Stabilizing Co₂C with H₂O and K promoter for CO₂ hydrogenation to C₂₊ hydrocarbons.

ABSTRACT: The decomposition of cobalt carbide (Co₂C) to metallic cobalt in CO₂ hydrogenation results in a notable drop in the selectivity of valued C₂₊ products, and the stabilization of Co₂C remains a grand challenge. Here, we report an in situ synthesized K-Co₂C catalyst, and the selectivity of C₂₊ hydrocarbons in CO₂ hydrogenation achieves 67.3% at 300°C, 3.0 MPa. Experimental and theoretical results elucidate that CoO transforms to Co₂C in the reaction, while the stabilization of Co₂C is dependent on the reaction atmosphere and the K promoter. During the carburization, the K promoter and H₂O jointly assist in the formation of surface C^* species via the carboxylate intermediate

SUBMITTER: Wang M 

PROVIDER: S-EPMC10275596 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature