Chemisorption measurements on polymer‐stabilized colloidal platinum and rhodium nanoclusters in liquid dispersion

A simple method is reported for the precise and accurate differential barometric measurement of gas adsorption into liquid dispersions of colloidal metal catalysts. Using both hydrogen adsorption and hydrogen/oxygen titration the fraction of the total surface of polyvinylpyrrolidone‐stabilised Pt and Rh colloids available for adsorption is found to be approximately 44%. This method is also applicable to supported metal catalysts in liquid slurries.