Low temperature catalytic oxidation of NO over different-shaped CeO2

To investigate the effect of CeO2 nanomaterial morphology on its performance for NO catalytic oxidation. Three kinds of CeO2 nanomaterials including CeO2 nanorods, nanospheres and nanoparticles were prepared by hydrothermal method and used for catalytic oxidation of NO at low temperature. The experimental results show that CeO2 nanorods are of the best catalytic performance. Characterization techniques including TEM, XRD, H-2-TPR, NO-TPD and XPS were used to determine the relationship between the morphology of CeO2 nanomaterial and its catalytic performance. TEM images show that CeO2 nanorods predominantly exposed (110) and (1 0 0) planes, while CeO2 nanospheres and CeO2 nanoparticles predominantly exposed (1 1 1) plane. The excellent catalytic performance of CeO2 nanorods could be ascribed to the low crystallinity, high reducibility, strong NO adsorption ability and the presence of more surface chemisorbed oxygen. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.