Preparation of biomorphic porous La0.8Ce0.2Fe0.3Co0.7O3 perovskite-type catalysts for automobile exhaust purification
Biomorphic porous La 0.8 Ce 0.2 Fe 0.3 Co 0.7 O 3 perovskite-type catalysts are synthesized through a facile bio-templating method taking wood fiber as template for achieving the four-way purification of PM, NO x , CO, and HC emitted by automobile exhausts. The catalyst samples were characterized by X-ray diffractometer, Fourier-transform infrared spectroscopy, scanning electron microscope and Brunauer–Emmett–Teller analysis. The results showed that catalyst sample calcined at 700°C obtained high purity, high surface area (4.01 m 2 /g), wide pore size distribution and retained the initial wood fiber structure, which was suitable for purifying automobile exhausts. In addition, the performances for four-way purification under the simulated exhaust were analyzed by simulation test bench. The highest purification efficiency of PM, NO x , HC, and CO can reach 92%, 92%, 98%, and 76%, separately. Moreover, four-way purification mechanism was deduced according to the theoretical research of Mars-van krevelen on the redox reaction mechanism and experimental result.
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