甲醇在以thita-三氧化二鋁/鎳鋁合金為基板之奈米黃金粒子上的分解反應-以熱脫附質譜術與傅立葉紅外光譜儀方法之研究

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姓名

胡國睿(Guo-ruei Hu) 查詢紙本館藏

畢業系所

物理學系

論文名稱

甲醇在以thita-三氧化二鋁/鎳鋁合金為基板之奈米黃金粒子上的分解反應-以熱脫附質譜術與傅立葉紅外光譜儀方法之研究
(Methanol decomposition on Al2O3/NiAl(100) supported Au nanoclusters:A combined FTIR and TPD study)

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摘要(中)

我們研究的主題是甲醇在黃金奈米粒子觸媒模型系統上的分解反應。利用熱脫質譜術與反射式傅立葉紅外線光譜儀來進行實驗。實驗流程中，θ相的三氧化二鋁在真空的環境之下成長在鎳鋁合金(100)面之上。此一觸媒模型系統在我們先前的研究之中已經被我們用掃描穿隧式電子顯微鏡檢查過黃金奈米粒子在表面上的成長模式與大小分佈情形。在氧化鋁表面上，甲醇會以兩種不同的型態吸附的現象由熱脫附質譜數以及反射式紅外光譜儀之中觀察到。在有鍍金的情況下，甲醇單層的吸附特徵隨著黃金覆蓋率增加而慢慢的減少。我們從甲醇吸附在1 ML之黃金奈米粒子上的熱脫附實驗中觀測到一個一氧化碳的脫附特徵，同時在甲醇吸附在氧化鋁表面及高黃金覆蓋率的表面上則觀察不到相同的一氧化碳的脫附特徵。此一現象顯示了甲醇在特定覆蓋率的黃金奈米粒子上才會有分解的反應。在同一樣品上相對應的紅外線光譜儀的訊號，偵測到顯著的分子型態的一氧化碳的光譜訊號。此一結果與熱脫附質譜術所得的結論相同。兩個不同的分子型態的一氧化碳光譜訊號在100K時在表面曝滿飽和的甲醇曝量時被檢測到。原來在2050 cm-1的一氧化碳光譜特徵訊號在加溫到200K的時候發生一個顯著的偏移到2100 cm-1。熱脫附質譜術與反射式傅立葉紅外光譜儀都顯示出在1 ML的時候是甲醇分解效率最大的時候。在高溫的情況下鍍黃金所成長出的奈米粒子顯示出反應能力下降的現象。

摘要(英)

We have studied the adsorption and decomposition of methanol on a well-defined Au model catalyst, utilizing a combination of reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD). The Au model catalyst is prepared under ultrahigh vacuum (UHV) conditions on a well-ordered θ-Al2O3 film grown on NiAl(100). This model system has been characterized by scanning tunneling microscopy (STM) with respect to the growth mode and the size distribution. On Al2O3 support, two desorption states are distinguishable by the TPD and RAIRS. The monolayer desorption feature from Al2O3 is replaced by monolayer feature on gold when Au coverage increases. A CO desorption feature at 350 K is observed on 1 ML Au clusters, while the same feature is not detected on Al2O3 subtract or 6 ML Au clusters. The corresponding IR spectra of 1 ML Au clusters show strong ν(CO) intensity, which indicates the same behavior. This implies that methanol decompose on specific Au coverage. Two CO adsorption states are observed by IR at saturated methanol exposure at 100 K on 1 ML Au clusters. The ν(CO) at 2050 cm-1 shifts drastically to 2100 cm-1 when annealed to 200 K. Both TPD and RAIRS results show that 1 ML Au cluster is the most productive in decomposing CO. Both the annealed and the high temperature deposited clusters show decreasing reactivity.

關鍵字(中)

★ 熱脫附
★ 紅外光譜儀
★ 催化
★ 分解
★ 甲醇

關鍵字(英)

★ methanol
★ decomposition
★ model catalyst
★ TPD
★ FTIR

論文目次

Chapter 1 Introduction......................................... 1
Reference Chapter 1 .......................................................................................... 3
Chapter 2 Literature Survey ....................................................................................... 4
2.1 Methanol decomposition on single crystals .................................................. 4
2.2 Extraordinary properties of nanoclusters .................................................... 13
2.3 Supplement ................................................................................................ 24
Reference Chapter 2 ........................................................................................ 29
Chapter 3 Experimental Apparatus and Methods...................................................... 31
3.1 Overview ................................................................................................... 31
3.2 Ultrahigh Vacuum Chamber and Vacuum pumps ........................................ 33
3.3 Sample Cleaning instruments ..................................................................... 36
3.4 Cleanliness and ordering examination ........................................................ 39
3.6. Fourier-Transform Infrared Spectroscopy Integration ................................ 43
3.7 Temperature Programmed Desorption Integration ...................................... 48
3.8 Experiment Methods .................................................................................. 60
Reference Chapter 3 ........................................................................................ 66
Chapter 4 Results and Discussion ............................................................................ 67
4.1 Structure of the Au/Al2O3/NiAl(100) model catalyst .................................. 67
4.2 Methanol adsorption on Al2O3/NiAl(100)................................................... 67
4.3 Methanol adsorption on Au/Al2O3/NiAl(100) ............................................. 71
4.4 Methanol decomposition on Au/Al2O3/NiAl(100) ...................................... 75
4.4.1 Coverage dependence of decomposition reaction ............................. 75
4.4.2 Temperature dependence of the methanol decomposition ................. 81
4.4.3 Coverage dependence CO production and the cluster site variation .. 88
Reference Chapter 4 ................................................................................. 93
Chapter 5 Summary ................................................................................................. 96

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指導教授

羅夢凡(Meng-fan Luo)

審核日期

2009-10-23

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