Porous carbon nanometer fiber-supported nanocrystal catalyst and preparation method thereof

A technology of nanofibers and nanocrystals, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of loss of photocatalytic activity, high energy consumption, unsuitability, etc., and achieve energy saving Consumption, reduction of production cost, effect of high specific surface area

Inactive Publication Date: 2009-06-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a high temperature is not conducive to obtaining a catalyst with suitable grain size and crystal phase structure. For example, anatase titanium dioxide will completely transform into rutile titanium dioxide above 800 °C and lose its photocatalytic activity; it will produce more energy consumption, which is not conducive t

Method used

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  • Porous carbon nanometer fiber-supported nanocrystal catalyst and preparation method thereof
  • Porous carbon nanometer fiber-supported nanocrystal catalyst and preparation method thereof
  • Porous carbon nanometer fiber-supported nanocrystal catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 8 mL of tetrabutyl titanate was dissolved in 50 mL of polyacrylonitrile / dimethylformamide solution with a mass concentration of 10%, and then ultrasonically stirred to form a uniform spinning solution for electrospinning. During the electrospinning process, a No. 12 injection needle with an inner diameter of 1.1mm was selected, the applied electrostatic voltage was 15kV, the flow rate of the spinning solution was 0.5mL / h, the receiving distance between the metal cylinder and the needle was 20cm, and the outer diameter of the cylinder was The line speed is 10m / s, and after 5 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The electrospun nanofiber mat / membrane was stretched under constant tension at 135°C for 15min, and the tension applied along the longitudinal direction of the fiber mat / membrane was 10MPa, and then pre-oxidized in air at 250°C for 1h to obtain a stable chemical nanofibers. Finally, t...

Embodiment 2

[0030] 8 mL of tetrabutyl titanate and 0.2 g of silver nitrate were dissolved in 60 mL of 10% polyacrylonitrile / dimethylformamide solution, and then ultrasonically stirred to form a uniform spinning solution for electrospinning. According to the electrospinning process, thermal drawing and pre-oxidation process in Example 1, stabilized nanofibers were obtained. Finally, immerse the stabilized nanofibers in a KOH solution with a concentration of 1mol / L for 2h, take them out and place them in an activation furnace at 600°C for 2h under an ammonia atmosphere, the flow rate of ammonia gas is 10mL / min, heating and cooling The speeds are 3°C / min and 10°C / min, respectively, take it out after cooling and wash with 1mol / L HCl solution and deionized water several times, then the porous carbon nanofiber supported silver and titanium dioxide two-component catalyst can be obtained, in which the silver The particle diameter is about 10nm, and the weight percent content is about 2% (see im...

Embodiment 3

[0032] 4 g of silver nitrate was dissolved in 50 mL of polyacrylonitrile / dimethylformamide solution with a mass concentration of 10%, and then ultrasonically stirred to form a uniform spinning solution for electrospinning. During the electrospinning process, a No. 9 injection needle with an inner diameter of 0.9mm was selected, the applied electrostatic voltage was 12kV, the flow rate of the spinning liquid was 0.3mL / h, the receiving distance between the metal cylinder and the needle was 20cm, and the outer diameter of the cylinder was The line speed is 10m / s, and after 5 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The electrospun nanofiber mat / membrane was stretched under constant tension at 135°C for 10min, the tension applied along the longitudinal direction of the fiber mat / membrane was 5MPa, and then pre-oxidized in air at 250°C for 1h to obtain a stable chemical nanofibers. Finally, immerse the sta...

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Abstract

The invention provides a porous-carbon nano-fiber supported nano-grain catalyst and a preparation method thereof. A porous polyacrylonitrile-based carbon nano-fiber supported nano-grain catalyst is prepared by adopting an electrostatic spinning process, constant-tension hot stretching, preoxidation and chemical activation at a temperature between 500 and 1,000 DEG C. Porous-carbon nano-fiber has the diameter between 100 and 500 nanometers, the aperture between 1 and 500 nanometers, the porosity between 0.1 and 1.0 cm<3>/g and the specific surface area between 100 and 2,000 m<2>/g, and catalyst particles supported on the surface of the nano-fiber has the aperture between 1 and 100 nanometers and the weight percentage content between 1 and 40 percent. The preparation method has the advantage of simple process, and can prepare the porous-carbon nano-fiber supported nano-grain catalyst with high porosity, large specific surface area, strong adsorption activity and catalytic efficiency through the chemical activation at a low temperature.

Description

technical field [0001] The invention relates to a porous carbon nanofiber-supported nanocrystalline catalyst and a preparation method thereof. The prepared nanomaterial can be used as a catalyst for heterogeneous catalytic reactions, and specifically relates to photocatalysts, bactericides, ammonia synthesis catalysts, polymerization catalysts and the like. Background technique [0002] Carbon nanofiber is a one-dimensional nanomaterial with a huge specific surface area and aspect ratio, and a large number of surface atoms in a metastable state, so it has special effects such as small size effect, surface or interface effect, and quantum size effect. Therefore, it is widely used as the carrier of catalyst nanoparticles such as silver and titanium dioxide. [0003] In carbon nanofiber-supported nanocrystalline catalysts, carbon nanofibers can absorb and enrich reactants, and can transfer the adsorbed reactants to the active sites of nanocrystalline catalysts to react, playing...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J21/06B01J21/18
Inventor 于运花滕冬华杨小平
Owner BEIJING UNIV OF CHEM TECH
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