Thermal and electron-induced decomposition of 2-butanol on Pt(111).
The adsorption, thermal evolution, and electron irradiation of 2-butanol on Pt(111) were investigated with reflection absorption infrared spectroscopy (RAIRS). A simulated vibrational spectrum of a single 2-butanol molecule was calculated using density functional theory to facilitate vibrational assignments. Exposures of 0.2 Langmuir (L) and lower result in both isolated 2-butanol molecules with minimal lateral interactions and hydrogen-bonded clusters. The thermal evolution following a 4.0 L exposure shows that the hydrogen-bonded multilayer desorbs around 170 K, leaving a 2-butanol monolayer where hydrogen bonding still exists. At 190 K, a new feature at 1699 cm(-1) is attributed to the formation of butanone. Irradiation with 750 or 100 eV electrons leads to 2-butanol desorption and partial conversion to butanone, as indicated by the appearance of a peak at 1709 cm(-1).
Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
Xiaofeng
X
Hu
Richard A
RA
Rosenberg
Michael
M
Trenary
D000327:Adsorption; D000440:Butanols / Q000737:chemistry*; D004583:Electrons; D006860:Hydrogen Bonding; D010984:Platinum / Q000737:chemistry*; D011789:Quantum Theory; D013055:Spectrophotometry, Infrared; D013696:Temperature; D014732:Vibration
D000440:Butanols; C043958:2-butanol; D010984:Platinum