Abstract
The adsorption of CO and hydrogen was studied over Ru/Al 2O 3 catalysts derived from RuCl 3·3H 2O reduced at temperatures of up to 1000 K. When the reduction was carried out at 600 K, large amounts of chloride remained on the catalyst surface. This chloride was partitioned between the support and the metal. This residual chloride was observed to inhibit both CO and hydrogen chemisorption. Hydrogen adsorption was inhibited to a greater extent than CO adsorption due to a dual site adsorption requirement. Both hydrogen and CO chemisorption were observed to increase when the reduction temperature was increased. The chloride could be quantitatively removed by washing the catalyst with a dilute solution of ammonia. Reduction temperatures in excess of 900 K were required to completely remove the chloride from the catalyst.
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