| CH3（ad）在清洁及预吸附氧Pd（100）表面的热脱附性能 |
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| 引用本文： | 苏彩丽,魏绪明.CH3（ad）在清洁及预吸附氧Pd（100）表面的热脱附性能[J].分子催化,1997,11(1):21-26. |
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| 作者姓名： | 苏彩丽 魏绪明 |
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| 作者单位： | [1]中国科学院兰州化学物理研究所 [2]中国科学院大连化学物理研究所催化基础国家重点实验室 |
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| 摘 要： | 用高分辨电子能量损失谱，热脱附谱，紫外光电子能谱研究了ＣＨ３在清洁及预吸附氧Ｐｄ表面上的热稳定性。ＣＨ３由ＣＨ３Ｉ在Ｐｄ表面的热分解来产生。ＣＨ３Ｉ的ＨＲＥＥＬＳ表明，ＣＨ３中的Ｃ－Ｈ键近似与表面平行，ＣＨ３Ｉ在Ｐｄ表面低于１１０Ｋ时已裂解为ＣＨ３和Ｉ，大量的ＣＨ３在２００－２１０Ｋ的温度范围内的Ｈ结合并以ＣＨ４的形式脱附，但在氧改性表面，ＣＨ４脱附的温度范围变宽，脱附温度有所提高，可能是由于表面
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| 关 键 词： | 吸附 脱附 热稳定性 钯 结构 氢化碳 吸附剂 |
Thermal Desorption Spectrometry of CH 3 (ad) on Clean and Oxygen Preadsorbed Pd(100) |
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| SU Caili,QU Zhaojun,DING Xuejia,SHEN Shikong.Thermal Desorption Spectrometry of CH 3 (ad) on Clean and Oxygen Preadsorbed Pd(100)[J].Journal of Molecular Catalysis (China),1997,11(1):21-26. |
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| Authors: | SU Caili QU Zhaojun DING Xuejia SHEN Shikong |
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| Institution: | SU Caili QU Zhaojun DING Xuejia SHEN Shikong (Lanzhou Institute of Chemical Physics The Chinese Academy of Sciences Lanzhou 730000 |
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| Abstract: | The thermal decomposition of CH 3I on clean and oxygen preadsorbed Pd(100) has been studied using high resolution electron energy loss spectroscopy(HREELS), ultraviolet photoelectron spectroscopy(UPS) and thermal desorption spectroscopy(TDS) at 110-500 K. The very weak C-H bond vibrational spectra of CH 3I implies that the C-H bond is almost parallel to the surface. It is observed that CH 3I decomposes to CH 3 (ad) and I(ad) below 110 K, CH 3 (ad) reacts with H(ad) and desorbs from the surface at 200-210 K. The desorption temperature of CH 3 (ad) on the oxygen preadsorbed surface is a little higher (up to 250 K) than that on clean surface. It indicates that the thermal stability of CH 3 (ad) is enhanced by the preadsorbed oxygen. Maybe, it is due to the blocking effects of preadsorbed oxygen and the reaction between O(ad) and H(ad). |
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| Keywords: | CH 3I HREELS TDS UPS Thermal stability Adsorption and desorption CH 3 - Pd |
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