Light olefin synthesis from CO2 hydrogenation over K-promoted Fe-Co bimetallic catalysts

Ratchprapa Satthawong, Naoto Koizumi, Chunshan Song, Pattarapan Prasassarakich

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

This work investigates the effects of potassium addition on light olefin production from CO2 hydrogenation over the Al2O3-supported Fe-Co bimetallic catalysts. The addition of small amount of K on the Fe-Co catalyst significantly enhanced C2-C4 olefin formation. The C2-C4 olefins predominated among C2+ hydrocarbons at K/Fe atomic ratio of 1. Temperature-programmed desorption experiments demonstrated that K addition diminished the weakly adsorbed hydrogen but enhanced CO2 adsorption on the catalyst surface, which led to significantly enhanced production of light olefins. For C2-C4 olefin synthesis at 573 K and 1.0 MPa, the K-promoted Fe-Co/Al2O3 catalyst also showed better performance than the K-promoted Fe-Mn/Al2O3 catalyst which is known as a good catalyst for olefin production, under the present conditions employed. The pathway of olefin formation from CO2 hydrogenation was analyzed. Light olefins were formed via two-step reactions over K-promoted Fe-Co catalysts with the formation of CO or CO-like intermediate as the first step. Some of these olefins could be further hydrogenated to paraffins, depending on the type and concentration of chemisorbed hydrogen on the catalyst surface.

Original languageEnglish (US)
Pages (from-to)34-40
Number of pages7
JournalCatalysis Today
Volume251
DOIs
StatePublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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