Insight into CO2 methanation mechanism over NiUSY zeolites: An operando IR study

A. Westermann, B. Azambre, M. C. Bacariza, I. Graça, M. F. Ribeiro, J. M. Lopes, C. Henriques*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)

Abstract

Ni-impregnated USY zeolites with increasing Ni content (5, 10, 14%wt.) were investigated by operando IR spectroscopy for both CO2 adsorption and CO2 methanation conditions reaction. In-situ FTIR and TPD experiments highlighted a rather weak CO2 adsorption, which occurs namely as carbonates or CO2 linear complexes over cations (e.g., Na+). Under methanation conditions, dissociated hydrogen reacts with carbonates and/or physisorbed CO2, leading to monodentate formates, then carbonyls (both adsorbed onto Ni0 particles), and finally to methane. A detailed mechanism of the pathways involved in CO2 methanation over NiUSY catalysts is then discussed in accordance with infrared spectroscopic data.

Original languageEnglish
Pages (from-to)120-125
Number of pages6
JournalApplied Catalysis B: Environmental
Volume174-175
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • Carbonyls
  • Formates
  • Infrared operando spectroscopy
  • Mechanism
  • Ni-based zeolite

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