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Preparation method for CATON type visible photocatalytic overall water splitting catalyst

A catalyst, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, oxygen preparation, etc., can solve the problems of insufficient utilization of solar energy, low efficiency of all-photon water splitting with visible light, etc., and achieve the promotion of photogenerated electrons and holes. The separation, total water splitting efficiency is high, and the operation is easy to control.

Inactive Publication Date: 2015-09-09
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for preparing a catalytic material for total visible light water splitting, so as to solve the current problems of low efficiency of visible light full photolytic water splitting and insufficient use of solar energy

Method used

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  • Preparation method for CATON type visible photocatalytic overall water splitting catalyst
  • Preparation method for CATON type visible photocatalytic overall water splitting catalyst
  • Preparation method for CATON type visible photocatalytic overall water splitting catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Calcium chloride, aluminum chloride, tantalum pentachloride and urea are weighed in a molar ratio of 4:1:3:200, accurately weighed and put into methanol aqueous solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the program heating is 10 ℃ / min, the high temperature setting temperature is 600 ℃, and the holding time of the high temperature stage is 12 h. After natural cooling, the obtained Precursor. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 800°C, and the time is 24 hours. After cooling, the CATON powder is obtained. The purity of its products is not less than 99.79%, and the impurity content: carbon is less than 0.05%; chlorine is less than 0.13%. With CATON as the main catalyst, after stirring with 300 W xenon light for 24 hours (stirring speed 1000 rpm), the cocatalyst RhCrCoO was first loaded x The mixtur...

Embodiment 2

[0049] Calcium nitrate, aluminum nitrate, tantalum pentaethoxide and citric acid are in a molar ratio of 4:1:3:50, accurately weighed and put into methanol aqueous solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 800 ℃, and the holding time of the high temperature stage is 10 h. After natural cooling, the obtained Precursor. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 850°C, and the time is 6 hours. After cooling, the CATON powder is obtained. The purity of its products is not less than 99.91%, and the impurity content: carbon is less than 0.05%; chlorine is less than 0.02%. With CATON as the main catalyst, after stirring with 300 W xenon light for 24 hours (stirring speed 1000 rpm), the cocatalyst RhCrCoO was first loa...

Embodiment 3

[0051] Calcium nitrate, aluminum nitrate, tantalum pentachloride and citric acid are in a molar ratio of 4:1:3:50, accurately weighed and put into methanol aqueous solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 900 ℃, the holding time of the high temperature stage is 4 h, and after natural cooling, the obtained Precursor. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 850°C, and the time is 7 hours. After cooling, the CATON powder is obtained. The purity of its products is not less than 99.89%, and the impurity content: carbon is less than 0.04%; chlorine is less than 0.03%. With CATON as the main catalyst, after stirring with 300 W xenon light for 24 hours (stirring speed 1000 rpm), the cocatalyst RhCrCoO was first loaded x The ...

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Abstract

The invention discloses a preparation method for a CATON type visible photocatalytic overall water splitting catalyst. The preparation method comprises: sufficiently dissolving soluble calcium salt, soluble aluminum salt, soluble tantalum salt and a burning auxiliary agent in a methanol-water mixed solution, directly performing temperature programming in a muffle furnace so as to perform a burning reaction, keeping the high temperature stage for certain time, and performing natural cooling so as to form a predecessor; then, performing nitrogenization high-temperature treatment on the predecessor so as to obtain CATON perovskite type nitrogen oxide powder. CATON is used as a main catalyst, after light stirring, firstly, the CATON is loaded with a co-catalyst, and then, the CATON loaded with the co-catalyst is cladded with a nitrogen inhibitor so as to prepare the overall water splitting catalyst responding to the visible light. The preparation method disclosed by the invention has the advantages of high efficiency, high stability, high catalytic overall water splitting efficiency, and the like, is environmentally-friendly, has the catalytic activity of the visible light, can sufficiently transform and utilize solar energy, and is easy to apply and popularize, and the raw materials are easily available.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of a CATON type visible light total water splitting catalyst. Background technique [0002] As the global population continues to grow and life expectations rise, scientists estimate that total energy consumption worldwide will more than double by 2050 if society continues to use energy in the way it currently does. Fossil fuels are an unsustainable resource, and we must break our dependence on them. Among them, solar energy is the most potential alternative energy source. The challenge is: how to make the use of solar energy to the required scale. Photocatalytic overall water splitting is a hot research topic in the field of photocatalysis. Usually, nanostructured photocatalyst particles dissolved in solution are used. Through contact with these particles in solution, a series of chemical catalytic react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04C01B13/02
CPCY02E60/36Y02P20/133
Inventor 许家胜张杰
Owner BOHAI UNIV
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