| 研究生: |
陳誌偉 Chen, Chih-Wei |
|---|---|
| 論文名稱: |
3-氯丙醇在Ni(111)表面上的熱反應與吸附位向的研究 Thermal Chemistry and Adsorption Orientation of 3-Chloro-1-propanol on Ni(111) |
| 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: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 80 |
| 中文關鍵詞: | 氯丙醇 、鎳 、超高真空 、表面 |
| 外文關鍵詞: | chloro, propanol, ni, 111, surface, Ni(111), 3-chloro-1-propanol |
| 相關次數: | 點閱:61 下載:1 |
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本篇論文是以程序控溫反應/脱附(temperature- programmed reaction/desorption, TPR/D)和反射吸收紅外光譜(reflection absorption infrared spectroscopy, RAIRS)探討超高真空系統中,ClCH2CH2CH2OH 在乾淨和預先覆氧的Ni(111)表面上的熱化學和反應中間物。ClCH2CH2CH2OH在Ni(111)表面低於197 K時發生O -H和C-Cl斷鍵,分別產生-OCH2CH2CH2Cl和-CH2CH2CH2OH表面中間物,但也有少部分的ClCH2CH2CH2OH並未發生O-H或C-Cl斷鍵,而是在低於200 K時直接脫水產生ClCH2CHCH2。3-Hydroxypropyl中間物在150~220 K經由複雜的反應產生C2H4、CH3OH和CO。另一方面,3-Chloropropoxide中間物在230~300 K時持續分解,300 K以上則完全分解。除了CO和H2以外並沒有在300 K以上發現其他產物。ClCH2CH2CH2OH/O/Ni(111)的TPR/D結果中,曝露量0.48 ML以下的反應產物與ClCH2CH2CH2OH/Ni(111)的實驗結果相近,然而我們在0.6~1 ML時則分別在178 K和346 K有發現CH3CHCH2和CH3CH2CHO脫附。由IR結果可推測CH3CH2CHO可能來自於300 K附近表面的Oxametallacycle(-CH2CH2CH2O-)中間物。
Temperature-programmed reaction/desorption (TPR/D) and reflection absorption infrared spectroscopy (RAIRS) have been employed to investigate the thermal reactions and surface intermediates of ClCH2CH2CH2OH on clean and oxygen-precovered Ni(111) in an ultra-high vacuum system. On Ni(111), -OCH2CH2CH2Cl and -CH2CH2CH2OH surface intermediates are formed from the scission of O-H and C-Cl bonds of ClCH2CH2CH2OH below 197 K, but some ClCH2CH2CH2OH dehydrated to form ClCH2CHCH2 below 200 K instead of breaking O-H or C-Cl bonds. 3-Hydroxypropyl intermediate decomposed and evolved into C2H4, CH3OH, and CO via complex reactions between 150 and 220 K. On the other hand, 3-Chloropropoxide intermediate continually decomposed between 230 and 300 K and dissociated completely above 300 K. No other product was found except for H2 and CO above 300 K. On oxygen-precovered Ni(111), TPR/D and IR experiment results at lower exposure(≦0.48 ML) are similar to ClCH2CH2CH2OH/Ni(111) case. However, we discovered that CH3CHCH2 and CH3CH2CHO evolved at 178 K and 346 K respectively between 0.6~1 ML on oxygen-precovered Ni(111). CH3CH2CHO may formed from oxametallacycle(-CH2CH2CH2O-) intermediate generated around 300 K by RAIRS studies.
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