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Ni-Ru/AC bimetallic catalyst and preparation method and application thereof in lignin degradation

A bimetallic catalyst, metal catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of low selectivity and disadvantage, and achieve repeated The effect of high availability, low cost and simple manufacturing method

Pending Publication Date: 2020-11-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high activity of Ru-based catalysts but low selectivity, more naphthenic substances will be produced, which is unfavorable for lignin degradation, so the limited combination of Ni and Ru catalysts can better improve the selection of lignin sex and activity

Method used

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  • Ni-Ru/AC bimetallic catalyst and preparation method and application thereof in lignin degradation
  • Ni-Ru/AC bimetallic catalyst and preparation method and application thereof in lignin degradation
  • Ni-Ru/AC bimetallic catalyst and preparation method and application thereof in lignin degradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Weigh 0.51g of nickel nitrate hexahydrate and 5g of deionized water, stir ultrasonically to dissolve them; add 2g of activated carbon powder, stir to make the activated carbon and solution fully mixed to a paste, then immerse and stir at room temperature 25°C for 6h; stir After completion, put it into a vacuum drying oven and dry it at 120°C for 9 hours to obtain a Ni / AC catalyst precursor;

[0040] (2) Put the Ni / AC catalyst precursor prepared in step (1) into a tube furnace, heat and roast at 500°C for 3 hours under the condition of feeding nitrogen gas, wherein the nitrogen gas flow rate is 50ml / min; after the reaction is completed , under the condition of feeding hydrogen at 500°C for 3 hours at high temperature, wherein the hydrogen gas flow rate is 50ml / min, to obtain a 5% Ni / AC catalyst;

[0041] (3) Weigh 0.26g of ruthenium chloride trihydrate and the deionized water of 5g, ultrasonic stirring makes it dissolve, obtains ruthenium chloride solution; Add the N...

Embodiment 2

[0045] (1) Weigh 0.51g of nickel nitrate hexahydrate and 5g of deionized water, stir ultrasonically to dissolve them; add 2g of activated carbon powder, stir to make the activated carbon and solution fully mixed to a paste, then immerse and stir at room temperature 25°C for 6h; stir After completion, put it into a vacuum drying oven and dry it at 110°C for 24 hours to obtain a Ni / AC catalyst precursor;

[0046] (2) Put the Ni / AC catalyst precursor prepared in step (1) into a tube furnace, heat and roast at 500° C. for 3 h under the condition of nitrogen flow, wherein the nitrogen flow rate is 50 ml / min; after the reaction is completed, Reduction at 500°C for 3 hours at a high temperature under the condition of hydrogen flow, wherein the hydrogen gas flow rate is 50ml / min, to obtain a 5% Ni / AC catalyst;

[0047] (3) Weigh 0.15g of ruthenium chloride trihydrate and 5g of deionized water, and ultrasonically stir to dissolve it to obtain a ruthenium chloride solution; add 2g of Ni...

Embodiment 3

[0051] (1) Weigh 0.51g of nickel nitrate hexahydrate and 5g of deionized water, stir ultrasonically to dissolve them, add 2g of activated carbon powder, stir to make the activated carbon and the solution fully mixed into a paste, then immerse and stir at room temperature 25°C for 6h, stir After completion, put it into a vacuum drying oven at 90°C for 20 hours to obtain a Ni / AC catalyst precursor;

[0052] (2) Put the Ni / AC catalyst precursor prepared in step (1) into a tube furnace, heat and roast at a high temperature of 500°C for 3h under the condition of feeding nitrogen, wherein the nitrogen flow rate is 50ml / min; after the reaction is completed, Reduction at 500°C for 3 hours at a high temperature under the condition of feeding hydrogen, wherein the hydrogen flow rate is 50ml / min, to obtain a 5% Ni / AC catalyst;

[0053] (3) Weigh 0.05g of ruthenium chloride trihydrate and 5g of deionized water, and ultrasonically stir to dissolve it to obtain a ruthenium chloride solution...

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Abstract

The invention belongs to the technical field of catalyst preparation, and particularly relates to a Ni-Ru / AC bimetallic catalyst and a preparation method and application thereof in lignin degradation.The preparation method comprises the following steps: dissolving nickel nitrate hexahydrate in water, adding activated carbon, and stirring into paste, then carrying out dipping, stirring, drying, roasting and metal reduction so that a Ni / AC metal catalyst is obtained, dissolving ruthenium chloride trihydrate in water, then adding the Ni / AC metal catalyst, stirring to be pasty, and then carryingout dipping stirring, drying, roasting and metal reduction so that the Ni-Ru / AC bimetallic catalyst is obtained. According to the method, the characteristic that hydrogenation activity of Ni metal hasadvantages in lignin degradation is combined, compared with other catalysts, the catalyst has the advantages of simple preparation method, high degradation efficiency, high reusability and the like,the hydrogenation activity of the Ni metal is directly improved by dipping a small amount of noble metal Ru, and the defect that the Ni metal is easy to inactivate is overcome.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a Ni-Ru / AC bimetallic catalyst and its preparation and application in lignin degradation. Background technique [0002] Due to the increasingly serious environmental problems caused by the excessive use of fossil energy, researchers have begun to pay attention to the development of a new generation of sustainable alternative energy. Lignocellulosic biomass contains cellulose, hemicellulose, and lignin, which have great potential in the production of sustainable alternative energy sources. Compared with cellulose and hemicellulose, lignin is mainly composed of three monomer units ( sinapyl alcohol, coniferyl alcohol, and p-coumaryl alcohol) are polymerized through free radical coupling reactions and C-C and C-O bond linkages, and its structure is distributed in a network. It is considered to be the most abundant natural aromatic polymer. The C-O ether bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/18B01J37/02C07C35/08C07C29/00C07C39/04C07C37/055C07C31/135C07C33/22
CPCB01J23/892B01J37/18B01J37/024C07C29/00C07C37/055C07C2601/14Y02P20/52
Inventor 易舜闵永刚李凯欣
Owner GUANGDONG UNIV OF TECH
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