Low temperature catalytic oxidation of NO over different-shaped CeO2

To investigate the effect of CeOnanomaterial morphology on its performance for NO catalytic oxidation.Three kinds of CeOnanomaterials including CeOnanorods,nanospheres and nanoparticles were prepared by hydrothermal method and used for catalytic oxidation of NO at low temperature. The experimental results show that CeOnanorods are of the best catalytic performance. Characterization techniques including TEM, XRD, H-TPR, NO-TPD and XPS were used to determine the relationship between the morphology of CeOnanomaterial and its catalytic performance. TEM images show that CeOnanorods predominantly exposed(110) and(10 0) planes, while CeOnanospheres and CeOnanoparticles predominantly exposed(111) plane. The excellent catalytic performance of CeOnanorods could be ascribed to the low crystallinity, high reducibility, strong NO adsorption ability and the presence of more surface chemisorbed oxygen.

To investigate the effect of CeO_2 nanomaterial morphology on its performance for NO catalytic oxidation.Three kinds of CeO_2 nanomaterials including CeO_2 nanorods,nanospheres and nanoparticles were prepared by hydrothermal method and used for catalytic oxidation of NO at low temperature. The experimental results show that CeO_2 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 CeO_2 nanomaterial and its catalytic performance. TEM images show that CeO_2 nanorods predominantly exposed(110) and(10 0) planes, while CeO_2 nanospheres and CeO_2 nanoparticles predominantly exposed(111) plane. The excellent catalytic performance of CeO_2 nanorods could be ascribed to the low crystallinity, high reducibility, strong NO adsorption ability and the presence of more surface chemisorbed oxygen.