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

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

Inactive Publication Date: 2014-11-05
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 a 50ml mixed solution; weigh 0.4938g of K 3 [Fe(CN) 6 ] added to the above mixed solution. Take by weighing 3.7537g urea and be dissolved in the 50ml aqueous methanol solution (V CH3OH / VH2O = 1:3). Transfer the prepared mixed salt solution and alcohol aqueous solution to a polytetrafluoroethylene crystallization reactor, seal it and heat it to 100°C, react for 6 hours, cool it down to room temperature and let it stand for 12 hours, take out the mixture and centrifuge it with deionized water Washed 4 times and dried in air atmosphere for 24h to obtain intercalated LDHs. Spread 0.5g of intercalated LDHs evenly in a small porcelain boat, place the small porcelain boat in the middle of the quartz tube of the tube-type atmosphere furnace, and inject N with a flow rate of 300ml / min. 2 , starting from 30°C, increasing the temperature to 900°C at a rate of 5°C / min, and then passing N a...

Embodiment 2

[0027] 1.8485g of MgSO 4 ·7H 2 O and 3.3308g of Al 2 (SO 4 ) 3 18H 2 O is prepared into a 50ml mixed solution; weigh 0.2469g of K 3 [Fe(CN) 6 ] added to the above mixed solution. Take by weighing 2.2522g urea and be dissolved in the 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 it and heat it to 120°C, react for 4 hours, cool it down to room temperature and let it stand for 24 hours, take out the mixture and centrifuge it with deionized water Washed 4 times, dried under air atmosphere for 36h to obtain intercalated LDHs. Spread 0.5g of intercalated LDHs evenly in a small porcelain boat, place the small porcelain boat in the middle of the quartz tube of the tube-type atmosphere furnace, and inject N with a flow rate of 400ml / min. 2 , starting from 30°C, increasing the temperature to 800°C at a rate of 3°C / min, and then passing N ...

Embodiment 3

[0030] 4.066g of MgCl 2 ·6H 2 O and 4.2632g of AlCl 3 ·6H 2 O is prepared into a 50ml mixed solution; weigh 0.8231g of K 3 [Fe(CN) 6 ] added to the above mixed solution. Take by weighing 4.5045g urea and be dissolved in the 50ml aqueous methanol solution (V CH3OH / V H2O = 1:5). Transfer the prepared mixed salt solution and alcohol aqueous solution to a polytetrafluoroethylene crystallization reactor, seal it and heat it to 140°C, react for 5 hours, cool it down to room temperature and let it stand for 18 hours, take out the mixture and centrifuge it with deionized water Washed 4 times and dried under air atmosphere for 32h to obtain intercalated LDHs. Spread 0.5g of intercalated LDHs evenly in a small porcelain boat, place the small porcelain boat in the middle of the quartz tube of the tube-type atmosphere furnace, and inject N with a flow rate of 500ml / min. 2 , starting from 30°C, increasing the temperature to 1000°C at a rate of 2°C / min, and then passing N at a fl...

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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, in particular to a preparation method of a highly dispersed and supported nanometer metal Fe-based catalyst. The catalyst is used for the degradation of organic dye methylene blue. Background technique [0002] Fenton's reagent is composed of ferrous ion (Fe 2+ ) and hydrogen peroxide (H 2 o 2 ) system composed of. It can generate strong oxidizing hydroxyl radicals, which can rapidly oxidize refractory organic matter. Fenton reagent advanced oxidation technology has been widely concerned by scholars at home and abroad. However, homogeneous Fenton catalysts have many disadvantages, such as Fe 2+ The formation of iron sludge in the solution causes secondary pollution, the color of the treated wastewater increases, it is not easy to recycle, and the iron content is seriously lost. Therefore, how does the Fe in the Fenton reaction 2+ Solidification, preparation of heterogeneous cat...

Claims

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Application Information

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Patent Type & Authority Patents(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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