研究生: |
吳凱煜 |
---|---|
論文名稱: |
烷基碘在Pt(111)表面上的吸附行為及熱分解反應 |
指導教授: | 洪偉修 |
學位類別: |
碩士 Master |
系所名稱: |
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: | 85 |
中文關鍵詞: | TPD 、XPS 、Pt 、alkyl iodide 、adsorption |
論文種類: | 學術論文 |
相關次數: | 點閱:154 下載:0 |
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在超高真空下,探討烷基碘( alkyl iodide,R-I )化合物在Pt(111)表面的吸附及熱分解反應。以程溫脫附法( temperature-programmed desorption,TPD )偵測脫附產物。並以同步輻射光為光源的X-ray光電子能譜( X-ray photoelectron spectroscopy,XPS )分析升溫過程中吸附物的化學組態變化。綜合TPD與XPS的數據,提出烷基碘在鉑表面的反應及分解機制。
低覆蓋率的條件下,所有化學吸附的烷基碘分子在低於200K的溫度會分解成烷基與碘原子,烷基會進行脫氫反應,氫原子結合以分子形式脫附,留下殘碳於表面。在較高的覆蓋率之下,隨著溫度逐步升高,物理吸附的烷基碘會先脫附出來,接著化學吸附的烷基碘則是斷裂C-I鍵,生成烷基與碘原子,烷基除了與氫原子鍵結,還原生成烷類脫附;具有β-H的烷基會以β-hydride elimination生成烯類,以di-σ bonding的方式鍵結在表面,有一部分烯類脫附離開表面。在更高的溫度下,烯類會再進行脫氫反應,一連串的去氫反應後,氫原子在400~500K結合產生氫分子脫附,最後留下殘碳於表面。
比較不同級數烷基的反應結果,得知三級與二級烷基因為立體障礙的因素,氫原子較不易與烷基鍵結,所以烯類與烷類的比例相差較大。
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