Preparation method of biomass-derived porous carbon confinement monatomic metal composite material

A metal composite material, porous carbon technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of poor coordination stability of heteroatoms, metal active components Easy to aggregate, difficult to scale production and other problems, to achieve the effects of low cost, improved catalytic activity and electronic conductivity, and improved stability

Inactive Publication Date: 2021-06-08
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the technical problems to be solved by the present invention is: to solve the problems such as complex preparation process of single-atom catalysts, easy aggregation of metal active components, and poor catalytic stability; the second technical problem to be solved by the present invention is to use biomass-derived porous carbon as Support, to overcome the problems of complex preparation steps, high cost of raw materials, poor coordination stability between metal salts and heteroatoms in carbon supports, and difficulty in large-scale production of single-atom metal catalytic materials in traditional existing preparation methods

Method used

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  • Preparation method of biomass-derived porous carbon confinement monatomic metal composite material
  • Preparation method of biomass-derived porous carbon confinement monatomic metal composite material
  • Preparation method of biomass-derived porous carbon confinement monatomic metal composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Precursor preparation process: phthalocyanine (0.412g) and iron phthalocyanine (0.228g) were dispersed in ethanol / tetrahydrofuran (100mL / 100mL) mixture, and complexed with stirring at 25°C for 5h. Subsequently, a homogeneous suspension of pomelo peel powder / isopropanol (0.3 g / 200 mL) was mixed into the above mixed solution, and stirred at 25° C. for 12 h. The mixed solution was placed in an 85°C water bath to evaporate the solvent while stirring, and then the sample after the solvent evaporation was baked at 100°C for 48 hours to obtain a precursor.

[0030](2) Carbonization process: the precursor obtained in step (1) was placed in a tube furnace for direct pyrolysis (the pyrolysis temperature was 600 °C, the pyrolysis time was 1 h, and the heating rate was 5 °C min -1 , N 2 The gas flow rate is 0.2 mL / min). The pyrolysis product was acid-washed in 2mol / L, 100mL nitric acid solution at 25°C for 12h, the obtained catalyst was centrifuged three times with ethanol, w...

Embodiment 2

[0037] In this example, a biomass-derived porous carbon-confined iron single-atom metal composite was prepared in the same manner as in Example 1, with the only difference being that orange peel powder was used instead of grapefruit peel powder.

[0038] After testing, the mass of the composite material prepared in this example is ~0.2534g, the loading amount of monoatomic iron is 2.2wt%, and the monoatomic iron is highly dispersed in the porous carbon framework derived from orange peel, with high catalytic activity.

[0039] The same method as in Example 1 was used to test the catalytic performance of the composite material prepared in this example. After testing, the degradation rate of organic pollutant Golden Orange II and heavy metal pollutant hexavalent chromium reached 100%.

Embodiment 3

[0041] In this example, a biomass-derived porous carbon-confined iron single-atom metal composite was prepared in the same manner as in Example 1, with the only difference being that banana peel powder was used instead of pomelo peel powder.

[0042] According to tests, the mass of the composite material prepared in this example is ~0.2284g, the loading amount of monoatomic iron is 1.8wt%, and the monoatomic iron is highly dispersed in the porous carbon framework derived from banana peel, with high catalytic activity.

[0043] The same method as in Example 1 was used to test the catalytic performance of the composite material prepared in this example. After testing, the degradation rate of organic pollutant Golden Orange II and heavy metal pollutant hexavalent chromium reached 100%.

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Abstract

The invention provides a preparation method of a biomass-derived porous carbon confinement monatomic metal composite material, which comprises the following steps: mixing a biomass raw material dispersion liquid with phthalocyanine and metal phthalocyanine in a conjugate manner, and carrying out high-temperature pyrolysis in an inert gas atmosphere to obtain the biomass-derived porous carbon confinement monatomic metal composite material. Compared with the prior art, the method has the advantages that cheap biomass waste is used as a carbon and nitrogen source, phthalocyanine is used as a nitrogen source, metal phthalocyanine is used as a metal source, steric hindrance is provided for metal atoms by means of coordination of phthalocyanine/metal phthalocyanine, the method can be universally applied to preparation of various metal monatomic catalytic materials, and the metal monatomic is uniform in dispersion and excellent in performance.

Description

technical field [0001] The invention relates to a preparation method of a biomass-derived porous carbon-confined single-atom metal composite material, which belongs to the research field of single-atom catalytic technology and utilization of biomass waste resources. Background technique [0002] The metal in the single-atom catalytic material is dispersed on the carrier at the atomic level, with the smallest size, high atom utilization rate and excellent catalytic activity. It can be used in carbon monoxide oxidation, carbon dioxide reduction, oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) , Nitrogen Reduction Reaction (NRR), methane reforming hydrogen production and organic synthesis and other catalytic fields, which show comparable or better activity and selectivity than traditional homogeneous catalysts, and at the same time have the advantage of easy separation of heterogeneous catalysts. Emerging research hotspots in the field of heterogeneous cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/75B01J23/755B01J23/72B01J23/06B01J23/34
CPCB01J23/745B01J23/75B01J23/755B01J23/72B01J23/06B01J23/34
Inventor 姚运金胡欢欢胡红伟张阳洋郑宏达刘笑言唐英豪
Owner HEFEI UNIV OF TECH
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