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    • 6. 发明申请
    • EXHAUST GAS PURIFYING CATALYST SYSTEM
    • 排气净化催化剂体系
    • US20090084092A1
    • 2009-04-02
    • US12243063
    • 2008-10-01
    • Seiji MIYOSHIHideharu IWAKUNIKoji MINOSHIMAAkihide TAKAMIMasahiko SHIGETSU
    • Seiji MIYOSHIHideharu IWAKUNIKoji MINOSHIMAAkihide TAKAMIMasahiko SHIGETSU
    • F01N3/10
    • F01N3/10F01N13/009F01N2510/067F01N2570/16
    • Disclosed is an exhaust gas purifying catalyst system, which comprises an upstream catalyst disposed in an exhaust gas passage of an engine at a position on an upstream side with respect to a direction of an exhaust gas stream, and a downstream catalyst disposed in the exhaust gas passage at a position on a downstream side with respect to the direction of the exhaust gas stream. In the exhaust gas purifying catalyst system, the downstream catalyst includes a cerium (Ce)-containing rhodium-doped composite oxide and an Ni component, and the upstream catalyst includes a cerium (Ce)-containing composite oxide other than the rhodium-doped composite oxide, and a Ni component. A ratio of Ni to CeO2 in the upstream catalyst is in the range of 15 to 20 mass %, and a ratio of Ni to CeO2 in the downstream catalyst is in the range of 10 to 60 mass %. The exhaust gas purifying catalyst system of the present invention can reduce an amount of H2S emission while achieving high purification performance.
    • 公开了一种废气净化催化剂体系,其包括在排气流方向的上游侧的位置处配置在发动机的排气通路中的上游催化剂,以及配置在排气中的下游催化剂 相对于废气流的方向在下游侧的位置处的通道。 在排气净化催化剂体系中,下游催化剂​​包括含铈(Ce)的铑掺杂复合氧化物和Ni成分,上游催化剂包含除铑掺杂复合氧化物以外的含铈(Ce) 氧化物和Ni组分。 上游催化剂中的Ni与CeO 2的比例为15〜20质量%,下游催化剂​​中的Ni与CeO 2的比例为10〜60质量%。 本发明的废气净化催化剂体系可以在实现高纯化性能的同时,减少H2S排放量。