Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La₂O₃ Catalysts for the Oxidative Coupling of Methane.

ABSTRACT: Oxidative coupling of methane (OCM) is a reaction to directly convert methane into high value-added hydrocarbons (C₂₊) such as ethylene and ethane using molecular oxygen and a catalyst. This work investigated lanthanum oxide catalysts for OCM, which were promoted with alkaline-earth metal oxides (Mg, Ca, Sr, and Ba) and prepared by the solution-mixing method. The synthesized catalysts were characterized using X-ray powder diffraction, CO₂-programmed desorption, and X-ray photoelectron spectroscopy. The comparative performance of each promoter showed that promising lanthanum-loaded alkaline-earth metal oxide catalysts were La-Sr and La-Ba. In contrast, the combination of La with Ca or Mg did not lead to a clear improvement of C₂₊ yield. The most promising La

SUBMITTER: Kiatsaengthong D 

PROVIDER: S-EPMC8771708 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature