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Lignin carbon nano-microsphere palladium-loaded catalyst and preparation method and application thereof

A technology of nano-microspheres and lignin carbon, which is applied in the direction of catalyst activation/preparation, cyanide reaction preparation, chemical instruments and methods, etc. It can solve the problem of low catalytic performance of carbon-palladium catalysts, difficulty in maintaining microscopic morphology, poor dispersion performance, etc. problems, to achieve the effect of low preparation cost, good practical application value and good dispersion performance

Inactive Publication Date: 2017-01-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies at home and abroad on the preparation of carbon nanospheres from pure lignin as a carbon source and the preparation of supported palladium catalysts. Poor, the prepared carbon-palladium catalyst has low catalytic performance, which limits its application

Method used

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  • Lignin carbon nano-microsphere palladium-loaded catalyst and preparation method and application thereof
  • Lignin carbon nano-microsphere palladium-loaded catalyst and preparation method and application thereof
  • Lignin carbon nano-microsphere palladium-loaded catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weighing commercial lignin, using N,N-dimethylformamide as a solvent, configured as a lignin electrostatic spray solution with a lignin mass fraction of 35%;

[0033] (2) the lignin electrostatic spraying solution of step (1) is transferred in the equipment of electrostatic spraying, is 25kv at static voltage, and receiving distance is 15cm, carries out electrostatic spraying under the condition that the propulsion speed of electrostatic spraying solution is 3ml / h, Obtain lignin nano-microspheres;

[0034] (3) The obtained lignin nanospheres are placed in a tube furnace, and the lignin nanospheres are preoxidized at a preoxidation temperature of 280° C. The preoxidation is carried out in air, and the heating rate is 0.2° C. / min, the pre-oxidation time is 2h;

[0035] (4) Carbonize the above-mentioned pre-oxidized lignin nano-microspheres, the carbonization temperature is 800°C, carbonization is carried out in nitrogen, the heating rate is 2°C / min, and the carboniz...

Embodiment 2

[0039] (1) Weigh commercial lignin, use N,N-dimethylformamide as a solvent, and configure it as a lignin electrostatic spray solution with a lignin mass fraction of 45%;

[0040] (2) the lignin electrostatic spraying solution of step (1) is transferred in the equipment of electrostatic spraying, is 15kv at static voltage, and receiving distance is 15cm, carries out electrostatic spraying under the condition that the propulsion speed of electrostatic spraying solution is 3ml / h, Obtain lignin electrostatically sprayed nano microspheres;

[0041] (3) Place the obtained lignin electrostatically sprayed nano-microspheres in a tube furnace, and pre-oxidize the lignin nano-microspheres at a pre-oxidation temperature of 260 ° C. The pre-oxidation is carried out in air, and the heating rate is 0.5°C / min, pre-oxidation time is 2h;

[0042] (4) Carbonize the above-mentioned pre-oxidized lignin nano-microspheres, the carbonization temperature is 400°C, the carbonization is carried out in...

Embodiment 3

[0046] (1) Weigh commercial lignin, use N,N-dimethylformamide as a solvent, and configure it as a lignin electrostatic spray solution with a lignin mass fraction of 35%;

[0047] (2) the lignin electrostatic spraying solution of step (1) is transferred in the equipment of electrostatic spraying, is 15kv at static voltage, and receiving distance is 10cm, carries out electrostatic spraying under the condition that the propulsion speed of electrostatic spraying solution is 2ml / h, Obtain lignin electrostatically sprayed nano microspheres;

[0048] (3) The obtained lignin electrostatically sprayed nano-microspheres are placed in a tube furnace, and the lignin nano-microspheres are pre-oxidized at a pre-oxidation temperature of 280 ° C. The pre-oxidation is carried out in air, and the heating rate is 0.2 ℃ / min, pre-oxidation time is 2h;

[0049](4) Carbonize the above-mentioned pre-oxidized lignin electrostatically sprayed nano microspheres, the carbonization temperature is 800 ° C...

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Abstract

The invention belongs to the technical field of catalytic materials, and discloses a lignin carbon nano-microsphere palladium-loaded catalyst and a preparation method and application thereof. The preparation method comprises the steps that lignin is dissolved into N,N-dimethyl formamide to obtain a lignin electrostatic spraying solution, and then after electrostatic spraying is conducted, lignin nano-microspheres are obtained; the obtained lignin nano-microspheres are pre-oxidized at the temperature of 250 DEG C to 280 DEG C and then carbonized at the temperature of 400 DEG C to 900 DEG C to obtain lignin carbon nano-microspheres, and the lignin carbon nano-microspheres are loaded with palladium nanoparticles to obtain the lignin carbon nano-microsphere palladium-loaded catalyst. According to the preparation method, the raw materials are easy to obtain, energy conversation and environmental friendliness are achieved, the obtained product is good in microstructure, dispersing performance and catalytic performance and can be applied to a marinated aromatic catalytic nitrile substitution reaction.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a palladium catalyst supported by lignin carbon nanometer microspheres and its preparation method and application. Background technique [0002] In recent years, how to effectively and fully use abundant, renewable and environmentally friendly lignin resources to alleviate severe energy and environmental problems has attracted extensive attention from researchers. [0003] As one of the most widely existing resources in nature, lignin is the second largest amorphous polyphenolic polymer in the plant kingdom after cellulose. It is a renewable, green and environmentally friendly natural polymer material. Commercial lignin, as a by-product of papermaking industry, exists in papermaking black liquor, and is rarely further processed and utilized, resulting in waste of resources and even environmental problems. Lignin molecules are rich in carbon content, so t...

Claims

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Application Information

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IPC IPC(8): B01J23/44C07C253/14C07C255/54
CPCC07C253/14B01J23/44B01J37/0236B01J37/084B01J37/14B01J37/342B01J35/51C07C255/54Y02P20/10
Inventor 彭新文周子丹钟林新吴锡鹏孙润仓
Owner SOUTH CHINA UNIV OF TECH
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