| Summary: | 碩士 === 國立成功大學 === 化學系碩博士班 === 100 === The adsorption and thermal reactions of 2-butynoic acid on Cu(100) and oxygen-precovered Cu(100) have been studied in ultra-high vacuum system by using the surface techniques of temperature-programmed reaction/desorption (TPR/D), reflection-absorption infrared spectroscopy (RAIRS) and Auger electron spectroscopy (AES).
Thermal decomposition of 0.5 L CH3C≡CCOOH on Cu(100) causes the desorption of H2O(215 K), H2(340 K, 510 K), CO(340 K), CO2 (340 K) and CH3C≡CH(340 K, 490 K). RAIRS shows the formation CH3C≡CCOO(a) at 275 K. The possibility for the formation of reaction intermediate, CH3C≡CCO(a), due to the H2O desorption at 215 K, possible from OH(a), cannot be ruled out. In the case of 0.5 L CH3C≡CCOOH/O/Cu(100), the reaction products are H2O(180 K, 280 K, 370 K), H2 (280 K), CO(280 K), CO2 (280 K). There is evidence for the CH3C≡CCOO(a) generation at 110 K. Reaction of CH3C≡CCOO(a) with pre-adsorbed O (possibly involving CH3) decrease its thermal stability on Cu(100).
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