Adsorption and Decomposition of Monoethanolamine on Cu(100)

作者：Lin Yi Shiue^*; Lin Jain Shiun; Wang Ching Yung; Kuo Che Wei; Lin Jong Liang

来源：Journal of Physical Chemistry C, 2009, 113(10): 4147-4154.

DOI：10.1021/jp8095117

Temperature-programmed reaction/desorption and reflection-absorption infrared spectroscopy have been employed to investigate the adsorption and decomposition of HOCH(2)CH(2)NH(2) on Cu(100). HOCH(2)CH(2)NH(2) molecules desorb from the multilayer and monolayer with a maximum rate at 203 and 255 K, respectively. The desorption state at 255 K corresponds to an adsorption energy of 66.0 kJ.mol(-1) calculated for a first-order kinetics with a preexponential factor of 10(13) s(-1). RATRS suggests that the multilayer and monolayer may be composed of different HOCH(2)CH(2)NH(2) rotational isomers. HOCH(2)CH(2)NH(2) can also decompose on Cu(100), approximately at the same temperature range of monolayer desorption, mainly to evolve H(2) and H(2)O at similar to 400 K. An Ar( )-sputtered Cu(100) surface is found to promote the dissociation of HOCH(2)CH(2)NH(2). Temperature-dependent RAIRS, with the assistance of theoretical calculations based on density-functional theory, strongly suggests that HOCH(2)CH(2)NH(2) on Cu(100) dissociates first by losing a hydrogen atom to form -OCH(2)CH(2)NH(2), followed by transformation into HOCH(2)CH(2)N=. Decomposition of the latter species is responsible for the desorption of H(2) and H(2)O.

• 出版日期2009-3-12