Chemisorptive properties of platinum supported on zeolite Y studied by infrared emission spectroscopy

IR emission spectra obtained with a Fourier transform spectrometer at 110/sup 0/C revealed that pyridine adsorbed on platinum Y zeolite by coordination to the Na ion and by formation of pyridinium ions with bands at 755 and 685 cm/sup -//sup 1/; the formation of pyridinium ions suggested the presence of acidic OH groups formed during platinum reduction with hydrogen. Bands observed at 465 and 2070 cm/sup -//sup 1/ in the spectra of adsorbed carbon monoxide were attributed to linearly adsorbed species, and a band at 1850 cm/sup -//sup 1/ to carbon monoxide bonded to two platinum atoms. The experimental technique and its scope are discussed.