Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for CO

Leonardo Falbo, Michela Martinelli, Carlo Giorgio Visconti, Luca Lietti, Pio Forzatti, Claudia Bassano, Paolo Deiana

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Abstract

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.
Original languageEnglish
Pages (from-to)13146 - 13156
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume56
Issue number45
DOIs
Publication statusPublished - 15 Nov 2017

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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