摘要
应用高分辨电子能量损失谱 (HREEL S)和热脱附谱 (TDS) ,研究了 Mn薄膜 / Rh(10 0 )上乙醇的吸附和分解 ,提出了表面吸附和分解的反应模式 .在 30 0 K时 ,蒸镀的 Mn在清洁 Rh(10 0 )表面上以层层模式生长 ;在130～ 30 0 K间 ,在 2 5 m L Mn/ Rh(10 0 )表面上吸附 2 0 L乙醇的 TDS结果与乙醇在 Rh(10 0 )表面上的结果一致 .在 15 5 K处 ,脱附出多层凝聚态吸附的乙醇 ;升温到 2 5 5 K,脱附出 H2 和 CH4.继续升温 ,出现了与乙醇在Rh(10 0 )表面上不一致的现象 .在 470 K ,同时出现了第 2个 H2 和 CH4的脱附峰 ;在 5 0 0 K,脱附极少量的 CO;在 95 0 K附近 ,脱附出大量
Adsorption and decomposition of ethanol on the film of Mn/Rh(100) have been studied by high\|resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). At 300 K, the trends of the Mn deposited on clean Rh(100) surface are in good consistence with a model of layer\|by\|layer growth. Between 130 and 300 K, the TDS results of the exposure of 20 L ethanol on \{Rh(100)\} surface with deposited 25 mL Mn films are the same as those of the exposure of 20 L ethanol on clean Rh(100) surface. The ethanol multilayers on the Mn films are desorbed at 155 K, and when the temperature increased to 255 K, the desorption of H\-2 and CH\-4 adsorbed on the Mn films occurs. Upon heating, some differences of the results of 20 L ethanol on clean Rh(100) surface appear. At 470 K, the desorption peaks of H\-2 and CH\-4 appear again and the temperatures of desorption are also the same. Comparing with the desorption peaks of CO at about 900 K, the desorption peaks of CO at 500 K are rather small.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2001年第3期187-190,共4页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金委
中国科学院资助课题 (批准号 :2 98730 48
2 97730 47)
关键词
乙醇
吸附
高分辨电子能量损失谱
热脱附谱
分解
一氧化碳
锰薄膜
铑催化剂
Ethanol adsorption
Mn films
Rh(100) surface
High Resolution Electron Energy Loss Spectroscopy
Thermal Desorption Spectroscopy
