Synthesis of Value-Added Chemicals via Oxidative Coupling of Methanes over Na₂WO₄-TiO₂-MnO _x /SiO₂ Catalysts with Alkali or Alkali Earth Oxide Additives.

ABSTRACT: Na₂WO₄-TiO₂-MnO _x /SiO₂ (SM) catalysts with alkali (Li, K, Rb, Cs) or alkali earth (Mg, Ca, Sr, Ba) oxide additives, which were prepared using incipient wetness impregnation, were investigated for oxidative coupling of methane (OCM) to value-added hydrocarbons (C₂₊). A screening test that was performed on the catalysts revealed that SM with Sr (SM-Sr) had the highest yield of C₂₊. X-ray photoelectron spectroscopy analyses indicated that the catalysts with a relatively low binding energy of W 4f_7/2 facilitated a high CH₄ conversion. A combination of crystalline MnTiO₃, Mn₂O₃, α-cristobalite, Na₂WO₄, and TiO₂ phases was id

SUBMITTER: Kidamorn P 

PROVIDER: S-EPMC7301378 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature