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=Volume 10 - 2022

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 microwave-ultrasonic combined method, and their morphologies & surface structure were changed by simply adding different amount of H2O (1-5 mL) in the precursor system. The adding of H2O changed the PVP micelle structure and the surface state, resulting in CeO2 with different specific surface area (64-111 m2∙g-1) and Ce3+ defectes (16.5-28.1%). The sample with 2 mL H2O exhibited high surface area (111.3 m2∙g-1) and the relatively more surface defects (Ce3+%: 28.1%), resulting in the excellent catalytic activity (4.34 mmol∙g-1∙h-1) for imine synthesis, which is 2 times higher than that of the CeO2 sample prepared without H2O.