Direct gas-phase epoxidation of hexafluoropropylene with molecular oxygen using Ag catalyst

A new potential Ag catalytic system for direct gas-phase epoxidation of hexafluoropropylene with molecular oxygen is reported. The practicability of epoxidation of hexafluoropropylene with molecular oxygen using Ag/γ-Al2O3 catalyst at low temperature and under ambient pressure is investigated. Modified the Ag catalyst by Cs, both the conversion of hexafluoropropylene and the selectivity to hexafluoropropylene oxide could be improved significantly. The catalysts were characterized by XRD, TEM and EDS.