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    • 7. 发明授权
    • Exhaust gas purifying catalyst
    • 废气净化催化剂
    • US08309488B2
    • 2012-11-13
    • US11995981
    • 2006-07-18
    • Ichiro KitamuraKenichi TakiAkimasa Hirai
    • Ichiro KitamuraKenichi TakiAkimasa Hirai
    • B01J23/00B01J21/00B01J20/00B01D50/00B01D53/34
    • B01J35/0006B01D53/945B01D53/9477B01D2255/1025B01D2255/407B01D2255/9022B01J23/63B01J37/0244F01N3/10F01N2370/02F01N2510/06Y02T10/22
    • An exhaust gas purifying catalyst includes a catalyst substrate and a catalyst coating layer containing a noble metal and a refractory inorganic oxide. The catalyst coating layer includes an upstream portion located upstream and a downstream portion located downstream in a flow direction of an exhaust gas. The upstream portion has a layered structure including an upstream portion inside layer containing a cerium-zirconium composite oxide in which a relative proportion of CeO2 is 50 to 95 wt %, as the refractory inorganic oxide and an upstream portion outside layer containing a cerium-zirconium composite oxide in which a relative proportion of ZrO2 is 50 to 95 wt %, as the refractory inorganic oxide. The upstream portion outside layer and the downstream portion contain Rh as the noble metal, and an amount of Rh contained in the upstream portion outside layer is larger than an amount of Rh contained in the downstream portion.
    • 废气净化催化剂包括催化剂基质和含有贵金属和耐火无机氧化物的催化剂涂层。 催化剂涂层包括位于上游的上游部分和位于排气流动方向下游的下游部分。 上游部分具有包括上游部分内层的层状结构,所述上层部分内层含有CeO 2的相对比例为50〜95重量%的铈 - 锆复合氧化物作为耐火无机氧化物,以及含有铈锆的上游部分外层 作为耐火性无机氧化物,ZrO 2的相对比例为50〜95重量%的复合氧化物。 上游部分外层和下游部分含有Rh作为贵金属,并且上游部分外层中包含的Rh的量大于下游部分中包含的Rh的量。