Abstract
As a study on the treatment of exhaust gases from a methanol-fueled vehicle, catalytic oxidation of formaldehyde and methanol on perovskite-type oxides was performed. La0.8Sr0.2MnO3, La0.8Sr0.2CoO3, YBa2Cu3O7 (superconductor), and ErBa2Cu3O7 (superconductor) were used as catalysts. La-based catalysts were prepared by a citrate method and calcined at 650°C, 800°C, and 900°C, respectively. The catalytic activity of La-based catalysts increased with the increase in the surface area that was dependent on the calcination temperature. Superconductive oxides were also prepared by a citrate method and calcined at 920°C. The catalytic activity of ErBa2Cu3O7 was found to be better than that of YBa2Cu3O7. For La-based perovskite calcined at 650°C, the catalytic activity of La0.8Sr0.2MnO3 was higher than La0.8Sr0.2CoO3. Calcining at 800°C and 900°C, however, the catalytic activity of LLa0.8Sr0.2 CoO3 was higher than La0.8Sr0.2MnO3.
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