公开(公告)号：EP1321186B1

公开(公告)日：2006-07-19

申请号：EP01961322.3

申请日：2001-09-03

申请人： Toyota Jidosha Kabushiki Kaisha

发明人： YAMASHITA, Tetsuya, C/O TOYOTA JIDOSHA K K ,  TAKESHIMA, Shinichi, C/O TOYOTA JIDOSHA K K ,  TANAKA, Toshiaki, C/O TOYOTA JIDOSHA K K

IPC分类号： B01J20/06 ,  B01J20/08 ,  B01J23/58 ,  B01D53/94

CPC分类号： B01J23/63 ,  B01D53/8628 ,  B01J21/066 ,  B01J23/58

摘要： A NOx absorbing agent, characterized in that it comprises a crystalline ZrO2 composite oxide containing at least one element of trivalent rare earth metals and divalent alkaline earth metals added thereto and, carried thereon, at least one element of alkali metals and alkaline earth metals; and an absorption reduction type catalyst for removing NOx, characterized in that it comprises the NOx absorbing agent and a noble metal. Preferably, the NOx absorbing agent further comprises aluminum carried on the ZrO2 composite oxide. The NOx absorbing agent is supposed to absorb NOx through a mechanism wherein an electron released from an alkali metal or the like is incorporated into an oxygen defect portion of the crystalline ZrO2 composite oxide and the resultant oxygen defect portion acts as a strong basic point donating an electron to an electrophilic component such as NOx. The absorption reduction type catalyst for removing NOx exhibits high performance capability of removing NOx even under a condition wherein an exhaust gas has a temperature of 500°C or higher.

公开(公告)号：EP1321186A1

公开(公告)日：2003-06-25

申请号：EP01961322.3

申请日：2001-09-03

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： YAMASHITA, Tetsuya, C/O TOYOTA JIDOSHA K K ,  TAKESHIMA, Shinichi, C/O TOYOTA JIDOSHA K K ,  TANAKA, Toshiaki, C/O TOYOTA JIDOSHA K K

IPC分类号： B01J20/06 ,  B01J20/08 ,  B01J23/58

CPC分类号： B01J23/63 ,  B01D53/8628 ,  B01J21/066 ,  B01J23/58

摘要： An exhaust gas purifying catalyst capable of exerting excellent NO x purifying capability even at high exhaust gas temperatures, exceeding 500°C, is provided.
The catalyst is an absorption reduction-type NO x purifying catalyst comprising an NO x absorbent obtained by loading at least one alkali metal or alkaline earth metal on a crystalline ZrO 2 composite oxide having added thereto at least one trivalent rare earth metal or divalent alkaline earth metal. Preferably, aluminum is further supported on the ZrO 2 composite oxide. The NO x absorbent is considered to have an NO x absorption mechanism that an electron released from the alkali metal or the like enters into an oxygen vacancy part of the crystalline ZrO 2 and this oxygen vacancy part functions as a strong base site for donating an electron to an electrophilic component such as NO x .

摘要翻译： 提供即使在超过500℃的高废气温度下也能够发挥优异的NOx净化能力的废气净化催化剂。 催化剂是吸收还原型NOx净化催化剂，其包含通过在至少一种三价稀土金属或二价碱土金属上加入至少一种碱金属或碱土金属的结晶ZrO 2复合氧化物上而获得的NOx吸收剂。 优选地，在ZrO 2复合氧化物上进一步负载铝。 认为NOx吸收剂具有从碱金属等释放的电子进入结晶ZrO 2的氧空位部的NOx吸收机理，该氧空位部作为向亲电子体供给电子的强碱性部位起作用 组分如NOx。