Effect of catalyst preparation and storage on chemical looping epoxidation of ethylene

Chemical looping epoxidation (CLE) of ethylene to oxide (EO) presents an exciting alternative the incumbent technology direct with O2(g). In CLE, reaction is still catalysed by Ag but oxygen provided as Olattice from a solid metal oxide, eliminating need and limitations using Here, influence catalyst preparation in CLE investigated. The was impregnated on SrFeO3, which used donor CLE. Temperature programmed reduction H2 indicated that O-species participating can be attributed removal first monolayer SrFeO3. By changing temperature calcination Ag-SrFeO3 preparation, size particles varied, resulting simultaneous increase selectivity for EO (up 60%) conversion C2H4 10%). Then, assessment effects impurities (carbonates, hydroxides), deposit over time surface, performed, showing deteriorate performance Finally, doping SrFeO3 Ce A-site perovskite carried out, substantial improvement achieved, reaching 15%, while maintaining 60% EO.