FT-IR Emission Spectra of Chemisorbed Species, with Application to Species Adsorbed on Alumina

The principles of infrared emission spectroscopy are briefly reviewed with emphasis on the aspects of its application to the study of chemisorbed species. The ma in problems of sample preparation, selection of measurement conditions and the most suitable methods of data treatment are discussed. IR emittance spectra of two typical support materials for supported metal catalysts, aJumina and silica, are presented. On the examp1e of a rhenium complex, tetrakisttricarbonyl-us-hydroxo-rhenium), formed on alumina support in catalytic amounts (1.5 to 5% Re) it is shown that the four-measurement technique can .Iead to observation of the adsorbate bands also in the regions of high substrate emission (between 1300 and 400 cm-I).