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A method for preparing nitrogen-doped porous carbon nanomaterials using carbon dioxide

A technology of nitrogen-doped porous carbon and carbon dioxide, applied in chemical instruments and methods, nano-carbon, inorganic chemistry, etc., can solve problems such as harsh reaction conditions, and achieve the effects of low cost, large scalability, and energy saving

Active Publication Date: 2019-11-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problem of harsh reaction conditions in converting carbon dioxide into chemicals in the prior art, the present invention provides a method for preparing nitrogen-doped porous carbon nanomaterials by using carbon dioxide. The method absorbs carbon dioxide in a flammable alkaline solution, Then add magnesium powder to trigger self-propagating solution combustion reaction to obtain nitrogen-doped porous carbon nanomaterials. This method is low in cost, energy saving, process and product properties are controllable, and the reaction can be completed in a very short time

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  • A method for preparing nitrogen-doped porous carbon nanomaterials using carbon dioxide
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  • A method for preparing nitrogen-doped porous carbon nanomaterials using carbon dioxide

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Embodiment 1

[0044] (1) Passing excess carbon dioxide gas into an aqueous solution of hydrazine hydrate with a mass fraction of 98% carries out a chemical adsorption reaction, reaches adsorption equilibrium in 10 minutes, and obtains an aqueous solution of hydrazinoformate;

[0045] (2) Carbazate aqueous solution and magnesium powder are mixed according to a mass ratio of 4:1, and a complexation reaction occurs to form a uniform gel-like magnesium carbazate complex and magnesium powder mixture as a combustion precursor;

[0046] (3) Ignite the combustion precursor, a self-propagating combustion reaction occurs, and generate magnesium oxide and nitrogen-doped porous carbon nanomaterials; then wash the reaction product with 5mol / L hydrochloric acid aqueous solution to remove magnesium oxide impurities and obtain pure nitrogen-doped porous carbon carbon nanomaterials.

[0047] From figure 1 It can be seen from the XRD spectrum in the figure that the main peaks of the prepared carbon nanomate...

Embodiment 2

[0049] (1) passing excess carbon dioxide gas into an aqueous solution of hydrazine hydrate with a mass fraction of 60% to carry out a chemical adsorption reaction, reaching adsorption equilibrium in 10 minutes, and obtaining an aqueous solution of hydrazinoformate;

[0050] (2) The aqueous solution of carbazinate and magnesium powder are mixed according to a mass ratio of 6:1, and a complexation reaction occurs to form a mixture of a uniform gel-like magnesium carbazate complex and magnesium powder as a combustion precursor;

[0051] (3) Ignite the combustion precursor, a self-propagating combustion reaction occurs, and generate magnesium oxide and nitrogen-doped porous carbon nanomaterials; then wash the reaction product with 2mol / L hydrochloric acid aqueous solution to remove magnesium oxide impurities, and obtain pure nitrogen-doped porous carbon nanomaterials carbon nanomaterials.

[0052] The XRD results show that the main peaks of the prepared carbon nanomaterials are co...

Embodiment 3

[0054] (1) passing excess carbon dioxide gas into an ethanolamine aqueous solution with a mass fraction of 98% to carry out a chemical adsorption reaction, reaching adsorption equilibrium in 10 minutes, and obtaining a carbamate aqueous solution;

[0055] (2) The carbamate aqueous solution and magnesium powder are mixed according to the mass ratio of 5:1, and placed in an electric furnace at 90°C for 10 minutes, and a complexation reaction occurs to form a uniform gel-like magnesium carbamate complex and Magnesium powder mixture as a combustion precursor;

[0056] (3) Ignite the combustion precursor, a self-propagating combustion reaction occurs, and generate magnesium oxide and nitrogen-doped porous carbon nanomaterials; then wash the reaction product with 4mol / L hydrochloric acid aqueous solution to remove magnesium oxide impurities and obtain pure nitrogen-doped porous carbon carbon nanomaterials.

[0057] The XRD results show that the main peaks of the prepared carbon nan...

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Abstract

The invention relates to a method for preparing a nitrogen-doped porous carbon nanomaterial by using carbon dioxide and belongs to the technical field of novel materials. The method comprises the steps of firstly carrying out chemical adsorption reaction on carbon dioxide and a flammable alkaline solution; adding magnesium powder for complexing reaction to obtain a combustion precursor; and lighting the combustion precursor, carrying out self-propagating combustion reaction and pickling a reaction product to obtain the nitrogen-doped porous carbon nanomaterial. The method is low in cost, energy is saved, the technological process and the property of the product are controllable, the reaction can be completed within a very short period of time, the prepared product has a good porous structure, specific surface area and electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped porous carbon nanomaterials by using carbon dioxide, and belongs to the technical field of porous carbon nanomaterials. Background technique [0002] Carbon dioxide is the most important greenhouse gas on the earth, and reducing carbon dioxide emissions is a major strategic issue for governments and the scientific community of various countries today. At the same time, carbon dioxide is also the most widely distributed and abundant carbon resource, which means that humans can use it as a carbon source to convert it into energy, materials and chemical products while reducing carbon dioxide emissions as much as possible. It can be seen that, no matter from the perspective of resource utilization or environmental protection, the research and development of carbon dioxide fixation and chemical conversion are of great significance. The annual emission of carbon dioxide due to human activities i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205C01B32/184H01M4/96
CPCC01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2004/80C01P2006/40H01M4/96Y02E60/50
Inventor 陈鹏万徐春晓高鑫杜立勇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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