Shaped, bonded boride catalysts - used for liquid phase epoxidation of olefins

摘要

A novel shaped catalyst material having improved crush strength for catalysing the liq. phase epoxidation of a 2-60 C olefin with an organic hydroperoxide consists of 80-95 wt. % finely divided particles of tungsten boride bonded by 5-20 wt. % of preoxidised aluminium powder having an oxide coating constituting 5-10 vol. % of the powder. Pref. the catalyst is formed into pellets and heated in an inert atmos. at 475-570 degrees C. The Al powder is preoxidised by exposure to moist air at 200-250 degrees F until the wt. has increased by 5-10%.