Preparation method and application of NiFe-LDH catalyst for reducing nitrate into ammonia

A catalyst and nitrate technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of not improving the selectivity of nitrate into ammonia, low catalytic performance, etc., and achieve product form Good appearance, high specific surface area, mild condition effect

Pending Publication Date: 2022-01-14
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the catalyst used in the battery system does not improve the selectivity of nitrate into ammonia, and the catalytic performance is still low

Method used

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  • Preparation method and application of NiFe-LDH catalyst for reducing nitrate into ammonia
  • Preparation method and application of NiFe-LDH catalyst for reducing nitrate into ammonia
  • Preparation method and application of NiFe-LDH catalyst for reducing nitrate into ammonia

Examples

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preparation example Construction

[0032] 1. Preparation of NiFe-LDH catalyst

[0033]Dissolve nickel nitrate hexahydrate and urea in the mixed solution of water and triethylene glycol, stir for 8 to 10 minutes, then add ferric trichloride hydrate, and continue stirring for 30 to 40 minutes, wherein nickel nitrate hexahydrate and trichloride hydrate The molar ratio of iron to nickel and iron is 1:0.1~1; then hydrothermally react at 110~130°C for 20~26h; after the reaction, wash and dry sequentially to obtain NiFe-LDH catalyst.

[0034] 2. Reactivity test of NiFe-LDH catalyst

[0035] Add 4mg of NiFe-LDH catalyst to a mixed solution of 750uL deionized water, 200uL isopropanol and 50uL naphthol to make a catalyst solution, and drop 30uL onto 1cm*1cm carbon paper as the cathode. Using a three-electrode system, the carbon paper was clamped by the electrode holder as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and the platinum mesh was used as the counter electro...

Embodiment 1

[0041] 1. Preparation of NiFe-LDH catalyst

[0042] Dissolve nickel nitrate hexahydrate and urea in a mixed solution of 50 mL deionized water and triethylene glycol, stir for 10 minutes, then add ferric chloride hydrate, and continue stirring for 30 minutes, wherein nickel nitrate hexahydrate and ferric chloride hydrate The molar ratio of nickel and iron is 1:0.5; followed by hydrothermal reaction at 120°C for 24 hours; after the reaction, washed with deionized water and absolute ethanol, dried in a vacuum oven to obtain NiFe-LDH catalyst .

[0043] 2. Reactivity test of NiFe-LDH catalyst

[0044] Add 4mg of NiFe-LDH catalyst to a mixed solution of 750uL deionized water, 200uL isopropanol and 50uL naphthol to make a catalyst solution, and drop 30uL onto 1cm*1cm carbon paper as the cathode. Using a three-electrode system, the carbon paper was clamped by the electrode holder as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and...

Embodiment 2

[0046] 1. Preparation of NiFe-LDH catalyst

[0047] Dissolve nickel nitrate hexahydrate and urea in a mixed solution of 50 mL deionized water and triethylene glycol, stir for 10 minutes, then add ferric chloride hydrate, and continue stirring for 30 minutes, wherein nickel nitrate hexahydrate and ferric chloride hydrate The molar ratio of nickel to iron is 1:0.4; followed by hydrothermal reaction at 120°C for 24 hours; after the reaction, washed with deionized water and absolute ethanol, dried in a vacuum oven to obtain NiFe-LDH catalyst .

[0048] 2. Reactivity test of NiFe-LDH catalyst

[0049] Add 4mg of NiFe-LDH catalyst to a mixed solution of 750uL deionized water, 200uL isopropanol and 50uL naphthol to make a catalyst solution, and drop 30uL onto 1cm*1cm carbon paper as the cathode. Using a three-electrode system, the carbon paper was clamped by the electrode holder as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and ...

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Abstract

The invention relates to the technical field of catalysts, and discloses a preparation method and application of a NiFe-LDH catalyst for reducing nitrate to ammonia, wherein the preparation method comprises the following steps: dissolving nickel nitrate hexahydrate and alkali in a mixed solution of water and an organic solvent, stirring, adding ferric trichloride hydrate, continuously stirring, and carrying out a hydrothermal reaction; and after the reaction is finished, sequentially washing and drying to obtain the NiFe-LDH catalyst. The NiFe-LDH catalyst comprises a Ni(OH)2 nanosheet loaded with nano iron; the Ni(OH)2 nanosheet loaded with the nano iron forms a nano-layer structure. According to the invention, synergistic active sites composed of transition metal and oxyphilic metal hydroxides are utilized to improve the reaction efficiency of reducing nitrate into ammonia, and the reduction activity and the reaction selectivity are improved; and the NiFe-LDH catalyst can also be used as a bifunctional catalyst for a cathode and an anode at the same time.

Description

technical field [0001] The invention relates to the technical field of catalysts, more specifically, the invention relates to a preparation method and application of a NiFe-LDH catalyst used for reducing nitrate to ammonia. Background technique [0002] As one of the most common industrial chemicals, ammonia not only plays an important role in agriculture, textile industry, pharmaceutical industry, etc., but also can be used by humans as a new generation of high energy density energy carrier. At present, traditional industrial ammonia is synthesized through the Haber-Bosch (Haber-Bosch) process under high temperature and high pressure conditions. The separation, purification and preparation of raw gas during the production process is accompanied by a large amount of greenhouse gas emissions and energy consumption. Recently, the artificial nitrogen fixation model using water as a hydrogen source has attracted much attention, but breaking the high-energy nitrogen-nitrogen trip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/10C25B1/27C25B1/04C25B11/054C25B11/067C25B11/091
CPCB01J23/755B01J37/10B01J35/0033C25B1/27C25B1/04C25B11/054C25B11/067C25B11/091Y02E60/36
Inventor 叶伟徐梦秋
Owner HANGZHOU NORMAL UNIVERSITY
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