Direct Catalytic Conversion of Carbon Dioxide to Liquid Hydrocarbons over Cobalt Catalyst Supported on Lanthanum(III) Ion‐Doped Cerium(IV) Oxide

Abstract Direct CO 2 conversion to liquid hydrocarbons (HCs) in a single process was achieved using cobalt (Co) catalysts supported on lanthanum ion (La 3+ )‐doped cerium oxide (CeO 2 ) under a gas stream of H 2 /CO 2 /N 2 =3/1/1. The yield of liquid HCs was the highest for 30 mol% of La 3+ ‐doped CeO 2 , which was because extrinsic oxygen vacancy formed by doping La 3+ could act as an effective reaction site for reverse water gas shift reaction. However, the excess La 3+ addition afforded surface covering lanthanum carbonates, resulting in depression of the catalytic performance. On the other hand, bare CeO 2 lead to an increase in the selectivity of undesirable methane, which arose from reduction of CO 2 to CO proceeding by intrinsic oxygen vacancy generated by only Ce 3+ , and weaker CO 2 capture ability of intrinsic oxygen vacancy than extrinsic one, resulting in the proceeding of Sabatier reaction on Co catalyst. The rational design of reaction sites presented in this study will contribute to sustainability.