Nissan Motor Company Limited

Misaki Akaishi

Junji Ito

Yasunari Hanaki

Tetsuro Naito

Hironori Wakamatsu

An exhaust gas purification catalyst includes: a first catalyst unit that consists of a hydrogen generating catalyst including a noble metal and an oxide that contains lanthanum, zirconium and an additional element such as neodymium; a second catalyst unit that consists of an oxygen storage/release material and a perovskite oxide disposed in contact with the oxygen storage/release material and represented by the general formula LaM1M2O, where La is lanthanum, M1 is at least one element selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca), M2 is at least one element selected from the group consisting of iron (Fe), cobalt (Co) and manganese (Mn), x satisfies 0&#x3c;x&#x2266;1, and &#x3b4; satisfies 0&#x2266;&#x3b4;&#x2266;1; and a holding material that holds the first catalyst unit and the second catalyst unit in a mutually separated state.

Exhaust gas purification catalyst

An exhaust gas purification catalyst contains a first catalyst in which an oxide of general formula (1): LaMM'O(where La is lanthanum, M is at least one selected from a group consisting of barium (Ba), strontium (Sr) and calcium (Ca), M&#x2032; is at least one selected from a group consisting of iron (Fe), cobalt (Co), nickel (Ni) and manganese (Mn), &#x3b4; is the amount of oxygen defect, and x and &#x3b4; satisfy 0&#x3c;x&#x2266;1 and 0&#x2266;&#x3b4;&#x2266;1) is supported by an oxide capable of occluding and releasing oxygen, and a second catalyst containing a noble metal. The particle size of the oxide capable of occluding and releasing oxygen is within the range from 1 to 50 nm. The particle size of the oxide of the general formula (1) is within the range from 1 to 30 nm.

Exhaust gas purification catalyst, exhaust gas purification monolith catalyst, and method for producing exhaust gas purification catalyst

An exhaust gas purifying catalyst having a high purifying ability even if noble metal is not used as an essential component, an exhaust gas purifying monolith catalyst, and a method for manufacturing an exhaust gas purifying catalyst, are provided. The exhaust gas purifying catalyst includes an oxide having an oxygen storage and release capacity, and an oxide represented by the following formula (1) supported on the oxide having the oxygen storage and release capacity,LaMM'O&#x2003;&#x2003;(1)(wherein La represents lanthanum, M represents at least one element selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca), M&#x2032; represents at least one element selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni) and manganese (Mn), &#x3b4; represents an oxygen deficient amount, and x and &#x3b4; fulfill conditions represented by 0&#x3c;x&#x2266;1 and 0&#x2266;&#x3b4;&#x2266;1, respectively).

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Yokosuka, Japan

Misaki Akaishi