| Summary: | 碩士 === 中原大學 === 化學研究所 === 106 === Hydrogen generation can be completed in 90 seconds using the ratio 1:3:10 of aluminum powder, aluminum hydroxide and water in the general rapid hydrogen production. However, if aluminum scrap is added, the hydrogen production rate will decrease. Using a homemade 9 g aluminum hydroxide powder (Test D) as the catalyst, aluminum scrap and aluminum powder (3 g, 1:2) can react with 30 ml of water for in a 3:9:30 hydrogen generation. It can be found that hydrogen production is completed in 9 minutes. It is then considered to be a feasible process to produce hydrogen using the heat generated initially by the aluminum powder for the aluminum waste powder in the reaction.
The aluminum scraps are subjected to hydrogen generation using further synthesized fine powders. The previously synthesized powder “Test D” has a particle size of 150~200 nm. The newly synthesized powder is about 50 nm using ethanol and sodium aluminate, NaAlO2. Their surface area are enhanced due to smaller particle sizes. The newly synthesized Al(OH)3, ……, using ethanol and sodium and aluminate catalyzed the best generation of hydrogen so far.
In the rapid production of hydrogen (1:3:10), aluminum scrap is used to produce hydrogen and it is found to be deficient in water. When the reaction is in half way, there is no water to continue the reaction. Therefore, we have to use the ratio of 1:3:30 for aluminum scrap, aluminum hydroxide and water to produce hydrogen. It is found that hydrogen production can be completed within 18 minutes without using aluminum powder.
The 1:3:30 method will increase the amount of water which caused a slower speed of the entire hydrogen production process. Therefore, an improved method is developed. A condensate tube was set up at the outlet of the hydrogen-producing reactor to recover the water and continue the hydrogen generation process. This reaction can completely produce hydrogen within 9 minutes. It is said that condensation is an effective way to recycle water during the reaction.
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