Vibrational spectra and thermal decomposition of methylamine and ethylamine on Ni(111)
Journal Article
·
· Journal of Physical Chemistry
- Lawrence Berkeley Lab., CA (United States)
The bonding and geometry of methylamine (CH{sub 3}NH{sub 2}) and ethylamine (CH{sub 3}CH{sub 2}NH{sub 2}) on Ni(111) have been investigated with high-resolution electron energy loss vibrational spectroscopy (HREELS). Both amines adsorb molecularly at 150 K through the nitrogen lone pair. Significant metal-hydrogen interactions in the alkyl chain were indicated by {open_quotes}softened{close_quotes} C-H stretching modes with frequencies shifted to 2660-2680 cm{sup {minus}1}. Temperature-programmed desorption (TPD) and HREELS were used to monitor their desorption and thermal decomposition on the Ni(111) surface. Both CH{sub 3}NH{sub 2} and CH{sub 3}CH{sub 2}NH{sub 2} are dehydrogenated in the temperature range 300-400 K. CH{sub 3}NH{sub 2} is dehydrogenated to HCN at about 330 K, which further decomposes above 360 K. CH{sub 3}CH{sub 2}NH{sub 2} is dehydrogenated to CH{sub 3}CN, initially by {alpha}-C-H bond scission, leading to desorption of that molecule at 350 K. On the basis of their spectra, the authors propose a mechanism for the dehydrogenation processes of CH{sub 3}NH{sub 2} and CH{sub 3}CH{sub 2}NH{sub 2} on Ni (111). 33 refs., 13 figs., 3 tabs.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 563418
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 23 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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