AUTHOR=Chang Xijiang , Ding Huihui , Yang Jingxia TITLE=CeO2 Structure Adjustment by H2O via the Microwave–Ultrasonic Method and Its Application in Imine Catalysis JOURNAL=Frontiers in Chemistry VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.916092 DOI=10.3389/fchem.2022.916092 ISSN=2296-2646 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).