Abstract
As the ketone (cyclohexanone, 4-heptanone) concentration in cyclohexane was increased, the hydrogenation rate saturated even below 0.05 mol dm−3 on Ru and Pt, but at a much higher concentration of around 0.5 mol dm−3 on Pd. This result suggests that ketone adsorption on Pd is weak in comparison with other platinum group metals.