A FOURIER-TRANSFORM INFRARED SPECTROSCOPIC STUDY OF THE ADSORBED SPECIES FROM PERDEUTEROETHENE ON A DEUTERIUM-EXCHANGED PT-ON-SILICA CATALYST

Fourier-transform infrared spectroscopy has been applied to study the adsorption and deuteration of perdeuteroethene (C2D4) at 298 K on a de uterium-exchanged Pt/SiO2 catalyst. The spectra show absorptions assoc iated with pi- and di-sigma-bonded (C2D4) and with (CCD3), and a trace of (CCD2H), ethylidyne surface species. These were identified by comp arison with the closely-corresponding pattern of absorptions from the adsorption of C2H4. They are also correlated with previous spectroscop ic results from C2D4 adsorption on Pt single-crystals and from analogo us ligands in organometallic compounds. Deuteration of the initially-a dsorbed species gives only gas-phase C2D6 and a trace of C2D5H.