Solar photolysis water hydrogen production catalyst and preparation method

A technology for photo-splitting water for hydrogen production and solar energy, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Highly active effect

Inactive Publication Date: 2010-07-07
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts that can be active in the visible light region are too low in activity, and there is photocorrosion, which needs to be suppressed by a sacrificial agent, resulting in low energy conversion efficiency and cannot fully utilize solar energy for catalysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 5 grams of mesoporous carbon molecular sieve CMK-1 with 100 milliliters of 5 mol / liter sulfuric acid for 21 hours, then add 10 grams of titanium tetrapropylamine to it, react under stirring for 120 hours, vacuum filter, wash and dry at 80°C for 6 hours . Oxidize the dried sample in the air for 15 minutes, transfer it to nitrogen, bake at 500°C for 4 hours, and then bake at 450°C for 9 hours in an air atmosphere to obtain a photocatalyst. The composition of the obtained photocatalyst is: 75% titanium dioxide, carbon 18%, nitrogen 7%. Mix 1 gram of the catalyst with 200 milliliters of water and irradiate 200 milliliters of the reaction solution with 400-620nm light at a light intensity of 150mW / cm 2 , the irradiation cross-sectional area is 7cm 2 , Nitrogen was passed for 20 minutes before the light, and the sample was analyzed 2 hours after the light was started, and the efficiency of hydrogen production was calculated to be 105 μmolg -1 h -1 .

Embodiment 2

[0020] Mix 5 grams of mesoporous carbon molecular sieve CMK-3 with 100 milliliters of 1 mol / liter nitric acid for 10 hours, then add 75 grams of titanium n-butoxide to it, react for 2 hours under stirring, vacuum filter, wash and dry at 100°C for 2 hours . After the dried sample was oxidized in air for 120 minutes, it was transferred to argon and baked at 400°C for 10 hours, and then fired at 600°C for 5 hours in an air atmosphere to obtain a photocatalyst. The composition of the obtained photocatalyst was: titanium dioxide 90%, Carbon 10%, Nitrogen 0%. Mix 1 gram of the catalyst with 200 milliliters of water and irradiate 200 milliliters of the reaction solution with 400-620nm light at a light intensity of 150mW / cm 2 , the irradiation cross-sectional area is 7cm 2 , Nitrogen 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 μmolg -1 h -1 .

Embodiment 3

[0022] Mix 5 grams of mesoporous carbon molecular sieve CMK-3 with 100 milliliters of 10 mol / liter hydrochloric acid for 5 hours, then add 5 grams of titanium tetraethylamine, react under stirring for 48 hours, vacuum filter, wash and dry at 100°C for 5 hours Hour. After the dried sample was oxidized in air for 5 minutes, it was transferred to helium and roasted at 600°C for 5 hours, and then roasted at 850°C for 3 hours in an air atmosphere to obtain a photocatalyst. The composition of the obtained photocatalyst was: titanium dioxide 93%, Carbon 1%, Nitrogen 6%. Mix 1 gram of the catalyst with 200 milliliters of water and irradiate 200 milliliters of the reaction solution with 400-620nm light at a light intensity of 150mW / cm 2 , the irradiation cross-sectional area is 7cm 2 , Nitrogen was passed for 45 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 195 μmolg -1 h -1 . ...

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Abstract

A solar photolysis water hydrogen production catalyst consists of (by weight proportion): 75-98% of titanium dioxide, 1-20% of carbon and 0-10% of nitrogen. The preparation method includes that: a mesoporous carbon molecular sieves are mixed with 1-10 mol / L acid for 0.5-24 hours, and then titanium source is added to the mixture, and the mixture reacts for 2-120 hours under stirring state and is filtered under vacuum state, the filtrate is dried for 2-10 hours at the temperature of 60-100 DEG C for preparing samples; the dried sample is oxidized in air for 5-120 min, and transferred to insert gas for baking 2-10 hours at the temperature of 400-1000 DEG C, and the sample is then baked 3-9 hours at the temperature of 450-850 DEG C in air so as to obtain the photocatalyst. The invention ensures the catalyst to have high visible light activity, and enables the hydrogen production efficiency to be more than 100 umolg-1h-1 under the irradiation of 400-620nm visible light.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method, in particular to a catalyst and a preparation method for preparing hydrogen by solar photolysis of water. Background technique [0002] As the lifeblood of the world economy and the driving force of social development, energy has been highly valued by all countries. my country's total energy demand is large and its growth rate is fast, and it has become the second largest energy producer and consumer in the world after the United States. However, reserves of fossil fuels, which account for 90% of the world's energy supply, are increasingly depleted. And the use of fossil fuels has led to serious environmental pollution, the carbon dioxide (CO2) released by the combustion of fossil fuels 2 ) is the most important greenhouse gas. Over the past 100 years, the global average surface temperature has risen by 0.3-0.6°C, and sea level has risen by 14-25cm. More and more people are turning their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/00B01J21/06C01B3/04
CPCY02E60/364Y02E60/36
Inventor 张晔赵亮富
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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