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    • 42. 发明授权
    • Exhaust gas purification device for an engine
    • 发动机废气净化装置
    • US5448887A
    • 1995-09-12
    • US251821
    • 1994-05-31
    • Shinichi Takeshima
    • Shinichi Takeshima
    • B01D53/94F01N3/08F01N3/18F01N3/20F01N3/22F01N3/24F01N9/00F01N13/02F02B1/04F02D21/08F02D41/00F02D41/02F02D41/04F02D41/14F02M25/07F02M25/06F02N3/00
    • F02D41/0052B01D53/9481B01D53/9495F01N13/009F01N3/0842F01N3/0871F01N3/22F01N3/222F01N9/00F02D41/027F02D41/1474F02D41/1477F01N2250/12F01N3/20F02B1/04Y02T10/22Y02T10/47
    • An exhaust gas purification device of the present invention includes a three-way reducing and oxidizing catalyst disposed on an exhaust passage of an engine, and an NO.sub.x absorbent which absorbs NO.sub.x in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases absorbed NO.sub.x when the air-fuel ratio of the exhaust gas is rich; the engine in the present invention is controlled in most of its operating region in such a manner that the operating air-fuel ratio of the engine oscillates between a rich air-fuel ratio and a lean air-fuel ratio about a center value of a stoichiometric air-fuel ratio; when the operating air-fuel ratio of the engine becomes lean, the ability of the three-way catalyst for reducing NO.sub.x in the exhaust gas becomes low, and a part of NO.sub.x in the exhaust gas passes through the three-way catalyst, and, since the air-fuel ratio of the exhaust gas is lean, this NO.sub.x is absorbed in the NO.sub.x absorbent located downstream of the three-way catalyst; when the operating air-fuel ratio of the engine becomes rich, the ability of the three-way catalyst for oxidizing HC and CO in the exhaust gas becomes low, and a part of HC and CO in the exhaust gas passes through the three-day catalyst; since the air-fuel ratio of the exhaust gas is rich, absorbed NO.sub.x is released from the NO.sub.x absorbent and this NO.sub.x is reduced as HC and CO passes through the three-way catalyst; therefore, the pollutants such as HC, CO, NO.sub.x are almost completely removed.
    • 本发明的废气净化装置包括设置在发动机的排气通路上的三通还原氧化催化剂和当废气的空燃比为稀的时吸收废气中的NOx的NOx吸收剂 并且当排气的空燃比浓时释放吸收的NOx; 本发明的发动机在其大部分操作区域中被控制,使得发动机的运行空燃比在富空燃比和稀空燃比之间振荡,约为化学计量的中心值 空燃比; 当发动机的工作空燃比变稀时,用于还原排气中的NOx的三元催化剂的能力变低,排气中的NOx的一部分通过三元催化剂, 由于废气的空燃比是贫的,所以这种NOx被吸收在位于三元催化剂下游的NOx吸收剂中; 当发动机的运转空燃比变浓时,用于氧化废气中的HC和CO的三元催化剂的能力变低,排气中的HC和CO的一部分通过三天 催化剂; 由于排气的空燃比丰富,吸收的NOx从NOx吸收剂中释放出来,并且随着HC和CO通过三元催化剂,NOx降低; 因此,HC,CO,NOx等污染物几乎完全被去除。
    • 43. 发明授权
    • Semiconductor hydrocarbon sensor
    • 半导体烃传感器
    • US5296196A
    • 1994-03-22
    • US823720
    • 1992-01-22
    • Shinichi Takeshima
    • Shinichi Takeshima
    • B01D53/94B01D53/86G01N27/00G01N27/04G01N27/12G01N33/00
    • G01N33/0047G01N27/12G01N33/0014Y10T436/21
    • A semiconductor-type hydrocarbon sensor includes an oxide semiconductor, an outer electrode formed on an outside surface of the oxide semiconductor, an inner electrode formed on an inside surface of the oxide semiconductor, and a zeolite layer constructed of zeolite carrying at least one metal selected from the group consisting of platinum and copper. Small molecular weight hydrocarbons enter pores of the zeolite layer and are oxidized so that the small molecular weight hydrocarbons cannot reach the oxide semiconductor. Large molecular weight hydrocarbons cannot enter the small pores of the zeolite layer and, instead, pass through grain boundaries of zeolite particles of the zeolite layer to reach the oxide semiconductor. As a result, the large molecular weight hydrocarbons are selectively detected by the semiconductor-type hydrocarbon sensor.
    • 半导体型烃传感器包括氧化物半导体,形成在氧化物半导体的外表面上的外电极,形成在氧化物半导体的内表面上的内电极和由载有至少一种金属的沸石构成的沸石层 由铂和铜组成的组。 小分子量碳氢化合物进入沸石层的气孔并被氧化,使得小分子量烃不能到达氧化物半导体。 大分子量烃不能进入沸石层的小孔,而是通过沸石层沸石颗粒的晶界到达氧化物半导体。 结果,通过半导体型烃传感器选择性地检测大分子量烃。
    • 49. 发明授权
    • Automobile exhaust gas purification catalyst and method of production of same
    • 汽车废气净化催化剂及其生产方法相同
    • US08288310B2
    • 2012-10-16
    • US12513171
    • 2007-11-01
    • Shinichi TakeshimaAkio Koyama
    • Shinichi TakeshimaAkio Koyama
    • B01J23/00B01J21/00
    • B01D53/945B01D2255/1025B01D2255/20715B01J21/066B01J23/464B01J35/006B01J35/1014B01J37/0207B01J37/0211B01J37/08Y02A50/2324Y02T10/22
    • An automobile exhaust gas purification catalyst comprised of a support mainly comprised of ZrO2 in which Rh is supported as a catalyst metal preventing sintering of the support, raising the supporting efficiency, and raising the low temperature activity and a method of production of the same are provided. An automobile exhaust gas purification catalyst comprised of a support mainly comprised of ZrO2, sintered under firing conditions where the as fired ZrO2 will substantially not be charged in a catalyst metal supporting treatment solution, in which Rh is supported as a catalyst metal in a particle state. The method of production includes a step of charging the support mainly comprised of ZrO2 fired under the above firing conditions by applying at least one treatment of an acid treatment and a base treatment and a step of dipping the charged state support in the catalyst supporting treatment solution including a colloid of Rh as the catalyst metal to make the Rh colloid be adsorbed on the support.
    • 本发明提供一种汽车排气净化催化剂,其特征在于,主要由作为催化剂金属负载的作为催化剂金属的ZrO 2的载体,能够防止烧结烧结,提高支持效率,提高低温活性的载体及其制造方法 。 一种汽车废气净化催化剂,由主要由ZrO 2组成的载体组成,在烧成条件下烧结ZrO 2基本上不会在催化剂金属负载处理溶液中充电,其中Rh作为催化剂金属以粒子状态负载 。 该制造方法包括以下步骤:在上述烧成条件下,通过进行至少一种酸处理和碱处理的处理,以及将带电状态的载体浸渍在催化剂负载处理液中的步骤, 包括Rh的胶体作为催化剂金属,使Rh胶体吸附在载体上。