Method for preparing catalytic material used in hydrogen production through catalytic photolysis of water by visible light

A technology of photocatalytic water splitting for hydrogen production and catalytic materials, applied in chemical instruments and methods, hydrogen production, physical/chemical process catalysts, etc. , to solve the problem of low utilization of visible light, conducive to popularization and application, and easy operation.

Inactive Publication Date: 2012-04-11
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of a catalytic material for hydrogen production by photocatalytic photolysis of water to solve the problems of low efficiency of hydrogen production by photocatalysis and photolysis of water and insufficient utilization of solar energy

Method used

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  • Method for preparing catalytic material used in hydrogen production through catalytic photolysis of water by visible light
  • Method for preparing catalytic material used in hydrogen production through catalytic photolysis of water by visible light

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[0020] The invention provides a preparation method of a catalytic material for hydrogen production by photocatalytic photolysis of water with visible light, which is specifically implemented according to the following steps:

[0021] step 1,

[0022] First, dissolve EDTA in ammonia water to make a 2mol / L EDTA solution;

[0023] Step 2,

[0024] Ba(NO 3 ) 2 and Cr(NO 3 ) 3 9H 2 O is dissolved in water to make a mixed solution, then add the EDTA solution configured in step 1 to the mixed solution, keep the amount of the EDTA substance the same as the amount of the total metal ion substance, then add the substance with the nitrate Auxiliary complexing agent with the same amount, the auxiliary complexing agent is one of citric acid, tartaric acid, oxalic acid, stir to dissolve, and then use ammonia water to adjust the pH value of the solution to 5-7;

[0025] Step 3,

[0026] Put the mixed solution prepared in step 2 into a water bath at 70-80°C, stir electrically until th...

Embodiment 1

[0032] Ba(NO 3 ) 2 1.31g and Cr(NO 3 ) 3 9H 2 Dissolve O2.38g in a beaker with deionized water, then add 7.7g of citric acid to the mixed solution, stir to dissolve it, and then add 7.5mL of 2mol / L EDTA solution. Adjust pH to pH=6 with ammonia water. Then put the mixed solution into a water bath at 80° C., and stir at constant temperature for a certain period of time. During the stirring process, the viscosity of the solution continued to increase until the system could be drawn, and the water bath heating was stopped. Cool in air to obtain a gel. It was dried at a temperature of 120° C. for 6 hours to obtain a xerogel. The dry gel is calcined at 350°C for 6 hours, and then calcined at 1000°C for 8 hours to obtain the green powder of BaCr 2 o 4 catalyst. According to Ce: BaCr 2 o 4 Weigh Ce(NO 3 ) 4 NH 4 NO 3 0.033g in a beaker, add appropriate amount of water to dissolve, then add 1.0gBaCr 2 o 4 For the powder, after ultrasonic dispersion for 15 minutes, mag...

Embodiment 2

[0034] According to the stoichiometric ratio of 1:2, Ba(NO 3 ) 2 2.62g and Cr(NO 3 ) 3 9H 2 O4.76g was dissolved in a beaker with deionized water, then 15.4g oxalic acid was added to the mixed solution, stirred to dissolve it, and then 15mL of 2mol / L EDTA solution was added. Adjust the acidity and alkalinity to pH=7 with ammonia water. Then the mixed solution was put into a water bath at 75° C. and stirred at constant temperature. During the stirring process, the viscosity of the sol continued to increase until the system could be drawn, and the water bath heating was stopped. Cool in air to obtain a gel. It was dried at 120° C. for 10 h to obtain a xerogel. The dry gel is calcined at 350°C for 10h, and then calcined at 900°C for 12h to obtain a green powder of BaCr 2 o 4 catalyst. According to Ce:BaCr 2 o 4 Weigh Ce(NO 3 ) 4 NH 4 NO 30.066g in a beaker, add appropriate amount of water to dissolve, then add 2.0gBaCr 2 o 4 For the powder, after ultrasonic disp...

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Abstract

The invention relates to a method for preparing a catalytic material used in hydrogen production through catalytic photolysis of water by visible light. The method is mainly characterized in that a compound oxide BaCr2O4 is prepared from barium nitrate and chromium nitrate serving as main raw materials by a sol-gel method in the presence of EDTA (ethylene diamine tetraacetic acid), citric acid, tartaric acid and the like serving as a compound complexant. The method has the following steps of: drying and crushing the compound oxide BaCr2O4, soaking in a cerous nitrate solution with a certain concentration, magnetically stirring for 3 hours, and standing; and heating and evaporating to dryness, drying for 10 hours at the temperature of 120 DEG C, roasting for 10 hours at the temperature of 350 DEG C, and roasting for 12 hours at the temperature of 1200 DEG C to obtain a doped Ce / BaCr2O4 photo-catalytic material. Compared with a RuO2 / TiO2 nano crystal photochemical catalyst, the photo-catalytic material is available in raw materials, low in cost, high in catalytic hydrogen production efficiency, has visible light catalytic activity, and is easy to apply and prompt, and can fully transform and use solar energy.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a preparation method of a photocatalytic material, in particular to a preparation method of a visible light catalytic photolysis water hydrogen production catalytic material. Background technique [0002] Since the early 1970s, Japanese scientists Fujishima and Honda discovered TiO 2 After the phenomenon of hydrogen production by photocatalytic water splitting on electrodes, the study of photocatalytic hydrogen production has attracted widespread attention. At present, there are mainly two problems in photocatalytic hydrogen production. On the one hand, semiconductors with energy gaps that match the solar spectrum such as (WO 3 , CdS), etc. have problems such as photocorrosion and toxicity, while p-type InP, GaP, GaInP 2 Although it has an ideal energy gap and is resistant to photocorrosion to a certain extent, because its energy level does not match the energy level...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26C01B3/04
CPCY02E60/364Y02E60/36Y02P20/133
Inventor 姚秉华姜海霞王寿平吴茜杨洁刘伟
Owner XIAN UNIV OF TECH
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