A kind of porous ceramic and its preparation method and application

A technology of porous ceramics and pore walls, applied in the field of porous ceramics, can solve problems such as potential safety hazards and restrictions on the acceptance of the automobile market

Active Publication Date: 2021-10-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the flammable and explosive nature of hydrogen, and the high-pressure gas tanks will also bring safety hazards during driving, these shortcomings limit the market acceptance of hydrogen-powered vehicles

Method used

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  • A kind of porous ceramic and its preparation method and application
  • A kind of porous ceramic and its preparation method and application
  • A kind of porous ceramic and its preparation method and application

Examples

Experimental program
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preparation example Construction

[0071] The present invention also provides a preparation method of the catalytic microreactor, comprising the following steps: after impregnating the silicon carbide porous substrate in the reverse microemulsion, drying, pre-oxidation treatment, cracking treatment, calcination and processing , to obtain the porous silicon carbide ceramic material; the inverse microemulsion includes an oil phase that is dissolved with a silicon source that can generate reducing gas and a carbon source that can adjust the oil phase viscosity and surface tension, and is dissolved with nickel ion water phase and emulsifier. The use of the carbon source can improve the film-forming performance of the inverse microemulsion by adjusting the viscosity and surface tension of the oil phase. The preparation method of the catalytic microreactor adopts a silicon source capable of generating a reducing atmosphere as the precursor of the silicon carbide film embedded with the nano-nickel particles. After th...

Embodiment 1

[0100] The present embodiment adopts a density of 1.95g / cm 3 , the open porosity is 38%, and the recrystallized porous silicon carbide with a pore diameter of about 50 microns is used as the matrix.

[0101] Mix 15g of xylene, 1g of epoxy resin, 1.6g of polycarbosilane, 0.5g of CTAB, 0.2g of span80, 2g of nickel nitrate, and 1g of water, stir, fully dissolve and emulsify as an inverse microemulsion, and make porous silicon carbide The substrate was immersed for 30 minutes, then taken out, dried at 30°C for 8 hours, pre-oxidized at 250°C for 120 minutes, and cracked at 600°C under an argon atmosphere to obtain the porous ceramic. The heating regime of the cracking treatment is to raise the temperature to 600° C. at a rate of 1° C. / min, and then keep the heat for 30 minutes. That is, a porous ceramic including an amorphous silicon carbide film with a thickness of 2 micrometers embedded with nickel particles of about 100 nanometers was obtained. figure 1 It is a micrograph of t...

Embodiment 2

[0107] The present embodiment adopts a density of 1.85g / cm 3 The recrystallized porous silicon carbide with an open porosity of 41% and a pore diameter of about 100 microns is used as the matrix.

[0108] Mix 15g of xylene, 1g of epoxy resin, 1.6g of polycarbosilane, 0.8g of CTAB, 0.4g of DTAC, 3.5g of nickel nitrate, and 1g of water, stir, fully dissolve and emulsify as an inverse microemulsion, and carbonize the porous After the silicon was immersed for 50 minutes, it was taken out, dried at 50°C for 8 hours, pre-oxidized at 250°C for 120 minutes, and cracked at 800°C under an argon atmosphere to obtain the nickel particles embedded with about 120 nanometers and a thickness of 15 Micron porous ceramics with amorphous silicon carbide films.

[0109] The porous ceramic is used as a micro-reactor of the micro-reaction system after size processing, and the steam reforming of ethanol is carried out to produce hydrogen. The reaction temperature is 550 ° C, and the ethanol convers...

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Abstract

The invention discloses a porous ceramic, which comprises a silicon carbide porous ceramic substrate; a silicon carbide film is attached to the surface of a hole wall of the silicon carbide porous ceramic substrate; and nanometer nickel particles are embedded in the silicon carbide film. The invention also discloses a catalytic microreactor and a catalytic microreaction system comprising the porous ceramic, and a preparation method of the catalytic microreactor. The porous ceramic can reduce the reaction space and help realize the miniaturization of the reforming hydrogen production system, and the nano-nickel particles embedded in the silicon carbide film can improve the binding strength of the catalyst load, and help realize the vehicle-mounted on-line hydrogen production.

Description

technical field [0001] The invention relates to a porous ceramic and its preparation method and application, belonging to the field of porous ceramics. Background technique [0002] In recent years, due to the gradual depletion of fossil fuels and the rapid increase in the number of fuel vehicles that have had a negative impact on urban air quality, the promotion of new energy vehicles has been carried out rapidly. [0003] New energy vehicles include those using hydrogen fuel cells. New energy vehicles using hydrogen fuel cells can directly convert hydrogen energy into electric energy to drive vehicles, while only producing water instead of CO 2 and other exhaust gas, so it has the advantages of high efficiency and environmental protection, and it is one of the development directions of new energy vehicles in the future. [0004] However, in the current vehicles that use hydrogen as energy, the storage method of hydrogen is mainly to provide hydrogen for the on-board fuel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/32B01J8/02B01J19/00B01J27/224B01J35/10C04B41/88
CPCB01J8/009B01J8/02B01J19/0093B01J27/224B01J35/10B01J2219/00862C01B3/326C01B2203/0233C01B2203/066C01B2203/1058C01B2203/1082C01B2203/1217C01B2203/1229C04B41/009C04B41/5144C04B41/88C04B41/5059C04B41/4539C04B41/4554C04B41/4552C04B35/565C04B38/00
Inventor 郭文明肖汉宁胡天赐
Owner HUNAN UNIV
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