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Preparation method and applications for metal monoatomic material

A metal atom and atom technology, which is applied in the field of preparation of metal single-atom materials, can solve the problems of inability to maintain metal-non-metal coordination active structure and structural instability, and achieve the advantages of simple preparation route, suppression of damage and improvement of material properties. Effect

Inactive Publication Date: 2020-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact, whether it is a porphyrin compound or a phthalocyanine compound, it needs to be combined with a carbon material and pyrolyzed to show good catalytic activity, and the general preferred pyrolysis temperature is 800 ° C and above, and in this At this temperature, the structure of the metal compound becomes unstable, it is very easy to decompose and form nanoparticles, and cannot maintain the active structure of metal-nonmetal coordination, so that the simple compound and pyrolysis method cannot completely Make full use of the excellent properties of this material

Method used

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  • Preparation method and applications for metal monoatomic material
  • Preparation method and applications for metal monoatomic material
  • Preparation method and applications for metal monoatomic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Fe monoatomic materials: Weigh porphyrin iron and conductive carbon black with a mass ratio of 1:2, dissolve them in an appropriate volume of N,N-dimethylformamide (DMF), sonicate and stir for 24 hours to make them completely dispersed . Then put it into a blast drying box for solvent evaporation. Take the completely dried sample and place it in an agate mortar, add the protective agent tetraethyl silicate and the additive acetic acid in a volume ratio of 1:1, and then grind the solid-liquid mixture until it is completely dry. The powder was placed in a tube furnace, and the temperature was raised to 800°C in an argon atmosphere for high-temperature carbonization for 2h at a heating rate of 2°C / min. Then the temperature was naturally cooled to room temperature, and the black fluffy powder was obtained by taking out.

[0036] Add the black powder to an appropriate volume of a 1:1 mixed acid etching solution of hydrochloric acid and hydrofluoric acid for sti...

Embodiment 2

[0044] Preparation of Fe monoatomic material: Weigh porphyrin iron and glucose with a mass ratio of 1:5, dissolve them in an appropriate volume of N,N-dimethylformamide (DMF), sonicate and stir for 24 hours to completely disperse them. Then put it into a blast drying box for solvent evaporation. Take the completely dried sample and place it in an agate mortar, add the protective agent tetraethyl silicate and the additive hydrochloric acid in a volume ratio of 1:1, and then grind the solid-liquid mixture until it is completely dry. The powder was placed in a tube furnace, and the temperature was raised to 800°C in an argon atmosphere for high-temperature carbonization for 2h at a heating rate of 2°C / min. Then the temperature was naturally cooled to room temperature, and the black fluffy powder was obtained by taking out.

[0045] Add the black powder to an appropriate volume of a 1:1 mixed acid etching solution of nitric acid and hydrofluoric acid for stirring and etching for 12 ...

Embodiment 3

[0047] Preparation of Fe monoatomic material: Weigh iron phthalocyanine and carbon nanotubes with a mass ratio of 1:3, dissolve them in an appropriate volume of N,N-dimethylformamide (DMF), and stir for 24 hours to make them completely dispersed. . Then put it into a blast drying box for solvent evaporation. Take the completely dried sample and place it in an agate mortar, add the protective agent tetraethyl silicate and the additive nitric acid in a volume ratio of 1:1, and then grind the solid-liquid mixture until it is completely dry. The powder was placed in a tube furnace, and the temperature was raised to 800°C in an argon atmosphere for high-temperature carbonization for 2h at a heating rate of 2°C / min. Then the temperature was naturally cooled to room temperature, and the black fluffy powder was obtained by taking out.

[0048] Add the black powder to the appropriate volume of a 1:1 mixed acid etching solution of sulfuric acid and hydrofluoric acid for stirring and etch...

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Abstract

The invention provides a preparation method and applications for a metal monoatomic material. The method selects a metallic compound containing a metal-nonmetal coordination structure; destruction toa catalytically active structure can be effectively prevented through a processing mode of performing pyrolysis after the metallic compound, a protective agent and any carbon substrates are simply mixed; and therefore, the metal monoatomic material can be efficiently prepared and shows good performance. The technical route of the method is simple and effective and has universality and good application prospects.

Description

Technical field [0001] The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method and application of a metal monoatomic material. Background technique [0002] Since 2011, academician Zhang Tao of Dalian Institute of Chemical Physics, Chinese Academy of Sciences proposed the idea of ​​using single metal atoms for catalysis (Qiao, B., et al. (2011). Nat Chem 3(8):634-641.), Atoms have received extensive attention from practitioners in the catalysis industry because of their ultra-high catalytic activity and extremely high atom utilization. After recent years of development, metal single-atom catalysts have quickly become an emerging direction and research hotspot in the catalysis industry. At present, the methods for preparing metal single-atom catalysts mainly include immersion method, atomic layer deposition method, and photoelectrochemical metal particle reduction method. However, these methods are only applicable to on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/72C25B11/06
CPCB01J23/745B01J23/72C25B11/075B01J35/399B01J35/393B01J35/23B01J35/33
Inventor 刘敏林翌阳傅俊伟
Owner CENT SOUTH UNIV
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