Thermal Chemistry and Adsorption Orientation of 2-Fluoroethanol on Ni(111)

• Main Authors: Shu-TuiTsao, 曹書睿
• Other Authors: Jong-Liang Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/34483806790705080295

碩士 === 國立成功大學 === 化學系碩博士班 === 98 === Temperature-programmed reaction/desorption (TPR/D) and reflection absorption infrared spectroscopy (RAIRS) have been employed to investigate the adsorption geometry and thermal reactions of FCH2CH2OH on bare and oxygen-preadsorbed Ni(111) in an ultra-high vacuum system. The C-F and O-H bonds of FCH2CH2OH dissociate on Ni(111) in the temperature range ~180-200 K, forming -CH2CH2O- . This oxametallacycle is stable at 280 K, however it decomposes to form CO2 and H2 at higher temperature. On oxygen-precovered Ni(111), FCH2CH2OH decomposes to form acetaldehyde and CO2 in addition to H2 and CO. The relative yields of these products increase and then decrease with increasing the exposure. FCH2CH2OH on O/Ni(111) starts to decompose at ~170 K by OH-bond scission, generating FCH2CH2O- , which exists stably at 280 K. When the temperature is raised higher than 300 K, this intermediate transforms to the oxametallacycle (-CH2CH2O-).