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Boron-nitrogen co-doped carbon material and preparation method and application thereof

A carbon material and co-doping technology, applied in chemical instruments and methods, catalyst activation/preparation, electrodes, etc., can solve the problems of limited production Faraday effect, limited industrial application, and scarcity of precious metals, so as to improve reduction activity and selectivity The effect of sex, method efficiency and low cost

Active Publication Date: 2019-05-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, precious metals are scarce and expensive, which greatly limits industrial applications
Therefore, non-precious metal catalysts (such as Mo nanofilms, Fe 2 o 3 -CNT) and metal-free catalysts (such as N-doped porous carbon, N-doped porous carbon MOF, B-doped graphene) have been intensively studied, but the yield of using them to synthesize ammonia and its Faraday effect are still very limited

Method used

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  • Boron-nitrogen co-doped carbon material and preparation method and application thereof
  • Boron-nitrogen co-doped carbon material and preparation method and application thereof
  • Boron-nitrogen co-doped carbon material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Boron nitride 0.2g and carbon material 0.1g are respectively placed in the center of two different temperature zones of a dual temperature zone tube furnace; the distance between the boron nitride and the carbon material is 15cm; Place 20mL of distilled water (intake end) at one end outside the zone, and the tube furnace heats up (the heating rate of the two temperature zones is 5°C / min). During the heating process, the distilled water outside the temperature zone is evaporated by the waste heat , a large amount of water vapor is generated; before the temperature is raised, the air in the tube is drawn out and supplemented with argon, which is used as a carrier gas to act on the whole experiment, and the argon flow rate is 50mL / min. Argon carries water vapor into the temperature zone where boron nitride is located for reaction. The temperature in the temperature zone of boron nitride is 1200°C. Water vapor reacts with boron nitride and keeps warm for 1 hour to obtain sma...

Embodiment 2

[0035] Boron nitride 0.8g and carbon material 0.1g are respectively placed in the center of two different temperature zones of a dual temperature zone tube furnace; the distance between the boron nitride and the carbon material is 15cm; Place 80mL of distilled water (intake end) at one end outside the zone, and the tube furnace heats up (the heating rate of the two temperature zones is 10°C / min). During the heating process, the distilled water outside the temperature zone is evaporated by the waste heat , a large amount of water vapor is generated; before the temperature is raised, the air in the tube is drawn out and supplemented with argon, which is used as a carrier gas to act on the entire experiment, and the argon flow rate is 100mL / min. Argon carries water vapor into the temperature zone where boron nitride is located for reaction. The temperature in the temperature zone of boron nitride is 800°C. Water vapor reacts with boron nitride and keeps warm for 3 hours to obtain ...

Embodiment 3

[0039]Place 0.8g of boron nitride and 0.1g of carbon material in the center of two different temperature zones of the dual temperature zone tube furnace; Carry out temperature rise (the temperature rise rate of the two temperature zones is 15°C / min). During the temperature rise process, the distilled water outside the temperature zone is evaporated by the waste heat of the air inlet temperature zone, producing a large amount of water vapor; In addition, argon was used as a carrier gas to act on the whole experiment, and the flow rate of argon was 200mL / min. Argon carries water vapor into the temperature zone where boron nitride is located for reaction. The temperature in the temperature zone of boron nitride is 1000°C. Water vapor reacts with boron nitride and keeps warm for 2 hours to obtain small precursor molecules; The air flow enters the high-temperature reaction zone of the carbon material. The temperature of the temperature zone where the carbon material is located is 8...

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Abstract

The invention belongs to the technical field of catalyst and ammonia preparation, and discloses a boron-nitrogen co-doped carbon material and a preparation method and application thereof. The method comprises the following steps: respectively placing boron nitride and a carbon material in different high temperature reaction regions of a reaction device, wherein boron nitride is located above a gasflow, and the carbon material is located below the gas flow; under the flow of carrier gas, transporting water vapor to a region where the boron nitride is located, and enabling boron nitride to react with the water vapor at a high temperature to obtain a precursor small molecule; transporting the precursor small molecule along with the gas flow to a region where the carbon material is located, and enabling the carbon material and the precursor small molecule to make a co-doping reaction to obtain the boron-nitrogen co-doped carbon material; the temperature of the high temperature reaction is800 to 1200 DEG C; the temperature of the co-doping reaction is 500 to 900 DEG C. The method is simple and low-cost, adopts the raw materials which are cheap and easy to obtain, and is environmentally friendly. The prepared boron-nitrogen co-doped carbon material has good catalytic efficiency when catalyzing nitrogen to prepare ammonia. The boron-nitrogen co-doped carbon material is used for catalyzing nitrogen to produce ammonia.

Description

technical field [0001] The invention belongs to the technical field of catalyst and ammonia gas preparation, and in particular relates to a boron-nitrogen co-doped carbon material and its preparation method and application. The application of the boron-nitrogen co-doped carbon material in the preparation of ammonia is used as a catalyst, especially a catalyst for ammonia reduction by nitrogen reduction, which catalyzes the reduction of nitrogen to ammonia. Background technique [0002] Ammonia is a very important chemical compound and industrial fertilizer. It can be used to make ammonia water, nitrogen fertilizer urea, compound fertilizers such as carbon urea, nitric acid, urea salt, soda ash and other substances, which have been widely used in chemical industry, light industry, chemical fertilizer, pharmaceutical, synthetic fiber and other fields. Furthermore, the nitrogen-containing organic intermediates, sulfa drugs, polyurethane, polyamide fiber and nitrile rubber in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10C25B1/00C25B11/06
Inventor 徐建铁肖峰张加奎陈香宏范庆华
Owner SOUTH CHINA UNIV OF TECH
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