Oxidative coupling of methane using oxidant mixtures of CO2 and O2 over Sr/La2O3

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Abstract

Oxidative coupling of methane with CO2 (CO2-OCM) is beneficial because it avoids complete oxidation, an undesired reaction that occurs during O2-oxidative coupling of methane. Previous literature has sparsely considered the respective roles of CO2 and O2 as reactants at CO2-OCM reaction conditions. This work explores the roles of CO2 and O2 in OCM over Sr/La2O3 with different reactant oxidant mixtures. While CO2 alone did not significantly activate methane at 875 °C, a tenfold increase in C2 yield resulted from adding 2 % O2. The role of CO2 in heterogeneous reactions was supported by XPS and XRD, which showed presence of carbonate species on the catalyst surface while the bulk phase remained La2O3. The work shows that a small amount of gaseous oxygen in the reactants can greatly improve methane conversion, and while oxygen is crucial in converting methane, CO2 plays an important role during ethane dehydrogenation.

Original languageEnglish (US)
Article number119587
JournalApplied Catalysis A: General
Volume673
DOIs
StatePublished - Mar 5 2024

Bibliographical note

Publisher Copyright:
© 2024 Elsevier B.V.

Keywords

  • Carbon dioxide
  • Oxidative coupling of methane
  • XPS

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