Preparation method of lignin based carbon loaded nano metal oxide catalyst

A nano-metal, lignin-based technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the waste of lignin biomass waste resources, load Low capacity, complex operation and other issues, to achieve the effect of improving technological content and value-added applications, increasing load capacity, and avoiding environmental pollution

Pending Publication Date: 2019-01-15
YANGTZE NORMAL UNIVERSITY
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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a simple and efficient preparation method of lignin-based carbon-supported nano-sized metal oxide catalysts, which solves the problem of the existing preparation methods of porous carbon-supported nano-sized metal oxide catalysts. There are problems such as complex operation, low loading capacity, environmental pollution and high cost, and it also solves the problems of resource waste and environmental pollution of lignin biomass waste

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  • Preparation method of lignin based carbon loaded nano metal oxide catalyst
  • Preparation method of lignin based carbon loaded nano metal oxide catalyst
  • Preparation method of lignin based carbon loaded nano metal oxide catalyst

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Embodiment 1

[0033] 1) Dissolve lignin in water to prepare a lignin solution of 1 mg / L, then add ferric chloride to the lignin solution, the amount of ferric chloride is 5% of the lignin mass, stir evenly to obtain a mixed solution, Then the mixed solution was frozen in liquid nitrogen at -196°C, and dried in a freeze dryer at -70°C for 72 hours to prepare an airgel;

[0034] 2) The airgel prepared in step 1) was placed in a tube furnace and heat-treated at 1000°C in an argon atmosphere for 1 hour, and after cooling, a microscopic fibrous lignin-based carbon airgel loaded with iron and four Catalyst of ferric oxide nanoparticles with a yield of 11.2% and a specific surface area of ​​717m 2 / g.

Embodiment 2

[0036] 1) Dissolve lignin in water to prepare a 5 mg / L lignin solution, then add ferric chloride to the lignin solution, the amount of ferric chloride is 5% of the lignin mass, stir evenly to obtain a mixed solution, and then The mixed solution was frozen in liquid nitrogen at -196°C, and dried in a freeze dryer at -70°C for 72 hours to prepare an airgel;

[0037] 2) The airgel prepared in step 1) was placed in a tube furnace for heat treatment at 750 °C in an argon atmosphere for 1 hour, and after cooling, a microscopic sheet-like lignin-based carbon airgel loaded with iron and tetracarbonate was obtained. Catalyst of ferric oxide nanoparticles with a yield of 34.5% and a specific surface area of ​​278 m 2 / g.

Embodiment 3

[0039] 1) Dissolve lignin in water to prepare lignin solution of 10 mg / L, then add ferric chloride to the lignin solution, the amount of ferric chloride is 5% of the lignin mass, stir evenly to obtain a mixed solution, then put The mixed solution was frozen in liquid nitrogen at -196°C, and dried in a freeze dryer at -70°C for 72 hours to prepare an airgel;

[0040]2) The airgel prepared in step 1) was placed in a tube furnace and heat-treated at 600°C for 1 hour in an argon atmosphere. Catalyst of Fe3O4 nanoparticles with a yield of 55.0% and a specific surface area of ​​143 m 2 / g.

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Abstract

The invention discloses a preparation method of a lignin based carbon loaded nano metal oxide catalyst. According to the method, lignin is taken as a carbon precursor and is made into a solution, thena metal oxide precursor is added into the solution; the solution is freeze-dried to obtain aerogel; and the aerogel is heated in a tubular furnace and then cooled to obtain the catalyst. Through simple treatments such as freeze-drying, high temperature heat treatment, and the like, the prepared metal oxide catalyst has a nano level size, and metal oxides are efficiently loaded on the surface of alignin based carbon material with a high specific surface area. The preparation method is simple and convenient; the activation process is avoided, thus the energy consumption is reduced, and the environmental pollution is avoided. Moreover, the technological content and additional value of lignin are increased; the application range of lignin is enlarged; lignin can be used as a cheap catalyst carrier; the production efficiency is improved, and the manufacturing cost is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a lignin-based carbon-supported nanometer metal oxide catalyst. Background technique [0002] At present, metal oxide catalytic oxidation technology has been widely used in petrochemical, pharmaceutical, environmental protection, agriculture and other fields, in which nano-sized metal oxide catalysts have significantly superior catalytic efficiency, but the preparation of nano-catalysts is relatively complicated, so The sources are limited and the price is relatively expensive, which affects its deeper and wider application. In recent years, porous carbon materials as catalyst supports have the advantages of large specific surface area, unique pore structure and rich surface functional groups, which can effectively improve the catalytic efficiency of catalysts and improve their catalytic effect, which has attracted widespread attention of scholars. , sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/10B01J21/18B01J23/10B01J23/18B01J23/30B01J23/34B01J23/72
CPCB01J21/18B01J23/10B01J23/18B01J23/30B01J23/34B01J23/72B01J23/745B01J35/10
Inventor 陈凤贵
Owner YANGTZE NORMAL UNIVERSITY
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