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发明授权
CN1846839B 尾气催化净化装置 失效 - 权利终止

尾气催化净化装置
摘要：
本发明公开了一种尾气催化净化装置。该装置包括：两个分别布置在发动机的废气排出通路中废气流动的上游一侧和下游一侧的催化剂3、4。上游侧催化剂3和下游侧催化剂4分别含有储氧材料，上游侧催化剂3的储氧材料，是将铑布置在含有铈和锆的复合氧化物的晶点或者晶点间而形成的，在同一温度下上游侧催化剂3的储氧材料的氧吸藏量比下游侧催化剂4的储氧材料的氧吸藏量多。因此，本发明能够提高排出气体净化催化剂装置的基本性能即净化性能、确保耐热性，还能谋求装置的小型化或者提高布置性。
摘要（英）：

An exhaust emission control device is disclosed. Two catalysts 3 and 4 are arranged in an exhaust passage of the engine on the upstream side and the downstream side of the exhaust gas flow, the upstream side catalyst 3 and the downstream side catalyst 4 include an oxygen occlusion material, Rh is arranged between crystal lattice points or lattice points of composite oxide including Ce and Zr in the oxygen occlusion material of the upstream side catalyst 3, and an oxygen occlusion amount of the oxygen occlusion material of the upstream side catalyst 3 is larger than that of the oxygen occlusionmaterial of the downstream side catalyst 4. The present invention improves purification efficiency and to secure of heat resistance, as basic efficiency of an exhaust emission control device, to miniaturize the device, and to improve layout performance.

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