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Preparation method of high-dispersion supported nano metal Fe-based catalyst

A nano-metal, high-dispersion technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing catalytic performance and easy agglomeration of metal particles. Achieve the effects of inhibiting aggregation, improving chemical stability, and good catalytic oxidation performance

Inactive Publication Date: 2013-07-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation of such catalytic materials, the metal particles formed after the reduction of the metal species located in the laminates or interlayers are easy to agglomerate due to the collapse of the laminates, thereby reducing the catalytic performance.

Method used

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  • Preparation method of high-dispersion supported nano metal Fe-based catalyst
  • Preparation method of high-dispersion supported nano metal Fe-based catalyst
  • Preparation method of high-dispersion supported nano metal Fe-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 3.8461g of Mg(NO 3 ) 2 ·6H 2 O and 5.6270g of Al(NO 3 ) 3 ·9H 2 O is prepared into 50ml mixed solution; weigh 0.4938g of K 3 [Fe(CN) 6 ] Add to the above mixed solution. Weigh 3.7537g urea and dissolve it in 50ml methanol aqueous solution (V CH3OH / V H2O = 1:3). Transfer the prepared mixed salt solution and alcohol aqueous solution to a polytetrafluoroethylene crystallization reactor, seal and heat to 100°C, react for 6 hours and then cool to room temperature and let stand for 12 hours, take out the mixture and centrifuge, and centrifuge with deionized water Wash 4 times, dry for 24h in air atmosphere, and obtain intercalated LDHs. Spread 0.5g of intercalated LDHs evenly in a small porcelain boat, and place the small porcelain boat in the middle of the quartz tube of the tubular atmosphere furnace, and introduce N with a flow rate of 300ml / min 2 , Starting from 30°C, increasing to 900°C at a heating rate of 5°C / min, and then introducing N with a flow rate of 600ml / min ...

Embodiment 2

[0027] Mix 1.8485g of MgSO 4 ·7H 2 O and 3.3308g Al 2 (SO 4 ) 3 ·18H 2 O is made into 50ml mixed solution; Weigh 0.2469g of K 3 [Fe(CN) 6 ] Add to the above mixed solution. Weigh 2.2522g urea and dissolve it in 50ml ethanol aqueous solution (V C2H5OH / V H2O = 1:4). Transfer the prepared mixed salt solution and alcohol aqueous solution to a polytetrafluoroethylene crystallization reactor, seal and heat to 120°C, react for 4 hours and then cool to room temperature and let stand for 24 hours, take out the mixture and centrifuge, and centrifuge with deionized water It was washed 4 times and dried for 36 hours under air atmosphere to obtain intercalated LDHs. Spread 0.5g of intercalated LDHs evenly in a small porcelain boat, and place the small porcelain boat in the middle of the quartz tube of the tubular atmosphere furnace, and pass N with a flow rate of 400ml / min. 2 , Starting from 30°C, increasing to 800°C at a heating rate of 3°C / min, and then introducing N with a flow rate...

Embodiment 3

[0030] Add 4.066g of MgCl 2 ·6H 2 O and 4.2632g of AlCl 3 ·6H 2 O is made into 50ml mixed solution; Weigh 0.8231g of K 3 [Fe(CN) 6 ] Add to the above mixed solution. Weigh 4.5045g urea and dissolve it in 50ml methanol aqueous solution (V CH3OH / V H2O = 1:5). Transfer the prepared mixed salt solution and alcohol aqueous solution to a polytetrafluoroethylene crystallization reactor, seal and heat to 140℃, react for 5 hours and then cool to room temperature and let stand for 18 hours, take out the mixture and centrifuge, and centrifuge with deionized water It was washed 4 times and dried in air for 32 hours to obtain intercalated LDHs. Spread 0.5g intercalated LDHs evenly in a small porcelain boat, and place the small porcelain boat in the middle of the quartz tube of the tubular atmosphere furnace, and pass N with a flow rate of 500ml / min. 2 , Starting from 30°C, increasing to 1000°C at a heating rate of 2°C / min, and then introducing N with a flow rate of 400ml / min 2 And H 2 M...

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Abstract

The invention relates to a preparation method of a high-dispersion supported nano metal Fe-based catalyst and belongs to the technical field of Fe-based catalysts. According to the preparation method, an Mg-LDHs precursor containing an iron coordination ion intercalation is prepared by virtue of an intercalation assembly method; and then, with methane as an air source, iron nano particles are further reduced and multiwalled carbon nano tubes grow out simultaneously in one step by virtue of a chemical vapor deposition method, and thus the magnalium composite metal oxide supported high-dispersion iron-based catalyst containing the iron nano particles coated with the multiwalled carbon nano tubes. The high-dispersion supported nano metal Fe-based catalyst is structurally characterized in that the iron nano particles are supported on the surface of the magnalium composite metal oxide after being coated with the multiwalled carbon nano tubes. By utilizing the preparation method, the chemical stability of active nano metal particles is improved, the gather of the active nano particles is restrained, and the structure stability of the catalyst is improved due to the strong interaction between the multiwalled carbon nano tubes and the iron nano particles. When used as a fenton-like catalyst, the high-dispersion supported nano metal Fe-based catalyst shows good catalytic oxidation performance to organic dyestuff methylene blue, the degradation rate reaches 95.0-100%, and the high-dispersion supported nano metal Fe-based catalyst has potential practical application value.

Description

Technical field [0001] The invention belongs to the technical field of Fe-based catalysts, and particularly relates to a method for preparing a highly dispersed supported nano-metal Fe-based catalyst. The catalyst is used for the degradation of organic dye methylene blue. Background technique [0002] Fenton reagent is composed of ferrous ion (Fe 2+ ) And hydrogen peroxide (H 2 O 2 ) System. It can generate strong oxidizing hydroxyl radicals, which can quickly oxidize difficult-to-degrade organics. Fenton's reagent advanced oxidation technology has been widely concerned by scholars at home and abroad. However, the homogeneous Fenton catalyst has many disadvantages, such as Fe 2+ The formation of iron sludge in the solution causes secondary pollution, the chromaticity of the wastewater after treatment increases, it is not easy to recover, and the iron content loss is serious. Therefore, how to convert Fe in Fenton reaction 2+ Curing and preparing heterogeneous catalysts are one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745A62D3/38A62D101/28
Inventor 李峰房美孙婷婷范国利
Owner BEIJING UNIV OF CHEM TECH
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