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Metal bismuth nanoparticle composite material and preparation method and application thereof

A composite material, bismuth particle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult to maintain catalytic stability, weak force, etc., to ensure long-term stability , Well-developed pores and high activity

Active Publication Date: 2021-07-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the weak force between the metal particles and the graphene support, it is difficult to maintain long-term catalytic stability
It can be seen that although a class of bismuth nanoparticle-based composite catalysts known in the prior art has achieved good formic acid Faradaic efficiency and high catalyst activity, the stability of the catalyst also restricts the large-scale industrialization of this type of catalyst. , constraints to commercialization

Method used

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  • Metal bismuth nanoparticle composite material and preparation method and application thereof
  • Metal bismuth nanoparticle composite material and preparation method and application thereof
  • Metal bismuth nanoparticle composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Dissolve 10 mg of tetraaminophenylporphyrin in 20 mL of chloroform and 20 mL of dimethylformamide mixed solvent, ultrasonic for 1 hour, then add Ketjen Black (model ECP-600JD, pore size approx. 10nm nanometer, the specific surface area is 1400m 2 / g) 60 mg, continue to sonicate for 1 hour, centrifuge to collect the solid product after impregnation and adsorption for 12 hours, wash with ethanol twice, and then vacuum-dry at 60°C for 6 hours. The dried samples were taken out and baked in a tube furnace with two temperature zones at 100°C for 1 hour. Take 60 mg of baked porous carbon and disperse it in 20 mL of dimethylformamide solution with 1 mmol of bismuth nitrate dissolved in it, ultrasonically for 1 hour and then soak for 12 hours, add 10 mL of dimethylformamide solution with 1 mmol of sodium borohydride dropwise into the above solution The formamide solution was stirred for 15 minutes at the same time, centrifuged and washed with ethanol for 3 times, and vacuum-dri...

Embodiment 2

[0054] Prepared according to the same method as in Example 1, the difference is that the tetraaminophenylporphyrin quality added in Example 1 is changed from 10 mg to 5 mg, and as a result, the size of the metal bismuth nanoparticles loaded on the porous carbon has no significant change, Then the composite catalyst obtained is tested in 0.5M potassium bicarbonate solution, and the current density is 43.5 mA / cm when the potential is -1.0 volts 2 , the faradaic efficiency of formic acid is 86.2%. Under the condition that the constant potential is -0.9 volts and the Faraday efficiency is maintained at least 80%, the stability test lasts for 15 hours.

Embodiment 3

[0056] Prepared according to the same method as in Example 1, the difference is that the quality of tetraaminophenylporphyrin added in Example 1 is changed from 10 mg to 15 mg, and as a result, the size of the metal bismuth nanoparticles loaded on the porous carbon has no significant change, Then the composite catalyst obtained is tested in 0.5M potassium bicarbonate solution, and the current density is 40.6 mA / cm when the potential is -1.0 volts 2 , the faradaic efficiency of formic acid is 88.4%. Under the condition that the constant potential is -0.9 volts and the Faraday efficiency is maintained at least 80%, the stability test lasts for 14 hours.

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Abstract

The invention relates to a supported metal bismuth particle composite material which is characterized in that metal bismuth particles are supported on a porous carbon carrier through a coupling agent with amino groups, and the particle size of the metal bismuth particles is 5-30nm. The preparation method comprises the following steps: loading tetraaminophenyl porphyrin molecules on porous carbon through simple two-step impregnation adsorption to form a modified porous carbon composite material, and then carrying out second-step impregnation adsorption on the modified porous carbon composite material and bismuth metal salt under a sodium borohydride reduction condition. Benefited from the confinement effect of porous carbon and the special stabilizing effect of the molecular coupling agent, the bismuth metal small nanoparticles are fixed on the porous carbon carrier in a strong binding form, the loading capacity is high, and the activity is high, so that the molecular coupling agent plays a role in enhancing the interaction between the bismuth metal nano particles and the carrier, and the self structure is not changed under the reduction condition. The supported metal bismuth particle composite material is used for preparing formic acid by carbon dioxide epoxy, has excellent catalytic activity and stability, and has obvious industrial advantages.

Description

technical field [0001] The invention belongs to the field of inorganic composite material catalysts, and in particular relates to a metal bismuth nano particle composite material and its preparation method and application. Background technique [0002] In order to promote the development of the current human society, the massive exploitation and consumption of fossil fuels has caused the concentration of carbon dioxide in the atmosphere to increase day by day, and the increasingly close human activities have caused the concentration of carbon dioxide to exceed the safe upper limit (350ppm), causing serious climate and environmental problems, especially the global greenhouse effect. Recycling and converting carbon dioxide in the atmosphere into useful chemical raw materials or small molecule fuels is one of the effective ways to alleviate environmental problems and energy crises at the same time. Therefore, electrocatalytic carbon dioxide reduction to prepare high value-added...

Claims

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Application Information

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IPC IPC(8): C25B11/075C25B3/26C25B3/07B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00
Inventor 胡劲松张礼兵唐堂
Owner INST OF CHEM CHINESE ACAD OF SCI
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