CeO2 Structure Adjustment by H2O via the Microwave-Ultrasonic Method and Its Application in Imine Catalysis

Xijiang Chang; Huihui Ding; Jingxia Yang

doi:10.3389/fchem.2022.916092

CeO₂ Structure Adjustment by H₂O via the Microwave-Ultrasonic Method and Its Application in Imine Catalysis

Front Chem. 2022 May 31:10:916092. doi: 10.3389/fchem.2022.916092. eCollection 2022.

Authors

Xijiang Chang¹, Huihui Ding², Jingxia Yang²

Affiliations

¹ College of Science, Donghua University, Shanghai, China.
² College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China.

Abstract

CeO₂ with fusiform structures were prepared by the combined microwave-ultrasonic method, and their morphologies and surface structure were changed by simply adding different amounts of H₂O (1-5 ml) to the precursor system. The addition of H₂O changed the PVP micelle structure and the surface state, resulting in CeO₂ with a different specific surface area (64-111 m² g^-1) and Ce³⁺ defects (16.5%-28.1%). The sample with 2 ml H₂O exhibited a high surface area (111.3 m²∙g^-1) and relatively more surface defects (Ce³⁺%: 28.1%), resulting in excellent catalytic activity (4.34 mmol g^-1 h^-1).

Keywords: CeO2; catalyst; imine synthesis; microwave synthesis; microwave-ultrasonic combined method.