Tuning Interactions of Surface-adsorbed Species over Fe−Co/K−Al2O3 Catalyst by Different K Contents: Selective CO2 Hydrogenation to Light Olefins

Thanapha Numpilai, Narong Chanlek, Yingyot Poo-Arporn, Chin Kui Cheng, Nuchanart Siri-Nguan, Thana Sornchamni, Metta Chareonpanich, Paisan Kongkachuichay, Nevzat Yigit, Günther Rupprechter, Jumras Limtrakul, Thongthai Witoon

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Selective CO2 hydrogenation to light olefins over Fe−Co/K−Al2O3 catalysts was enhanced by tuning bonding strengths of adsorbed species by varying the content of the K promotor. Increasing the K/Fe atomic ratio from 0 to 0.5 increased the olefins/paraffins (O/P) ratio by 25.4 times, but then slightly raised upon ascending K/Fe to 2.5. The positive effect of K addition is attributed to the strong interaction of H adsorbed with the catalyst surface caused by the electron donor from K to Fe species. Although the Fe−Co/K−Al2O3 catalyst with K/Fe=2.5 reached the highest O/P ratio of 7.6, the maximum yield of light olefins of 16.4 % was achieved by the catalyst promoted with K/Fe of 0.5. This is explained by the considerable reduction of amount of H2 adsorbed on the catalyst surface with K/Fe=2.5.

Original languageBritish English
Pages (from-to)3306-3320
Number of pages15
JournalChemCatChem
Volume12
Issue number12
DOIs
StatePublished - 18 Jun 2020

Keywords

  • Carbon dioxide
  • Heterogeneous catalysis
  • Hydrogenation
  • K/Fe atomic ratio
  • Light olefins

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