Abstract
Different morphologies of nano-CeO2 (rod, cube, and polyhedron) were successfully prepared by the hydrothermal method. La0.8Ce0.2MnO3 catalysts were deposited on the surface of these CeO2 to obtain La0.8Ce0.2MnO3/CeO2 catalysts. The catalytic activity of these materials was tested for toluene catalytic combustion, and the role of nano-CeO2 morphology on the catalyst activity was investigated. It was found that the morphology of CeO2 had a great effect on the activity of La0.8Ce0.2MnO3. La0.8Ce0.2MnO3/CeO2 nanopolyhedra exhibited the best activity at both low-temperature and high-temperature; the ignition temperature and complete conversion temperature were 128 and 240°C, respectively. The relationship between the structural properties of different morphologies CeO2 and the catalyst activity was investigated by scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Brunauer–Emmett–Teller (BET) and H2-temperature programmed reduction (H2-TPR). The higher catalytic activity of La0.8Ce0.2MnO3/CeO2 nanopolyhedra was attributed to high specific surface area, small grains, more oxygen vacancies, and highly reactive oxygen species. La0.8Ce0.2MnO3/CeO2 nanorods had poor low-temperature activity because of high reduction temperature; La0.8Ce0.2MnO3/CeO2 nanocubes had higher hydrogen consumption, but the smaller specific surface area limited the catalytic activity.
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