Preparation and application of polydopamine-derived carbon-based tar cracking catalyst

A polydopamine carbon-based tar and cracking catalyst technology, which is applied in the direction of physical/chemical process catalysts, cracking, metal/metal oxide/metal hydroxide catalysts, etc., to achieve enhanced catalytic effects, increased reaction time, and low cost effects

Pending Publication Date: 2022-05-03
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to provide a porous carbon-Fe3O4 tar cracking catalyst with a regular pore structure for improving t

Method used

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  • Preparation and application of polydopamine-derived carbon-based tar cracking catalyst
  • Preparation and application of polydopamine-derived carbon-based tar cracking catalyst
  • Preparation and application of polydopamine-derived carbon-based tar cracking catalyst

Examples

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Embodiment 1

[0026] Figure 1 to Figure 5 An embodiment of the preparation method of a novel polydopamine carbon-based tar cracking catalyst of the present invention is shown.

[0027] A preparation method of a novel porous carbon-based tar catalyst, the catalyst is based on a polydopamine carbon material as a carrier, and the surface supports Fe3O4, and its preparation steps are as follows:

[0028] a) Preparation of polydopamine: firstly, a mixed solution of absolute ethanol-deionized water was prepared at a volume ratio of 2:5, and then a certain amount of ammonia water was added to the above solution. Add a certain amount of dopamine hydrochloride under the condition of slow stirring. The reaction was stirred slowly at room temperature for 24 h, the obtained solution was centrifuged at 6000 rpm for 10 min, and the obtained solid was washed three times with deionized water. Finally, the washed sample was dried in a vacuum oven at 60°C for 12 hours, and the obtained sample was designat...

Embodiment 2

[0034] This example shows the novel porous carbon-Fe3O4 tar cracking catalyst obtained by the preparation method described in the example of the present invention.

[0035] The organic combination of porous carbon and Fe3O4 not only overcomes the problem of insufficient tar catalytic performance of porous carbon at medium and low temperatures, but also improves the agglomeration / sintering of Fe3O4 during the catalytic process, expanding the application potential of porous carbon in tar catalysis.

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Abstract

The invention relates to the field of preparation and application of a polydopamine-derived carbon-based catalyst, in particular to a preparation method of a tar cracking catalyst used in a biomass gasification process. The preparation method is characterized by comprising the following steps: pyrolyzing a polydopamine raw material in an inert atmosphere and activating in a water vapor atmosphere to obtain a porous carbon material with a relatively large specific surface area, synthesizing and calcining an iron precursor Fe (NO3) 3.9 H2O to obtain Fe3O4 nano-particles, and synthesizing the porous carbon-Fe3O4 tar cracking catalyst from porous carbon and the Fe3O4 nano-particles at a proper temperature. The porous carbon has a rich pore structure and can play a relatively strong role in adsorbing and catalyzing tar, and the Fe3O4 contains lattice oxygen, so that the catalytic performance of the porous carbon catalyst at medium and low temperatures can be improved. The porous carbon and the Fe3O4 nanoparticles are organically combined, so that the defect that the tar catalytic effect of the porous carbon is relatively weak at low temperature is overcome, the problem that Fe3O4 is easy to sinter/agglomerate can be solved, and the application potential of the porous carbon in tar catalytic cracking is expanded.

Description

technical field [0001] The invention relates to the preparation and application field of a polydopamine-derived metal carbon-based biomass tar cracking catalyst, in particular to a preparation method for a tar cracking catalyst used in a biomass gasification process. Background technique [0002] Tar is one of the inevitable products in the process of biomass gasification. As the temperature of syngas produced by gasification decreases, tar will condense and adhere to equipment and pipelines, which will cause great harm to the stable operation of the system. Catalytic cracking is considered to be one of the best tar removal methods. By adding a catalyst to reduce the activation energy of the reaction, the tar is converted into light gas at a lower temperature, thereby reducing the tar content in the gas. Due to their rich pore structure, large specific surface area and abundant functional groups on the surface, porous carbon materials have high adsorption selectivity and aff...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/10C10G11/04
CPCB01J23/745B01J35/10B01J35/1004C10G11/04
Inventor 叶超王齐松叶泽甫朱竹军汤元君董聪许友生王勤辉
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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