Add time:08/25/2019 Source:sciencedirect.com
The adsorption and decomposition of trimethylamine on a Pt(111) surface have been investigated, using high resolution electron energy loss spectroscopy, Fourier transform infrared reflection—absorption spectroscopy and temperature-programmed desorption.Trimethylamine adsorbs molecularly at 85 K through the nitrogen lone pair on the Pt(111) surface. Upon heating, four steps of decomposition are observed, starting with sequential CN bond cleavage. Three different intermediate surface species can be identified by vibrational spectroscopy. Heating to 280 K generates a dimethylamino species, (CH3)2N. Further heating to 400 K causes the formation of a methylnitrene species, CH3N. This species dehydrogenates to a methylene amido species, CH2N around 450 K. Finally, complete dehydrogenation takes place at temperatures above 500 K.
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