改質氫氧化鋁粉催化劑對鋁/水產氫反應之研究

The effect of modified catalyst Al(OH3) powders on the hydrogen generation from Al/water reaction

許聿志(YU-CHIH HSU)

指導教授 ： 王宏文

中原大學/理學院/化學研究所/碩士(2019年)

https://doi.org/10.6840/cycu201900420

摘要

在產氫反應中鋁粉、氫氧化鋁、水的比例通常為1:1:200(恆溫產氫)和1:1:10(快速產氫)。在恆溫產氫反應中通常反應所需時間約為3~10小時，跟催化劑能力有絕對的關係。本研究希望在製備催化劑氫氧化鋁時加入鈦雜質(Ti)後能夠使產氫速度提升。故我們利用自製的1 g氫氧化鋁粉(T和P-系列)加入異丙醇基鈦和鈦酸四丁酯製備後取各1g和200 ml二度水進行 1:1:200 的產氫反應，可以發現恆溫產氫從原本的10h縮減至7h即可完全反應，而在快速產氫方面只需5 min即可反應完全，代表說利用鈦改質催化劑能在產氫反應中達到更佳的效果。
在先前的實驗中我們得知添加硼氫化鈉，能夠有效抑制顆粒大小的成長 ，故我們更進一步的添加硼氫化鈉來改質氫氧化鋁，P-系列的顆粒從30-50nm減小至20-30nm，而T-系列則由18-24nm減小至16-20nm，反應也有明顯的增快，由此可知添加硼氫化能能夠有效抑制顆粒成長以達到提升反應的效果。
最後我們將先前產氫完所遺留下來及市售的氫氧化鋁再一次回收利用，發現其反應並不是太好，所以藉由球磨的方式將粉末顆粒磨細，以此來觀察是否能提升產氫的結果。恆溫產氫、快速產氫及市售的氫氧化鋁，分別從需要16、20、14h，縮減至4、8、8h，都有明顯的提升，因此我們知道藉由球磨將粉末磨細是能夠有效提升催化能力進而增進鋁與水反應產氫的效果。

關鍵字

氫氧化鋁

並列摘要

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.

並列關鍵字

alumunum hydroxide

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