| 摘要 |
PURPOSE:To remove simultaneously carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxides (NOx) which are harmful components contained in an exhaust gas from internal combustion engines including automobiles. CONSTITUTION:A catalyst for cleaning exhaust gas composed of an integrated structure coated with a catalyst composition which contains (a) Pd and Rh or (b) Pd, RH, platinum as noble metals, and alkaline earth metal oxide, cerium oxide, zirconium oxide, and refractory metal oxide. A preferable catalyst composition for one liter of the integrated structure is: 0.1-50g of alkaline earth metal oxide, 5-100g of cerium oxide, 0.1-30g of zirconium oxide. Cerium oxide and zirconium oxide are preferably in the form at least partly of complex metal oxide or solid solution. |
