Method for preparing catalytic material used in hydrogen production through catalytic photolysis of water by visible light
A technology of photocatalytic water splitting to produce hydrogen and catalytic materials, which is applied in chemical instruments and methods, hydrogen production, physical/chemical process catalysts, etc., and can solve the problems of low efficiency of photocatalytic photocatalytic hydrogen production from water splitting and insufficient use of solar energy , to achieve the effect of solving the low utilization rate of visible light, facilitating the popularization and application, and improving the photocatalytic activity
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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 dis...
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