The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the COxhydrogenation to heavy hydrocarbons in the presence of H2-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 °C and 30 bargafter an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H2/CO or H2/CO2mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher COxconversion rates. Furthermore, the Zn-promoted catalyst converted COxinto heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Falbo, L., Martinelli, M., Visconti, C. G., Lietti, L., Forzatti, P., Bassano, C., & Deiana, P. (2017). Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for CO. Industrial and Engineering Chemistry Research, 56(45), 13146 - 13156. https://doi.org/10.1021/acs.iecr.7b01494