Direct conversion of CO2 to ethylene by bifunctional ZnCr2O4-ZSM-22 catalyst

Although direct catalytic conversion of CO2 to light olefins has attracted wide attention, oriented synthesis of single ethylene from CO2 is still a challenge. In this work, an efficient bifunctional ZnCr2O4-ZSM-22 catalyst was developed for the direct conversion of CO2 to ethylene. This catalyst exhibited 24.0% ethylene selectivity and 21.9% CO2 conversion by one-pass. It is worth noting that the ratio of ethylene/light olefin (C-mol ratio) was more than 93%, higher than those of other zeolites. Moreover, the ZnCr2O4-ZSM-22 catalyst realized superior stability, where there was no significant deactivation during 60 h. In addition, the effects of various factors on the catalytic performances were also systematically investigated. This bifunctional ZnCr2O4-ZSM-22 catalyst opens a new avenue for direct conversion of CO2 to ethylene.