Promotional Effect of ZrO2 on supported FeCoK Catalysts for Ethylene Synthesis from catalytic CO2 hydrogenation

This study is to convert renewable H 2 and increasingly concerned CO 2 to ethylene or C 2 H 4 over Fe 3.33 Co 1.67 K 5 /ZrO 2 and Fe 3.33 Co 1.67 K 5 /Al 2 O 3 catalysts. The ZrO 2 support provides amounts of surface oxygen vacancies (OVs) as well as stable and rich surface hydroxyl groups (-OH), which promotes the Fe 3.33 Co 1.67 K 5 /ZrO 2 catalysts with 5% Fe and Co loadings to achieve C 2 H 4 space time yield (STY) of 0.064 mmol C2H4 ∙m −2 cat ∙h −1 at 290 °C and 2.0 MPa, while the Fe 3.33 Co 1.67 K 5 /Al 2 O 3 catalysts only reach C 2 H 4 STY of 0.009 mmol C2H4 ∙m −2 cat ∙h −1 at 330 °C and 2 MPa Fe 3.33 Co 1.67 K 5 /ZrO 2 catalysts are very promising for converting the captured CO 2 and renewable H 2 to highly demanded C 2 H 4 . This work not only provides a guideline for developing efficient catalysts but also advances the mechanistic understanding of catalytic CO 2 hydrogenation.