Porous carbon-loaded monatomic metal nitrogen coordination composite material and preparation method thereof

A composite material, porous carbon technology, applied in the preparation/purification of carbon, nitrogen-metal/silicon/boron binary compounds, nitrogen compounds, etc., can solve the problem of poor stability of single-atom materials, catalytic stability to be improved, The problem of high single-atom surface energy is suitable for large-scale production, easy to mass production, and good mechanical properties.

Active Publication Date: 2020-09-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still challenges in the controllable preparation of single-atom catalysts: 1. Due to the high surface energy of single atoms and thermodynamic instability, active single atoms tend to move and agglomerate to form clusters or nanostructures during the preparation process or subs

Method used

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  • Porous carbon-loaded monatomic metal nitrogen coordination composite material and preparation method thereof
  • Porous carbon-loaded monatomic metal nitrogen coordination composite material and preparation method thereof
  • Porous carbon-loaded monatomic metal nitrogen coordination composite material and preparation method thereof

Examples

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Effect test

Embodiment 1-7

[0035] Example 1-7: Preparation of Porous Carbon Supported Single-atom Metal Nitrogen Coordination Composite Materials

Embodiment 1

[0036] Example 1 Preparation of porous carbon-supported single-atom iron-nitrogen coordination composites

[0037] (1) The Ketjen Black (model ECP-600JD, pore diameter of 0.5-20 nanometers, specific surface area of ​​1400 square meters per gram) purchased from Japan LION Company is 1:2 (porous carbon is 1:2) to iron nitrate mass ratio 60 mg, ferric nitrate is 120 mg) into 5 ml of deionized water, add glucose to 1.2 g, ultrasonically disperse evenly, let stand for adsorption for 24 hours, wash with water and centrifuge, and dry at 60°C for 24 hours at a vacuum of -0.1 MPa. Obtain about 200 mg of precursor;

[0038] (2) Grinding the precursor with melamine (mass ratio of precursor to melamine is 1:5) and transferring to the downstream of the double-temperature zone heating furnace (downstream along the direction of gas introduction); under the protection of inert gas , the downstream powder is heat-treated at 800°C for 2-4 hours, and then cooled to room temperature, and the p...

Embodiment 2

[0039] Example 2 Preparation of porous carbon-supported single-atom manganese-nitrogen coordination composites

[0040] Prepare the porous carbon-loaded manganese-nitrogen coordination composite material according to the same method as in Example 1, the difference is: the transition metal salt is manganese nitrate, and the mass ratio of porous carbon to manganese nitrate is 6:5 (60 mg of porous carbon, nitric acid 50 mg of manganese and 5 ml of deionized water).

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Abstract

The invention discloses a porous carbon loaded monatomic metal nitrogen coordination composite material and a preparation method thereof. In the composite material, metal is fixed on a porous carbon carrier in an atomic-scale dispersed metal nitrogen coordination form. The preparation method comprises the following steps: (1) adsorbing a metal salt and a complex by using porous carbon to obtain aprecursor; and (2) physically grinding the precursor and a nitrogen source, and carrying out heat treatment in an inert atmosphere. The preparation method is low in cost, simple in process, clear in product, high in loading capacity, good in stability and suitable for large-scale production, and metal is dispersed in an atomic scale. In addition, the porous carbon loaded monatomic metal nitrogen coordination composite material has excellent catalytic performance in oxygen reduction, carbon dioxide reduction and nitrogen reduction reactions, and is obviously superior to other reported catalystsof the same type.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a porous carbon-supported monoatomic metal nitrogen coordination composite material and a preparation method thereof. Background technique [0002] Because single-atom materials have the advantages of both homogeneous catalysis and heterogeneous catalysis, and also make up the difference between the two, they have attracted much attention in recent years. Compared with heterogeneous materials, single-atom materials maximize the utilization of atoms, and the uniform active sites with tunable electronic structures are conducive to the improvement of catalytic activity and selectivity, while having excellent stability different from homogeneous catalysts. and circularity. In the past few years, a large number of single-atom catalysts have been used in thermocatalytic reactions (such as carbon monoxide oxidation, water gas shift reaction and methan...

Claims

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Application Information

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IPC IPC(8): C01B21/06C01B32/05
CPCC01B21/0622C01B21/0615C01B32/05C01P2002/72C01P2004/03C01P2004/04C01P2002/88
Inventor 胡劲松赵璐张云
Owner INST OF CHEM CHINESE ACAD OF SCI
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