Catalyst for photocatalytic water splitting hydrogen production and preparation method and application of catalyst
A technology of photolysis of water to produce hydrogen and catalysts, which is applied in the direction of physical/chemical process catalysts, hydrogen production, chemical instruments and methods, etc. It can solve the problems of low catalyst activity, inability to fully utilize solar energy, and low energy conversion efficiency. The effect of high visible light activity
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Embodiment 1
[0017] Mix 5 grams of carbon molecular sieve CMK-1 with 100 grams of 5 mol / liter sulfuric acid for 21 hours, filter and dry, add 10 grams of tetrapropylamine titanium to it, react for 120 hours under stirring, vacuum filter, wash and dry at 80 ° C Let dry for 6 hours. Put the dried sample in the air for 15 minutes, transfer it to nitrogen, and bake it at 500°C for 4 hours, and then bake it at 450°C for 9 hours in an air atmosphere to obtain a photocatalyst. The composition of the obtained photocatalyst is: titanium dioxide 95%, Carbon 5%. Mix 1 gram of the catalyst with 200 milliliters of water and irradiate the reaction solution with 400-620nm light at a light intensity of 100mW / cm 2 , Nitrogen gas was passed for 20 minutes before the light, and the sample was analyzed 5 hours after the light was started, and the hydrogen production efficiency was calculated to be 112 μmol·g -1 h -1 .
Embodiment 2
[0019] Mix 5 grams of carbon molecular sieve CMK-3 with 250 grams of 1 mol / liter nitric acid for 10 hours, then add 75 grams of titanium n-butoxide to it, react under stirring for 2 hours, vacuum filter, wash and dry at 100°C for 2 hours. Put the dried sample in the air for 120 minutes, then transfer it to argon and bake it at 400°C for 10 hours, and then bake it at 600°C for 5 hours in the air atmosphere to obtain the photocatalyst. The composition of the obtained photocatalyst is: titanium dioxide 96.9% , carbon 3.1%. Mix 1 gram of the catalyst with 100 milliliters of water and irradiate the reaction solution with 400-620nm light at a light intensity of 250mW / cm 2 , Nitrogen gas was passed for 10 minutes before the light, and the sample was analyzed 2 hours after the light was started, and the hydrogen production efficiency was calculated to be 180 μmol g -1 h -1 .
Embodiment 3
[0021] Mix 5 g of activated carbon with 75 g of 10 mol / L hydrochloric acid for 5 hours, then add 5 g of titanium tetraethylamine, react under stirring for 48 hours, vacuum filter, wash and dry at 100° C. for 5 hours. Put the dried sample in the air for 5 minutes, then transfer it to helium and bake it at 1000°C for 5 hours, and then bake it at 550°C for 3 hours in the air atmosphere to obtain the photocatalyst. The composition of the obtained photocatalyst is: titanium dioxide 99.9% , Carbon 0.1%. Mix 1 gram of the catalyst with 500 milliliters of water and irradiate the reaction solution with 400-620nm light at a light intensity of 100mW / cm 2 , Nitrogen gas was passed for 45 minutes before the light, and the sample was analyzed 6 hours after the light was started, and the hydrogen production efficiency was calculated to be 105 μmol g -1 h -1 .
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