Liquid-phase epoxidation of styrene with O2 over alkali metal salt impregnated CoAPO-5

Liquid-phase epoxidation of styrene with atmospheric O2 was conducted over CoAPO-5 molecular sieves. The catalytic performance of CoAPO-5 can be significantly improved by alkali metal salt impregnated on it, and styrene conversion and selectivity to styrene oxide reached 85% and 69% respectively when CsCl was impregnated on it. The catalyst was recyclable and exhibited similar catalytic activity and selectivity even after three catalytic reaction cycles.