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Tin monoatomic catalyst and preparation method thereof, and gas diffusion electrode

A gas diffusion electrode and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of low Faraday efficiency, achieve high Faraday efficiency, suppress hydrogen evolution reaction, and improve selectivity

Active Publication Date: 2019-09-13
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing electroreduction CO 2 The catalyst has the defect of low Faraday efficiency, thereby providing a tin single-atom catalyst with high Faraday efficiency, good stability, non-noble metal and its preparation method and gas diffusion electrode

Method used

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  • Tin monoatomic catalyst and preparation method thereof, and gas diffusion electrode
  • Tin monoatomic catalyst and preparation method thereof, and gas diffusion electrode
  • Tin monoatomic catalyst and preparation method thereof, and gas diffusion electrode

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a tin single-atom catalyst and a preparation method thereof, the preparation method comprising the following steps:

[0050] 1. Preparation of high-quality catalyst

[0051] (1) Preparation of Sn-MOF-74

[0052] Dissolve 2,5-dihydroxyterephthalic acid (0.2216g, 1.12mmol) and tin nitrate (1.077g, 3.70mmol) in an organic solvent (1:2:1 DMF, ethanol, H 2 (2, 75mL), stirred at 30°C for 30min to fully dissolve and mix the mixture; transfer the mixed solution to a 100mL reaction kettle, and heat at 200°C for 1h; base formamide, the washing temperature is 30°C, and the washing time is 2h, and then vacuum-dried, the vacuum degree is 0.08Pa, and the drying temperature is 20°C to obtain Sn-MOF-74.

[0053] (2) Preparation of crude tin catalyst

[0054] Take 0.5g of Sn-MOF-74, 5g of carbon powder, and 5g of ammonium nitrate, put them in a ball mill tank, and then perform ball milling on a ball mill with a ball milling speed of 50rpm / min and a ball milling...

Embodiment 2

[0060] This embodiment provides a tin single-atom catalyst and a preparation method thereof, the preparation method comprising the following steps:

[0061] 1. Preparation of high-quality catalyst

[0062] (1) Preparation of Sn-MOF-74

[0063] Dissolve 2,5-dihydroxyterephthalic acid (0.2216g, 1.12mmol) and tin nitrate (1.077g, 3.70mmol) in an organic solvent (2:1:1 dimethylformamide, ethanol, H 2 (2, 75mL), stirred at 20°C for 2h to fully dissolve and mix the mixture; transfer the mixed solution to a 100mL reaction kettle, and heat at 80°C for 48h; base formamide, the washing temperature is 10°C, the washing time is 4h, and then vacuum-dried, the vacuum degree is 0.02Pa, and the drying temperature is 30°C to obtain Sn-MOF-74.

[0064] (2) Preparation of crude tin catalyst

[0065] Take 0.5g of Sn-MOF-74, 0.5g of carbon powder, and 0.5g of ammonium nitrate, put them in a ball mill tank, and then perform ball milling on a ball mill with a ball milling speed of 150rpm / min and ...

Embodiment 3

[0071] This embodiment provides a tin single-atom catalyst and a preparation method thereof, the preparation method comprising the following steps:

[0072] 1. Preparation of high-quality catalyst

[0073] (1) Preparation of Sn-MOF-74

[0074] Dissolve 2,5-dihydroxyterephthalic acid (0.2216g, 1.12mmol) and tin nitrate (1.077g, 3.70mmol) in an organic solvent (1:1:1 DMF, ethanol, H 2 O, 75mL), stirred at 25°C for 1h to fully dissolve and mix the mixture; transfer the mixed solution to a 100mL reaction kettle, and heat at 150°C for 24h; base formamide, the washing temperature is 20°C, and the washing time is 3h, and then vacuum-dried, the vacuum degree is 0.05Pa, and the drying temperature is 25°C to obtain Sn-MOF-74.

[0075] (2) Preparation of crude tin catalyst

[0076] Take 0.5g of Sn-MOF-74, 3g of carbon powder, and 3g of ammonium nitrate, put them in a ball mill tank, and then perform ball milling on a ball mill with a ball milling speed of 100rpm / min and a ball milling...

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Abstract

The invention discloses a tin monoatomic catalyst and a preparation method thereof, and a gas diffusion electrode. The preparation method for the tin monoatomic catalyst comprises the following steps:synthesis of Sn-MOF-74 through a hydrothermal method; preparation of a tin catalyst through a high-temperature carbonization method; and removal of a plurality of impurity particles through acid treatment. The tin monoatomic catalyst prepared by using the method provided by the invention mainly has a Sn-N coordination structure, and can be applied to the gas diffusion electrode used for electroreduction of CO2. According to the invention, the Faraday efficiency of generation of CO by a CO2 electroreduction reaction is significantly improved, and the selectivity of a product is reinforced.

Description

technical field [0001] The invention relates to the field of metal single-atom catalysts, in particular to a tin single-atom catalyst, a preparation method thereof and a gas diffusion electrode. Background technique [0002] CO 2 Emission reduction is a major environmental issue that needs to be solved urgently all over the world. will CO 2 Transformation into useful chemicals can not only solve environmental problems, but also utilize its abundant carbon resources and have a profound impact on the energy structure of society. Current CO 2 The conversion methods mainly focus on biocatalytic methods, photocatalytic methods, high temperature and high pressure catalytic hydrogenation and electrocatalytic methods. Among them, the biological method has a long production cycle, and it is difficult to scale up to limit its application; the photocatalytic method mainly has unsatisfactory utilization of light energy, CO 2 Problems such as low conversion rate; and high temperatur...

Claims

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Application Information

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IPC IPC(8): B01J23/14C25B1/00C25B11/06C25B11/12
CPCB01J23/14C25B1/00C25B11/051C25B11/075B01J35/33
Inventor 杜兆龙徐桂芝宋鹏翔毛庆黄延强
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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