| 研究生: |
李志昇 Li, Jr-Sheng |
|---|---|
| 論文名稱: |
含金奈米粒子之一維二氧化鈦材料的製備及催化探討 Fabrication of Gold Nanoparticles on Titanium Dioxide Nanowires and Its Applications in Catalysis |
| 指導教授: |
林榮良
Lin, Jong-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 75 |
| 中文關鍵詞: | 金 、二氧化鈦 、催化 、一氧化碳 |
| 外文關鍵詞: | CO, catalysis, gold, titanium dioxide |
| 相關次數: | 點閱:73 下載:3 |
| 分享至: |
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摘 要
1980年代,Haruta博士開始發表了一連串有關低溫氧化一氧化碳的論文,他所用的催化劑為覆載金奈米粒子的二氧化鈦(此二氧化鈦擔體粉末為不規則形狀的顆粒所組成),展現了金奈米粒子在催化上的活性。本篇論文報導二氧化鈦奈米線上覆載金奈米粒子的製備方法,並探討此材料對CO氧化的催化性質。
我們利用三種方法製備含金奈米粒子的一維二氧化鈦,第一種方法是使用Chen和Kimura二人在1999年所發表的方法,先製備金奈米粒子,再於製備一維二氧化鈦的過程中加入金奈米粒子。第二種方法是分別先製備金奈米粒子和一維二氧化鈦之後,在適當的pH值下,讓金奈米粒子鍵結在二氧化鈦上。第三種方法則是使用Haruta等人在1991年發表的沉積-沉澱法,我們先製備一維二氧化鈦,再於合成金奈米粒子的過程中加入一維二氧化鈦。我們的TEM,XRD,UV-Vis和XPS結果顯示第二種方法可以製備出金奈米粒子大小相似且高覆蓋率的二氧化鈦奈米線。以此材料當催化劑可以在70℃將CO氧化成CO2。但純的二氧化鈦奈米線並沒有此催化效果。我們也討論了Au/TiO2催化CO氧化的反應機構。
Abstract
In 1980`s, Dr. Haruta has begun to issue the reports about the oxidation of carbon monoxide at lower temperatures, using gold nanoparticles supported on titanium dioxide with an irregular particle shape. These studies showed the catalytic activity of gold nanoparticles. In the present study, we report the preparation of titanium dioxide nanowires loaded with gold nanoparticles and its catalytic activity toward CO oxidation.
We used three different methods to fabricate gold nanoparticles supported on one-dimensional TiO2. In the first method, we fabricated gold nanoparticles first and then added the particles into the solutions used for making one-dimensional TiO2, based on the method reported by Chen and Kimura in 1999. In the second method, gold nanoparticles and one-dimensional TiO2 were prepared separately and mixed together at a proper pH value. At last, we used the deposition-precipitation method published by Haruta in 1991. We fabricated one dimensional TiO2 first, and then added it into the solutions for making gold nanoparticles. Our characterization results of TEM, XRD, UV-Vis and XPS showed that gold nanoparticles with a similar size could be firmly distributed on TiO2 nanowires at a high coverage. This material was able to catalyze CO oxidation at 70℃, whereas pure TiO2 nanowires did not have this catalytic activity. The mechanism of CO oxidation of Au/ TiO2 is also discussed in this thesis.
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