碩士 / 中原大學 / 化學研究所 / 107 / In the hydrogen production reaction, the ratio of aluminum powder, aluminum hydroxide, and water is usually 1:1:200 (slow hydrogenreaction) and 1:1:10 (rapid hydrogen reaction). In the reaction, it usually takes a long time to react. However, we anticipated that the hydrogen production rate can be increased after the addition of impurities in the preparation of the catalyst. We used the self-made 1 g aluminum hydroxide powder (T and P-series) and modified the catalyst by adding isopropanol titanium and tetrabutyl titanate. It can be found that the slow hydrogen reaction can be completed from the original 10h to 7h, and it takes only 5 minutes in the rapid hydrogen production for a completed reacted. The use of a modified catalyst results in a better hydrogen generation rate reaction.
In the previous experiments, we also learned that the addition of sodium borohydride can effectively inhibit the growth of the particle size, therefore we added sodium borohydride to modify the aluminum hydroxide, and the P-series particles are reduced from 30-50 nm to 20-30nm, while the T-series is reduced from 18-24nm to 16-20nm, and the hydrogen generation rate in the reaction is also significantly increased. It can be seen that the addition of borohydride can effectively inhibit the growth of particles to enhance the reaction.
Finally, we recycled the product Al(OH)3from the previous hydrogen reactions as well as the commercially available Al(OH)3 powders. These powders do not have good catalytic effect on the Al/water reaction. We would like to check the catalytic effect of these powders by ball milling. As a result of reduction particle size of Al(OH)3, the slow hydrogen production, rapid hydrogen production and commercially available aluminum hydroxide have been significantly reduced from 16, 20, 14h to 4, 8, 8h. It is concluded that it is effective in enhancing hydrogen production by ball milling grinding the recycled catalyst powders.
| Identifer | oai:union.ndltd.org:TW/107CYCU5065021 |
| Date | January 2019 |
| Creators | YU-CHIH HSU, 許聿志 |
| Contributors | Hong-Wen Wong, 王宏文 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 130 |
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