臺灣博碩士論文加值系統

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。

目錄
中文摘要 Ⅰ
English abstract Ⅱ
目錄 Ⅳ
圖目 Ⅶ
表目 ⅩⅠ

第一章 序論 1
1.1 Pt-過渡金屬的特性 1
1.2 過渡金屬的催化反應 1
第二章 文獻回顧 5
2.1 碳氫碎片的產生方式 5
2.2 碳氫化合物的異相催化機制 8
第三章 實驗部分 15
3.1 實驗儀器 15
3.1.1 超高真空系統 15
3.1.2 實驗組件 16
3.2 表面分析技術 17
3.2.1 同步輻射X-ray光電子能譜 18
3.2.2 程序控溫脫附 24
3.3 實驗步驟 26
3.3.1 Pt(111)單晶的設置與表面清潔 27
3.3.2 藥品及其處理 28
第四章 烷基碘在Pt(111)面的吸附及熱分解 30
4.1 Methyl iodide在Pt(111)的吸附及反應 30
4.2 Ethyl iodide在Pt(111)的吸附及反應 45
4.3 Propyl iodide在Pt(111)的吸附及反應 56
4.4 Iso-propyl iodide在Pt(111)的吸附及反應 65
4.5 Tert-butyl iodide在Pt(111)的吸附及反應 75
4.6 結論 82
第五章 參考文獻 85

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