This work describes selective H 2 O 2 hydrogenation in the exit stream of the epoxidation reactor employed in the Hydrogen Peroxide–Propylene Oxide (HPPO) process. Pd/Al 2 O 3 and Pt/Al 2 O 3 catalysts were employed for this purpose. The effect of the reaction temperature, catalyst amount and hydrogen partial pressure on catalyst performance were investigated. It was found that the Pt catalyst is much more active than its Pd counterpart. Under optimized reaction conditions, the hydrogen peroxide present in the exit stream can be completely hydrogenated with the Pt catalyst with a reaction time of no longer than 20min and an almost negligible amount of byproducts derived from propylene oxide.