Nano-composite of carbon-coated iron and iron carbide, and preparation method for same

A nano-composite material and composite material technology are applied in the field of carbon-coated iron and iron carbide nano-composite materials and their preparation, which can solve the problems of poor coating, limited application of materials, and only remaining iron mass fraction, and achieve environmental friendliness. , broad application prospects, the effect of reducing the dosage

Active Publication Date: 2020-05-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, carbon-coated iron nanoparticles usually prepared by high-temperature pyrolysis have the problem of poor coating, such as Wu et al. The prepared B, N co-doped carbon-coated iron nanoparticles were pickled with hydrochloric acid, and the mass fraction of iron was only 3.9%
[0004] To sum up, how to prepare iron and iron carbide nanoparticles tightly coated with carbon layers efficiently and in batches is still one of the difficulties in this field, which also greatly limits the industrial application of such materials.

Method used

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  • Nano-composite of carbon-coated iron and iron carbide, and preparation method for same
  • Nano-composite of carbon-coated iron and iron carbide, and preparation method for same
  • Nano-composite of carbon-coated iron and iron carbide, and preparation method for same

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preparation example Construction

[0038] The preparation method of the present invention may also include step S5, wherein the product obtained in step S4 is purified in an acidic solution to remove incompletely coated iron and iron carbide cores.

[0039] Wherein the acidic solution used in step S5 is hydrochloric acid, sulfuric acid or hydrofluoric acid aqueous solution, and the concentration range is 0.1-5 mol / L.

Embodiment 1

[0041] Weigh 10mmol Fe(OH) 3 10mmol of ethylenediaminetetraacetic acid was added to 100mL of deionized water, stirred at 80°C to obtain a homogeneous solution, 30mmol of dicyandiamide was added and continued to heat and evaporate to dryness, and the solid was ground to obtain the first precursor.

[0042] Put the obtained first precursor in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, pass nitrogen gas, the flow rate is 100mL / min, and raise the temperature to 700°C at a rate of 5°C / min, and keep the temperature for 3 hours Stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a carbon-coated composite material.

[0043] The obtained carbon-coated composite material and dicyandiamide were added into 40 mL of deionized water at a mass ratio of 1:1, stirred at 80°C and evaporated to dryness, and the solid was ground to obtain a second precursor.

[0044] Put the second precursor in the porcelai...

Embodiment 2

[0047] Weigh 10mmol Fe(OH) 3 10mmol of ethylenediaminetetraacetic acid was added to 100mL of deionized water, stirred at 70°C to obtain a homogeneous solution, 30mmol of dicyandiamide was added and evaporated to dryness, and the solid was ground to obtain a precursor.

[0048] Put the obtained precursor in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, pass nitrogen gas, flow rate 100mL / min, and raise the temperature to 800°C at a rate of 5°C / min, stop heating after 3 hours of constant temperature , cooled to room temperature under a nitrogen atmosphere to obtain a carbon-coated composite material.

[0049] The obtained carbon-coated composite material and dicyandiamide were added into 60 mL of deionized water at a mass ratio of 1:1, stirred at 80°C and evaporated to dryness, and the solid was ground to obtain a second precursor.

[0050] Put the second precursor in the porcelain boat, then place the porcelain boat in t...

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Abstract

The invention provides a preparation method for a nano-composite of carbon-coated iron and iron carbide. The method comprises the following steps: (S1) mixing one type or more than one types among citric acid coordinated iron or EDTA coordinated iron with one type or more than one types among cyanoguanidine and melamine to form a first precursor; (S2) treating the first precursor with first high-temperature pyrolysis under an inert atmosphere or a reducing atmosphere to obtain a primary composite material; (S3) mixing the primary composite material with one type or more than one types among cyanoguanidine, melamine and hexamine to form a second precursor; and (S4) treating the second precursor with secondary high-temperature pyrolysis under the inert atmosphere or the reducing atmosphere,wherein the temperature of the first high-temperature pyrolysis is higher than the temperature of the secondary high-temperature pyrolysis. In the method provided by the invention, through coordination effects of common and cheap organic acids and assistant effects of cyanamide compounds, a use dosage of low-efficiency cyanamide compounds is effectively reduced, and generation of CNT coated metalby-products is avoided. Through two low-temperature pyrolysis courses, defects of the composite are effectively repaired.

Description

technical field [0001] The invention belongs to the field of preparation and application of carbon-coated metal composite materials, and in particular relates to a carbon-coated iron and iron carbide nanocomposite material and a preparation method thereof. Background technique [0002] Iron and iron carbide nanoparticles have attracted much attention due to their excellent optical, electrical, and magnetic properties. However, metal iron nanoparticles have poor stability and are easily oxidized or even burned in the air; in addition, as catalysts, they are prone to agglomeration or loss of active phase, which greatly limits the application prospects of such materials. At the same time, carbon nanomaterials have the advantages of acid and alkali corrosion resistance and stable chemical properties. In addition, carbon nanomaterials also exhibit excellent catalytic performance in some reactions. Nano-carbon coated metal composites are one of the research hotspots in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30B22F1/02C01B32/914B82Y30/00B82Y40/00
CPCB22F9/30C01B32/914B82Y30/00B82Y40/00B22F1/054B22F1/16
Inventor 吴耿煌荣峻峰达志坚宗明生于鹏谢婧新林伟国纪洪波
Owner CHINA PETROLEUM & CHEM CORP
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