Highly stable Sr and Na co-decorated Fe catalyst for high-valued olefin synthesis from CO2 hydrogenation

Direct catalytic hydrogenation of CO 2 is a highly promising route for olefin synthesis. However, achieving high olefin selectivity is predicated on the development of a selective catalyst with acceptable yield and stability. Herein, we report a Sr and Na co-decorated Fe catalyst that showed stable performance in the synthesis of high-valued olefins (ethene, propene and linear α-olefins) with space-time yield up to 290 mg g cat −1 h −1 without significant deactivation for over 500 h on-stream. The excellent catalytic performance is attributed to the cooperative effect of Sr and Na on the distinct sites (Fe 5 C 2 , Fe 3 C, Fe 3 O 4 ) in catalyst. In particular, SrCO 3 promoted the dispersion of binding Fe sites that facilitated the formation and stabilization of FeC x phase. Simultaneously, Sr contributed to the electron interaction between Na and Fe species. The dual effect of Sr as both structural and electronic promoters coordinatively improved C–O dissociative adsorption and subsequent C–C coupling, thus facilitated CO 2 hydrogenation. • Sr and Na co-decorated Fe catalyst showed excellent stability over500 h on-stream. • NaSrFe catalyst achieved high-valued olefin synthesis with yield up to 23.3 %. • SrCO 3 facilitated the formation, dispersion and stabilization of FeC x phase. • Sr species contributed to the electron interaction between Na and Fe species.