CHEMISORPTION OF CARBON MONOXIDE ON METAL SURFACES BY PULSE CHROMATOGRAPHY

A pulse chromatographic procedure has been developed for the measurement of the surface areas of catalytic metals by carbon monoxide chemisorption. This procedure consists of repeated injection of carbon monoxide pulses into a helium carrier gas passed over the metal surface to establish the cumulative saturation value which corresponds to irreversible chemisorption. Independent measurements made on unsupported platinum and nickel metal powders with volumetric and chromatographic surface area procedures and on supported nickel catalysts with a volumetric chemisorption procedure have established the validity of the pulse chromatographic procedure for determination of carbon monoxide chemisorption. Advantages of the pulse chromatographic procedure include the avoidance of high vacuum procedures and the avoidance of corrections for reversible physical adsorption. © 1969, American Chemical Society. All rights reserved.