Vibrational Spectroscopy Study of the Chemistry of Trimethylamine on Pt(111)
Abstract
Trimethylamine ((CH3)3N) is an important reagent for characterization of surface acidity and many industrial catalytic reactions. This report is the first attempt to characterize trimethylamine on Pt(111) surface using TPD and HREELS. From TPD, it is found that only H2, HCN and (CH3)3N desorb from the surface. (CH3)3N desorbs as a single peak at 250 deg C. The vibrational spectra at low temperature indicate that the molecule is weakly bonded to the surface through the nitrogen lone pair. Surface adsorbate species at different temperatures are identified with HREELS. Spectral changes at different sample temperature coincide with TDS spectra. CO and trimethylamine coadsorption experiments are also performed, which enables us to conclude that trimethylamine is adsorbed on top site. In addition, it is found that CO stretching frequencies are shifted as much as 40 cm-1 due to strong coadsorbates interaction. A possible reaction mechanism is proposed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1992
- Accession Number
- ADA251566
Entities
People
- John C. Hemminger
- Qixun Xu
- Wulf Erley
Organizations
- University of California, Irvine