Effect of SiO2-coating of FeK/Al2O3 catalysts on their activity and selectivity for CO2 hydrogenation to hydrocarbons

Fanshu Ding, Anfeng Zhang, Min Liu, Xinwen Guo, Chunshan Song

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

SiO2-coated FeK/Al2O3 catalysts with different silica content were prepared and examined for the synthesis of hydrocarbons from CO2 hydrogenation. It was found that SiO 2 coating affects both the activity for CO2 conversion and the selectivity to higher hydrocarbons, depending on the loading level. The catalyst with 9 wt% SiO2 coating showed both high CO2 conversion (63%) and high selectivity toward C2+ hydrocarbons (74%), while further higher coating led to suppression of catalyst activity. The analytical characterization of SiO2-coated catalysts confirmed the interactions of SiO2-Fe and SiO2-Al2O 3, which largely reduced the metal-support interaction and decreased the reduction temperature of iron oxide. In addition, an increase of adsorption capacity for CO was observed with desired SiO2 coating. It is likely that SiO2-coating improved the catalyst hydrophobic property, thereby reducing the negative impact of water by-product and facilitating the reverse water gas shift reaction and subsequent hydrogenation towards higher CO 2 conversion to higher hydrocarbons.

Original languageEnglish (US)
Pages (from-to)8930-8938
Number of pages9
JournalRSC Advances
Volume4
Issue number17
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering

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