Thermal Chemistry of Propanoyl Chloride on Cu(100) and O/Cu(100)

Abstract

Thermal chemistry of propanoyl chloride (CH3CH2COCl) on Cu(100) and O/Cu(100) was studied using temperature-programmed reaction/desorption (TPR/D) reflection-absorption infrared spectroscopy (RAIRS) and X-ray photoelectron spectroscopy At 160 K the RAIRS and XPS results show that a large portion of the adsorbed CH3CH2COCl molecules undergo C–Cl bond cleavage resulting in the formation of CH3CH2CO(ad) on Cu(100) Hexane-3 4-dione and 3-hexyne are found to be desorbed at 230 K and 310 K respectively The formation of 3-hexyne is related to C–O cleavage of CH3CH2CO and the remaining CH3CH2CO(ad) can combine with the oxygen from the C–O cleavage to generate propanoate (CH3CH2COO) The CH3CH2COO decomposes into H2 CO and CO2 at ~600 K On O/Cu(100) CH3CH2COCl reacts with preadsorbed O to form CH3CH2COO(ad) at ~160 K The CH3CH2COO(ad) further reacts at ~480 K to form H2 H2O CO CO2 and CH3CH2COOH Some surviving CH3CH2COO groups and its dissociation fragments continue to react at ~550 K producing H2 CO CO2 and H2C=C=O

Date of Award	2020
Original language	English
Supervisor	Jong-Liang Lin (Supervisor)