Method for preparing nitrogen doped grading-hole porous carbon microspheres

A technology of porous carbon and nitrogen doping, which is applied in the direction of carbon preparation/purification, etc., to achieve the effect of easy operation and low equipment requirements

Inactive Publication Date: 2012-07-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional techniques for regulating the structure and surface chemical properties of carbon material carriers have defects. How to create new carbon-based materials using cheap carbon sources, such as porous carbon doped with heteroatoms and whose pore structure and surface properties can b

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  • Method for preparing nitrogen doped grading-hole porous carbon microspheres
  • Method for preparing nitrogen doped grading-hole porous carbon microspheres

Examples

Experimental program
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Example Embodiment

[0014] Example one

[0015] Weigh 1g of ammonium chloride and 2g of porous corn starch and mix them, add 20 mL of deionized water, stir magnetically for 3 hours to make the porous corn starch fully adsorb ammonium chloride, then filter and dry to obtain porous corn with ammonium chloride. Starch; Then, the obtained porous corn starch adsorbed with ammonium chloride is heated to 600°C at a heating rate of 5°C / min under the protection of nitrogen in a tubular carbonization furnace and kept for 2h, and then naturally cooled to room temperature, The nitrogen-doped porous carbon microspheres were prepared.

Example Embodiment

[0016] Example two

[0017] After weighing 1g of ammonium chloride and 1g of porous potato starch, add 20mL of deionized water, magnetically stir for 4h, make the porous potato starch fully adsorb ammonium chloride, then suction filter and dry to obtain porous potato with ammonium chloride. Starch; Then, the obtained porous potato starch adsorbed with ammonium chloride is heated to 700°C at a heating rate of 3°C / min under the protection of nitrogen in a tubular carbonization furnace and kept for 4h, and then naturally cooled to room temperature, The nitrogen-doped porous carbon microspheres were prepared.

Example Embodiment

[0018] Example three

[0019] After weighing 3g of ammonium chloride and 2g of porous tapioca starch, add 50mL of deionized water and magnetically stir for 6h to make the porous tapioca starch fully adsorb the ammonium chloride, then suction filtered and dried to obtain porous tapioca with ammonium chloride. Starch; Then, the obtained porous tapioca starch adsorbed with ammonium chloride is heated to 800°C at a heating rate of 10°C / min under the protection of nitrogen in a tubular carbonization furnace and kept for 3h, and then naturally cooled to room temperature, The nitrogen-doped porous carbon microspheres were prepared.

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Abstract

The invention discloses a method for preparing nitrogen doped porous carbon microspheres and belongs to the technical field of carbon materials. The method for preparing the nitrogen doped porous carbon microspheres comprises the following two steps of: 1, adding 20-50 mL of deionized water into a certain mass ratio of ammonium salt (such as ammonium chloride, ammonium sulfate or ammonium nitrate) and porous starch, carrying out magnetic stirring for 3-6 hours so that the ammonium salt is sufficiently adsorbed by the porous starch, then carrying out suction filtration and drying to obtain the porous starch with the ammonium salt; and 2, carbonizing the porous starch adsorbed with the ammonium salt for 2-6 hours at the temperature of 600-900 DEG C under the protection of inert atmosphere to obtain the nitrogen doped porous carbon microspheres. According to the invention, the used raw material in the method is the cheap and available commercialized porous starch; the nitrogen doped porous carbon microsphere is prepared on the basis that the original porous morphology of the porous starch is ensured, preparation process has no high requirement on equipment and is easy to operate, the preparation of the porous carbon microsphere which has a porous structure and is doped with nitrogen atoms is achieved by one step; and the material prepared by using the method has a potential application prospect in the fields of biological materials, catalysis, electrochemistry and the like.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped porous carbon microspheres, belonging to the technical field of carbon materials. Background technique [0002] The well-developed pore structure and rich surface chemical functional groups of carbon materials make them have broad application prospects in many fields. The traditional techniques for adjusting the structure and surface chemical properties of carbon material carriers have defects. How to create new carbon-based materials using cheap carbon sources, such as porous carbon doped with heteroatoms and whose pore structure and surface properties can be adjusted The material has attracted much attention at home and abroad. [0003] Starch or modified porous starch is a renewable natural carbon source that is widely available and inexpensive. In "Preparation Method of Starch-based Carbon Microspheres" (Patent No.: 200710150251), Wang Chengyang et al. used starch as a carbon source t...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 邱介山于畅段江波张旭
Owner DALIAN UNIV OF TECH
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