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Efficient Reduction of CO 2 to CO Using Cobalt–Cobalt Oxide Core–Shell Catalysts
Author(s) -
Yin Guoheng,
Yuan Xiaotao,
Du Xianlong,
Zhao Wei,
Bi Qingyuan,
Huang Fuqiang
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704596
Subject(s) - cobalt , catalysis , cobalt oxide , space velocity , materials science , dopant , metal , oxide , chemical engineering , water gas shift reaction , nanoparticle , transition metal , inorganic chemistry , nanotechnology , chemistry , metallurgy , doping , organic chemistry , selectivity , optoelectronics , engineering
The route of converting CO 2 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 CO 2 to useful CO. Owing to the excellent performance for H 2 activation of metal nanoparticles and the enhanced absorption and activation for CO 2 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.