Catalytic conversion of syngas to mixed alcohols over Zn-Mn promoted Cu-Fe based catalyst

Zn-Mn promoted Cu-Fe based catalyst was synthesized by the co-precipitation method. Mixed alcohols synthesis from syngas was studied in a half-inch tubular reactor system after the catalyst was reduced. Zn-Mn promoted Cu-Fe based catalyst was characterized by SEM-EDS, TEM, XRD, and XPS. The liquid phase products (alcohol phase and hydrocarbon phase) were analyzed by GC–MS and the gas phase products were analyzed by GC. The results showed that Zn-Mn promoted Cu-Fe based catalyst had high catalytic activity and high alcohol selectivity. The maximal CO conversion rate was 72%, and the yield of alcohol and hydrocarbons were also very high. Cu (1 1 1) was the active site for mixed alcohols synthesis, Fe2C (1 0 1) was the active site for olefin and paraffin synthesis. The reaction mechanism of mixed alcohols synthesis from syngas over Zn-Mn promoted Cu-Fe based catalyst was proposed. Zn-Mn promoted Cu-Fe based catalyst can be regarded as a potential candidate for catalytic conversion of biomass-derived syngas to mixed alcohols.

.Figure optionsDownload high-quality image (150 K)Download as PowerPoint slideHighlights
► Zn-Mn promoted Cu-Fe based catalyst had high catalytic activity and selectivity.
► The state of proposed catalyst was firstly identified to determine the active sites.
► Cu (1 1 1) was the active site for mixed alcohols synthesis.
► Fe2C (1 0 1) was the active site for olefin and paraffin synthesis.
► The reaction mechanism was proposed for mixed alcohols synthesis from this catalyst.