Adsorption of acrolein and its hydrogenation products on Cu(111)

• DOI: 10.1039/d2cp03817j
• Publication Date: 2022-09-26T15:41:45Z
• Authors: Arephin Islam; David L. Molina; Michael Trenary
• Keywords: Acrolein; Thermal desorption spectroscopy; Propanol

The adsorption of acrolein and its hydrogenation products propanal, 1-propanol, 2-propenol on Cu(111) was studied by reflection absorption infrared spectroscopy (RAIRS) temperature-programmed desorption (TPD). experimental RAIR spectra were obtained adsorbing multilayers each molecule at 85 K then annealing the surface up to 200 desorb multilayer produce most stable monolayer structure surface. Each four molecules adsorbs weakly desorbs temperatures below 225 K. Compared two alcohols, have notably higher broadened redshifted O-H stretches that reveal strong hydrogen bonding in multilayers. Upon 160 K, OH both 1-propanol disappear, indicating is not present monolayers. For 2-propenol, correlates with observation CC stretch 1647 cm-1, which invisible for monolayer. This suggests bond parallel coverages 2-propenol. Similarly, CO peak 1735 cm-1 compared those 1671 1695 very weak low but becomes prominent multilayer, a change molecular orientation. acrolein, out-of-plane bending modes are more intense than submonolayer coverages, plane mainly In contrast, opposite intensity trend observed suggesting bonds tilted away from