CO2 hydrogenation to hydrocarbons over iron-based catalyst: Effects of physicochemical properties of Al2O3 supports

Fanshu Ding, Anfeng Zhang, Min Liu, Yi Zuo, Keyan Li, Xinwen Guo, Chunshan Song

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Abstract

The effects of surface hydroxyl groups and SiO2 content of alumina supports for FeK/Al2O3 catalysts on their activity and product selectivity for CO2 hydrogenation to hydrocarbons reaction were investigated. A series of iron-based catalysts supported on six commercial Al2O3 supports were prepared and tested for hydrocarbons production in a fixed-bed reactor. Surface acidic-basic hydroxyls distribution of the supports were evaluated by Fourier transform infrared (FT-IR) and point of zero charge (PZC) measurement. It was found that the PZC of Al2O3 supports strongly affects the dispersion as well as particle size of the Fe-based catalysts. Increasing PZC value of Al2O3, the iron dispersion increased and particle size decreased. The highest CO2 conversion (54.4%) and C5+ hydrocarbons selectivity (31.1%) were achieved when the PZC was 8.0. CO2 conversion and the long-chain products selectivity decreased when PZC declined. Moreover, SiO2-doping of alumina strongly affected the surface acidic-basic hydroxyls distribution of the supports, while a desired SiO2 content improved the catalyst activity by adjusting CO adsorption and the reduction behavior of the iron-based catalysts.

Original languageEnglish (US)
Pages (from-to)17563-17569
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume53
Issue number45
DOIs
StatePublished - Nov 12 2014

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All Science Journal Classification (ASJC) codes

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

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