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Fe monatomic loaded electrochemical catalyst as well as preparation method and application thereof

A catalyst and electrochemical technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high catalyst preparation costs, and achieve fine regulation, high catalytic activity and durability, The effect of simple preparation method

Inactive Publication Date: 2021-11-26
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, RμL is a noble metal, and the cost of catalyst preparation is relatively high

Method used

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  • Fe monatomic loaded electrochemical catalyst as well as preparation method and application thereof
  • Fe monatomic loaded electrochemical catalyst as well as preparation method and application thereof
  • Fe monatomic loaded electrochemical catalyst as well as preparation method and application thereof

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preparation example Construction

[0043] Fe 1 -The preparation method of N-C, comprises the following steps:

[0044] (1) Add 2-methylimidazole to the mixed solution of methanol and dimethylformamide with a volume ratio of 1:0.9-1.1 to make the first solution; the concentration of 2-methylimidazole in the first solution is 10 -20mmol / L;

[0045] (2) Add zinc nitrate hexahydrate and iron acetylacetonate with a volume ratio of 55-65:1 to a mixed solution of tetrahydrofuran and methanol with a volume ratio of 1:1.8-2.2 to prepare a second solution; in the second solution, six The concentration of zinc nitrate hydrate is 3-10mmol / L;

[0046] (3) Evenly mix the second solution with a volume ratio of 1:2.8-3.2 with the first solution, ultrasonically oscillate for 10-20 minutes, and use magnetic stirring for 0.5-1.5 hours to obtain a suspension, and then transfer the suspension to In a high-pressure reactor, react at 110-130°C for 4-8 hours to obtain a red precipitate;

[0047] (4) Wash the red precipitate obtain...

Embodiment 1

[0054] Fe 1 -The preparation method of N-C, comprises the following steps:

[0055] (1) Weigh 1.32g of 2-methylimidazole, put it into a 50ml beaker, add 5ml of methanol solution and 5ml of dimethylformamide mixed solution, and sonicate for 10min to form the first solution;

[0056] (2) Weigh 1.2g of zinc nitrate hexahydrate, put it into a 50ml beaker, add 20ml of methanol solution and 10ml of tetrahydrofuran mixed solution, sonicate for 10min, after fully dissolved, add 20mg of iron acetylacetonate to form the second solution;

[0057] (3) Pour all the second solution into the first solution, after ultrasonic vibration for 10 minutes, place it in a magnetic stirrer and stir for 1 hour, then transfer the suspension to a high-pressure reactor, react at 120°C for 4 hours, and then After cooling to room temperature, a red precipitate was obtained;

[0058] (4) Wash the red precipitate obtained in step (3) with methanol. After washing, centrifuge at 3000r / min for 30min to separat...

Embodiment 2

[0065] Fe 1 -The preparation method of N-C, comprises the following steps:

[0066] (1) Weigh 1.32g of 2-methylimidazole, put it into a 50ml beaker, add 5ml of methanol solution and 5ml of dimethylformamide mixed solution, and sonicate for 10min to form the first solution;

[0067] (2) Weigh 1.2g of zinc nitrate hexahydrate, put it into a 50ml beaker, add 20ml of methanol solution and 10ml of tetrahydrofuran mixed solution, sonicate for 10min, after fully dissolved, add 20mg of iron acetylacetonate to form the second solution;

[0068] (3) Pour all the second solution into the first solution, after ultrasonic vibration for 10 minutes, place it in a magnetic stirrer and stir for 1 hour, then transfer the suspension to a high-pressure reactor, react at 120°C for 4 hours, and then After cooling to room temperature, a red precipitate was obtained;

[0069] (4) Wash the red precipitate obtained in step (3) with methanol. After washing, centrifuge at 3000r / min for 30min to separat...

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Abstract

The invention relates to the field of electrochemical catalysts, and discloses a Fe monatomic loaded electrochemical catalyst as well as a preparation method and application thereof. The catalyst disclosed by the invention is Fe1-N-C and comprises an imidazole structure unit formed by nitrogen-doped carbon and a doped nitrogen atom anchored Fe single atom; the catalyst is a regular dodecahedron structure monomer composed of a plurality of imidazole structure units, nitrogen atoms on the surface of the regular dodecahedron structure monomer anchor Fe single atoms, each Fe atom is combined with four N atoms, the catalyst is prepared through a hydrothermal method, and the catalyst is applied to electrocatalytic reduction of nitrate radicals into ammonia. The Fe1-N-C prepared by the method has high catalytic activity and durability in nitrate ion electrochemical reduction, has high selectivity, and is beneficial to fine regulation and control of the nitrate reduction reaction rate; the preparation method is simple and can adapt to production; nitrate ions in a water body can be reduced, and prevention and control of water body pollution are facilitated.

Description

technical field [0001] The invention relates to the field of electrochemical catalysts, in particular to an electrochemical catalyst supporting Fe single atoms, a preparation method and application thereof. Background technique [0002] The fundamental motivation for converting nitrate to ammonia is to develop a sustainable pathway that enables nitrogen nutrients / fuels to be recovered from wastewater for clean water production. Thus, one can expect nitrogen from wastewater and soil to cease to be an environmental burden and instead serve as a resource for fertilizer recycling. This process is similar to the reduction of nitrate nitrogen to ammonium nitrogen by microorganisms, and plays an important role in the sustainability of terrestrial and marine nitrogen cycles. In principle, at basic conductivity, nitrates are more easily reduced to ammonia than nitrogen with a favorable thermodynamic potential (0.69 V vs. RHE), while the electrochemical nitrate reduction reaction (Ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/461C02F1/467C02F1/70C25B1/27C25B1/50C25B11/091C02F101/16B01J35/00
CPCB01J27/24C02F1/4676C02F1/46109C25B1/27C25B1/50C25B11/091C02F2001/46142C02F2101/163B01J35/33B01J35/40
Inventor 叶伟徐梦秋
Owner HANGZHOU NORMAL UNIVERSITY