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Lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as preparation method thereof and application of catalyst in lignin depolymerization

A lignin-based, carrier-loaded technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of easy repolymerization of products and easy loss of active components and other problems, to achieve the effects of desorption, excellent activity, and increase in specific surface area

Active Publication Date: 2019-07-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages and deficiencies of the catalyst prepared by using activated carbon as the carrier in the lignin degradation process above, the active components are easy to lose and the product is easy to repolymerize, and the surface morphology, pore size and metal activity of the catalyst carrier are better regulated. Dispersion of components, the primary purpose of the present invention is to provide a preparation method of lignin-based nano flower porous carbon carrier loaded Ru-based catalyst

Method used

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  • Lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as preparation method thereof and application of catalyst in lignin depolymerization
  • Lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as preparation method thereof and application of catalyst in lignin depolymerization
  • Lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as preparation method thereof and application of catalyst in lignin depolymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0054] (1) Weigh 1 mass part of alkali lignin, weigh 0.5 mass part of magnesium oxide and add it to 20 volume parts of water, and continue stirring for 1 h at a speed of 300-500 rpm to form a uniform gray-yellow mixture.

[0055] (2) The mixture was transferred to a microwave reactor, raised to 200° C. for 5 minutes at a rate of 10° C. / min, and reacted for 5 minutes to obtain a light yellow mixture.

[0056] (3) Put the light yellow mixture into a freeze dryer at -50°C and dry for 24 hours to obtain a composite of lignin and magnesium oxide.

[0057] (4) transfer the compound obtained into the tube furnace, under N 2 Under the atmosphere of 3°C / min, the temperature was raised to 400°C at a constant temperature of 1h to obtain a black solid. After the calcined product was ground, it was mixed with 200 volume parts (2mol / L) of HCl, stirred at a speed of 400rpm for 12h, and statically After standing for 24 hours, filter, wash with water until neutral, and dry at 50° C. for 24 ho...

Embodiment 2

[0062] (1) Weigh 1 mass part of enzymatic lignin, weigh 5 mass parts of magnesium oxide and add it to 30 volume parts of water, and continue to stir for 1 h at a speed of 300-500 rpm to form a uniform gray-yellow mixture.

[0063] (2) The mixture was transferred to a microwave reactor, and raised to 100°C for 10 minutes at a heating rate of 60°C / min to obtain a light yellow mixture.

[0064] (3) Put the light yellow mixture into a freeze dryer at -50°C and dry for 24 hours to obtain a composite of lignin and magnesium oxide.

[0065] (4) transfer the compound obtained into the tube furnace, under N 2 Under an atmosphere of 15°C / min, the temperature was raised to 800°C at a constant temperature of 6h to obtain a black solid. After the calcined product was ground, it was mixed with 200 parts by volume (2mol / L) of HCl, stirred at a speed of 400rpm for 12h, and statically After standing for 24 hours, filter, wash with water until neutral, and dry at 50° C. for 24 hours to obtain ...

Embodiment 3

[0070] (1) Weigh 1 part by mass of the organic solvent lignin, add 1 part by mass of magnesium oxide into 30 parts by volume of water, and continue stirring for 1 hour at a speed of 300-500 rpm to form a uniform gray-yellow mixture.

[0071] (2) The mixture was transferred to a microwave reactor and raised to 50°C for 30 minutes at a heating rate of 20°C / min to obtain a light yellow mixture.

[0072] (3) Put the light yellow mixture into a freeze dryer at -50°C and dry for 24 hours to obtain a composite of lignin and magnesium oxide.

[0073] (4) transfer the compound obtained into the tube furnace, under N 2Under an atmosphere of 10°C / min, the temperature was raised to 600°C at a constant temperature of 1h to obtain a black solid, and the calcined product was ground and mixed with 200 volume parts (2mol / L) of HCl, stirred at a speed of 400rpm for 12h, and statically After standing for 24 hours, filter, wash with water until neutral, and dry at 50° C. for 24 hours to obtain t...

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Abstract

The invention belongs to the technical field of metal solid catalysts, and discloses a lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as a preparation method thereofand an application of the catalyst in lignin depolymerization. The preparation method comprises the following steps: lignin is used as a carbon source, magnesium oxide is used as a template agent, and a mixed solution system containing the lignin and the magnesium oxide is treated by utilizing microwaves to obtain a lignin and magnesium oxide precursor complex; and high-temperature calcination isperformed to obtain a lignin-based nanoflower porous carbon carrier, and an active component Ru is supported by using an impregnation method to prepare the lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst. The obtained catalyst provided by the invention has a structure which is composed of a large number of irregular pleated nanoflowers and has developed pore channels andthe characteristics of smaller supported ruthenium nanoparticles (1.5-6 nm), a large specific surface area (5-180 m<2> / g), high dispersity and high stability, can be applied to the lignin depolymerization and exhibit excellent activity, and has a monophenol yield of 26.8% and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of metal solid catalysts, in particular to a lignin-based nanoflower porous carbon carrier loaded Ru-based catalyst, a preparation method thereof, and an application in lignin depolymerization. Background technique [0002] With the massive exploitation of fossil energy, a series of energy crisis, ecological crisis and environmental pollution problems have been caused. From the perspective of energy utilization, lignocellulose, which is composed of lignin, cellulose and hemicellulose, has the greatest utilization potential. good substitute. Cellulose and hemicellulose have relatively simple structures and can be converted into small molecular compounds such as ethanol, ethylene glycol and furfural or converted into high-value fuels such as gasoline, diesel and aviation fuel through chemical or biological methods. Due to the complexity and stability of its structure, lignin is difficult to use effectively. ...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/02B01J35/10C07C41/01C07C43/23
CPCB01J23/462C07C41/01B01J35/612B01J35/60B01J35/613B01J35/615C07C43/23
Inventor 欧阳新平李天津邱学青杨东杰陈博
Owner SOUTH CHINA UNIV OF TECH
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