A Homogeneous-Heterogeneous Kinetic Study of Oxidative Coupling of Methane (OCM) on La2O3/CeO2 Catalyst

Haoyi Wang*, Chaobo Yang, Can Shao, Sultan Alturkistani, Gaetano Magnotti, Jorge Gascon, Kazuhiro Takanabe, S. Mani Sarathy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A La2O3/CeO2 catalyst was synthesized and achieved 19 % C2+ yield with 65 % C2+ selectivity at 650 °C. The doping of CeO2 not only enhanced catalytic performance, but also improved catalyst stability in the presence CO2 and H2O. This study investigated the kinetics on La2O3/CeO2 over a wide range of operating conditions. Planar laser-induced fluorescence was implemented to directly observe the presence of formaldehyde, as the first time reported in OCM. A packed bed reactor model was constructed based on the dimensions of experimental setup and catalyst characterization. Rather than using a tuned gas phase model, the experimentally validated mechanism NUIGMech1.1 was implemented. The proposed homogeneous-heterogeneous OCM mechanism kinetic model was validated against experimental data under isothermal conditions, and the results show good agreement with measured species. The rate of production (ROP) was performed to identify the important reactions and prove the necessity of surface reactions for the OCM process.

Original languageEnglish (US)
Article numbere202200927
JournalChemCatChem
Volume14
Issue number23
DOIs
StatePublished - Dec 7 2022

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • homogeneous-heterogeneous reaction network
  • in situ XRD
  • kinetic modeling
  • oxidative coupling of methane
  • planar laser-induced fluorescence (PLIF)

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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