| 摘要 |
<p>PURPOSE:To burn methane efficiently and also obtain the excellent heat resistance of catalysts by a method wherein catalysts of which carriers use gamma-Al2O3 and also bear palladium are placed at the early stage and catalysts of which carriers are the same as the said one and also bear noble metal are placed at the middle stage and catalysts of which carriers use specified compound oxide and also bear a kind of material at least selected from the oxide of base metal and a specified compound oxide are placed at the later stage. CONSTITUTION:As a carrier covering the surface of a honeycomb-shaped heat resisting substrate, gamma-Al2O3 is used and catalysts composed of the said carriers bearing also palladium are placed at the early stage and catalysts composed of the said carriers bearing also noble metal such as platinum, platinum-rhodium, etc., are placed at the middle stage. As a carrier, a kind of compound oxide at least selected from BaO-Al2O3, SrO-Al2O3 and CaO-Al2O3 is used and catalysts composed of the said carriers bearing also a kind of material at least selected from the oxide of base metal such as Mn, Co, Cr, Fe, etc., and a compound oxide such as LaCoO3, LaMnO3, etc., are placed at the later stage.</p> |
