| 摘要 |
PURPOSE:To provide a catalyst for purification of exhaust gas excellent in activity at a low temp. and durability and capable of efficient purification of exhaust gas from the internal-combustion engine of an automobile, etc., in a wide range of fuel-air ratio from a region close to the stoichiometric region of the exhaust gas to the loan region. CONSTITUTION:This catalyst for purification of exhaust gas has a multilayered structure and contains K and/or Ca. The multilayered structure is formed by coating a honeycomb carrier with an inorg. material based on activated alumina contg. one or more kinds of noble metals selected from the group consisting of Pt, Pd and Rh in one or more layers and further coating the upper layer with an inorg. material based on zeolite contg. one or more kinds of metals selected from among Cu, Co, Ni, Ag, Fe and Zn. |
