Elucidating the Role of Surface Ce⁴⁺ and Oxygen Vacancies of CeO₂ in the Direct Synthesis of Dimethyl Carbonate from CO₂ and Methanol.

ABSTRACT: Cerium dioxide (CeO₂) was pretreated with reduction and reoxidation under different conditions in order to elucidate the role of surface Ce⁴⁺ and oxygen vacancies in the catalytic activity for direct synthesis of dimethyl carbonate (DMC) from CO₂ and methanol. The corresponding catalysts were comprehensively characterized using N₂ physisorption, XRD, TEM, XPS, TPD, and CO₂-FTIR. The results indicated that reduction treatment promotes the conversion of Ce⁴⁺ to Ce³⁺ and improves the concentration of surface oxygen vacancies, while reoxidation treatment facilitates the conversion of Ce³⁺ to Ce⁴⁺ and decreases the concentration of surface oxygen vacancies. The catalytic activity was linear with t

SUBMITTER: Zhang G 

PROVIDER: S-EPMC10180377 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature