Efficient Reduction of CO2 to CO Using Cobalt-Cobalt Oxide Core-Shell Catalysts

Guoheng Yin; Xiaotao Yuan; Xianlong Du; Wei Zhao; Qingyuan Bi; Fuqiang Huang

doi:10.1002/chem.201704596

Efficient Reduction of CO₂ to CO Using Cobalt-Cobalt Oxide Core-Shell Catalysts

Chemistry. 2018 Feb 9;24(9):2157-2163. doi: 10.1002/chem.201704596. Epub 2018 Jan 16.

Authors

Guoheng Yin^{1

2}, Xiaotao Yuan³, Xianlong Du⁴, Wei Zhao¹, Qingyuan Bi¹, Fuqiang Huang^{1

3}

Affiliations

¹ State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
⁴ Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.

PMID: 29205557
DOI: 10.1002/chem.201704596

Abstract

The route of converting CO₂ to CO by reverse water-gas shift (RWGS) reaction is of particular interest due to the direct use of CO as feedstock in many significant industrial processes. Here, an engineered cobalt-cobalt oxide core-shell catalyst (Co@CoO) with nanochains structure has been made for the efficient reduction of CO₂ to useful CO. Owing to the excellent performance for H₂ activation of metal nanoparticles and the enhanced absorption and activation for CO₂ molecule of defective metal oxides, the unique synergistic effect of metallic Co and encapsulating coordinatively unsaturated CoO species shows high performance for clean generation of CO under moderate and practical conditions. Furthermore, with N-dopant into the defective CoO shell, the Co@CoO-N achieves the highest conversion of 19.2 % and an exceptional CO evolution rate of 96 mL min^-1 g_cat^-1 at 523 K with a gas hourly space velocity (GHSV) of 42,000 mL g_cat^-1 h^-1 , which is comparable with the previously reported materials under identical conditions.

Keywords: CO generation; CO2 utilization; coordinatively unsaturated species; nanochains; synergistic interactions.