damage, environmental friendliness, and simple separation

Inactive Publication Date: 2020-05-19
UNIV OF SCI & TECH OF CHINA
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The use of homogeneous acid and base catalyzed depolymerization of lignin in the prior art has been widely used, but it inevitably faces some problems, such as complicated post-processing, corrosion of reactors, environmental pollution, etc.
At the same time, the catalytic oxidative depolymerization has brought about the problems that the products are difficult to control and the types of products are complex.
The method of catalytic hydrogenation depolymerization can selectively convert lignin into aromatic compounds, but the low depolymerization efficiency has always been the key problem facing lignin depolymerization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ruthenium and tungsten modified metal solid solution catalyst, and preparation method and lignin depolymerization method thereof
  • Ruthenium and tungsten modified metal solid solution catalyst, and preparation method and lignin depolymerization method thereof
  • Ruthenium and tungsten modified metal solid solution catalyst, and preparation method and lignin depolymerization method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] Correspondingly, an embodiment of the present invention provides a method for preparing a ruthenium and tungsten modified metal solid solution catalyst, comprising the following steps:

[0040]In the first step, the tin source and the aluminum source are mixed in the first solvent, and the precipitate is obtained by adjusting the pH value, and the precipitate is dried, calcined, and ground to obtain tin-aluminum oxide;

[0041] In the second step, the tin-aluminum oxide and the tungsten source are mixed in a second solvent, and then dried, calcined, and ground in sequence to obtain tungsten-modified tin-aluminum oxide;

[0042] In the third step, the tungsten-modified tin-aluminum oxide and the ruthenium source are mixed in a third solvent, and then reduced with a reducing agent to obtain a metal solid solution catalyst modified by ruthenium and tungsten.

[0043] Using the catalyst prepared in the embodiment of the present application to catalyze the depolymerization o...

Embodiment 1

[0070]The first step, stirring and dissolving 15.381g of tin chloride and 19.732g of aluminum nitrate in 50mL of water, using sodium hydroxide solution to adjust the pH to 12, precipitate, filter, and wash the precipitate with distilled water until the pH value is 7-8 In between, stir at room temperature for 3h. The washed solid phase was dried at 80°C for 10h, calcined at 550°C for 3h, and ground.

[0071] In the second step, mix 8g of the oxide obtained in the first step with 1.126g of phosphotungstic acid in 50mL of water, stir at 80°C for 3h, then dry at 80°C for 10h, calcinate at 500°C for 3h, and grind.

[0072] In the third step, 8g of the oxide obtained in the second step and 0.8208g of ruthenium chloride are stirred and mixed in 50mL solvent (a mixed solution of water and ethanol with a volume ratio of 1:1), and 16g of excess sodium borohydride is dropped into it for reduction, at room temperature Stir and reduce for 8h (the reduction parameters in the following exam...

Embodiment 2

[0098] The specific reaction process and detection method are the same as those of Comparative Example 3, except that the input catalyst is 0.1 g of the catalyst prepared in Example 1. The results showed that the yield of aromatic compounds was 7.48%; the yield of petroleum ether extract was 20.19%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention provides a ruthenium and tungsten modified metal solid solution catalyst and a preparation method and a lignin depolymerization method thereof. The catalyst comprises a tin-aluminum metal solid solution carrier, and ruthenium and tungsten which are dispersed on the tin-aluminum metal solid solution carrier. According to the catalyst, a metal solid solution compounded by tin and aluminum is mainly used as a carrier, and the acidity of the catalyst is enhanced by modification of tungsten; the effect of the catalyst is enhanced by ruthenium modification. The ruthenium and tungsten modified metal solid solution catalyst provided by the invention has a synergistic effect of components, and can efficiently depolymerize lignin. By applying the ruthenium and tungsten modified metal solid solution catalyst to catalyze and depolymerize lignin, the damage of the catalyst to a reactor can be reduced, and the depolymerization rate is high. Meanwhile, the yield of aromatic compounds inthe obtained depolymerization product and the yield of small molecular compounds extracted by petroleum ether are high, and separation and purification are simple. The depolymerization product and the catalyst are simple to separate and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of lignocellulosic biomass conversion, in particular to a metal solid solution catalyst modified by ruthenium and tungsten, a preparation method thereof and a method for depolymerizing lignin. Background technique [0002] Biomass is recognized as the best source of renewable organic carbon; biomass is mainly composed of three major components: cellulose, hemicellulose, and lignin. Among them, lignin accounts for about one-third of the three major components of biomass, but unlike cellulose and hemicellulose, lignin has not been well utilized. The structure of cellulose and hemicellulose is relatively simple, while lignin has a complex three-dimensional amorphous structure and is relatively difficult to use. Therefore, many researches and effective conversion and utilization methods are currently focused on cellulose and hemicellulose. Many factories that utilize biomass materials convert the cellulose and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652C07G99/00C07C27/00
CPCB01J23/6527C07C27/00C07G99/00
Inventor 李文志王晋东
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap