Abstract
A cell and optical configuration for measuring diffuse reflectance Fourier transform infrared spectra of adsorbed species at high sensitivity are described. The cell may be heated to 600 °C and evacuated to 10 −6 torr, permitting activation and treatment of catalysts and adsorbents in situ. It is shown that it is important to prevent radiation emitted from the material surrounding the sample from reaching the mercury cadmium telluride detector, or else the detector will be saturated at relatively low sample temperatures. Gases can be drawn through the samples to reduce the time taken for equilibrium to be reached. Spectra of carbon monoxide adsorbed at about 0.1% coverage on supported metal catalysts can be measured with high signal-to-noise ratio.
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