Boosting light olefin selectivity in CO2 hydrogenation by adding Co to Fe catalysts within close proximity

Fei Yuan, Guanghui Zhang, Jie Zhu, Fanshu Ding, Anfeng Zhang, Chunshan Song, Xinwen Guo

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Direct conversion of carbon dioxide (CO2) into lower olefins (C2-C4=) is highly attractive as a sustainable production route for its great significance in greenhouse gas emission control and fossil fuel substitution. Fe-based catalysts have been extensively studied in CO2 hydrogenation, which usually show unsatisfactory selectivity toward lower olefins. Here we present a high-dispersion catalyst precursor CoFe2O4 with Na (Na-CoFe2O4) that offers C2-C4= space time yield as high as 2.88 μmolC2-C4= gcat−1 s-1 and olefin to paraffin ratio about 6 at CO2 conversion higher than 41 %. High dispersion and the intimate contact between Fe and Co sites help inhibit the formation of methane, and favor a higher selectivity of C2+ hydrocarbons, especially lower olefins. The presence of Na further promotes chain growth and suppresses the direct hydrogenation of Fe-(CH2)n intermediates. A superior stability over 100 h was observed, demonstrating the promising potential of this catalyst for industrial applications.

Original languageEnglish (US)
Pages (from-to)142-149
Number of pages8
JournalCatalysis Today
Volume371
DOIs
StatePublished - Jul 1 2021

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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