EXHAUST GAS PURIFICATION CATALYST

摘要

This exhaust gas purification catalyst has a substrate (54), a lower layer (57) arranged on the substrate (54), and an upper layer (58) arranged on said lower layer (57). The upper layer (58) is provided with a first catalyst and a second catalyst, and the lower layer (57) is provided with the first catalyst. The first catalyst has Al2O3 as a carrier and has Pt and Pd as noble metals supported on said Al2O3. The second catalyst typically has Al2O3-ZrO2-TiO2 complex oxides and has Pd as a noble metal supported on said Al2O3-ZrO2-TiO2 complex oxides. Further, the upper layer (58) has a hydrocarbon absorbent (68).