Abstract

Acquisition of adsorbate spectra under transient conditions at moderate temperatures and pressures with catalytic solids which adsorb strongly at IR wavelengths requires a carefully conceived cell design. A temperature-controlled, heated block cell with a built-in preheating coil, designed to permit <i>in situ</i> pressing of the catalyst wafers, was designed and built to meet these requirements. Measurements of CO oxidation on a CuO/silica catalyst employing step changes of O₂ and CO partial pressures were conducted with the cell mounted in a Bomem FT-IR spectrophotometer, Model DA3.02. A time resolution of about 10 s was achieved with the use of a wafer of millimeter dimension, atmospheric pressure, and temperatures up to 260°C. Significant quantities of un-reactive CO were found on the CuO surface.

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