Significant role of well-dispersed Fe2+ ions in the support of Ni catalysts in enhancing coking resistance during partial oxidation of methane

Abbas Khaleel, Abdul Rasheed Pillantakath, Abdulmuizz Adamson

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Coking is still a major cause of catalyst deactivation in catalytic methane reforming processes. In this work, doping the support of Ni/γ-Al2O3 catalysts with iron to provide redox functionality was found to significantly enhance coking resistance in methane partial oxidation. Catalysts with well-dispersed Fe3+ in the support, with Fe mass% in the range of 1.1–15.2 were prepared and tested in reactions at 700 °C. The catalyst with 3.2% Fe in the support showed negligible crystalline carbon at a coking rate of 9.0 × 10−6 gcg−1catalysth−1 compared with its Fe-free counterpart that showed a coking rate of 7.7 × 10−4 gcg−1catalysth−1. On the other hand, ≥10% Fe resulted in the formation of FeAl2O4 and Fe0 that promoted considerable coking. The unique influence of iron was referred to the role of the dispersed Fe2+, which is dominant upon reduction, in promoting a redox cycle that allow the oxidation and removal of carbon.

Original languageEnglish
Pages (from-to)33913-33926
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume48
Issue number87
DOIs
Publication statusPublished - Oct 29 2023

Keywords

  • Coking
  • Methane
  • Ni catalysts
  • Partial oxidation
  • Syngas

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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