Citation: Janine Nebel, Stefan Schmidt, Qiushi Pan, Katrin Lotz, Stefan Kaluza, Martin Muhler. On the role of cobalt carbidization in higher alcohol synthesis over hydrotalcite-based Co-Cu catalysts[J]. Chinese Journal of Catalysis, ;2019, 40(11): 1731-1740. doi: S1872-2067(19)63344-9 shu

On the role of cobalt carbidization in higher alcohol synthesis over hydrotalcite-based Co-Cu catalysts

a Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, 44780 Bochum, Germany;
b Fraunhofer Institute for Environmental, Safety, and Energy Technology UMSICHT, Osterfelder Str. 3, 46047 Oberhausen, Germany

Received Date: 25 January 2019
Revised Date: 7 March 2019

Fund Project: , FKZ:03EK3041).The research project is funded by the Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF, Ver-bundvorhaben Carbon2Chem®

Co-Cu-based catalysts are widely applied in higher alcohol synthesis (HAS) from synthesis gas. Although the nature of the active sites is still not fully understood, the formation of Co₂C under HAS conditions seems to play a major role. A CO pretreatment procedure was developed allowing a systematic investigation of the influence of cobalt carbidization on the structural properties and catalytic performance of the catalysts. By exposing the catalyst to a CO-containing atmosphere prior to HAS, Co enrichment of the catalyst surface occurred followed by carbide formation. This surface modification decreased the formation of hydrocarbons and enhanced the formation of C₂₊OH. The catalyst pretreated with CO at 20 bar achieved the highest selectivity to ethanol and the lowest hydrocarbon selectivity.
- Higher alcohol synthesis,
- Co-Cu catalyst,
- Co₂C,
- CO pretreatment
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