Nissan Motor Company Limited

Nitivy Co., Ltd.

Yasunari Hanaki

Junji Ito

Hideaki Morisaka

Hiroshi Akama

Katsuo Suga

Masahiro Takaya

Tetsuro Naito

Toshiharu Miyamura

Hironori Wakamatsu

Hitoshi Onodera

Maki Shimada

Misaki Akaishi

Kouji Masuda

Motohisa Kamijo

Toru Nishizawa

Yoshiaki Hiramoto

Shigeru Chida

Shinji Yamamoto

Masanori Nakamura

Hiroshi Morita

Toru Sekiba

Hirofumi Yasuda

Hiroaki Kaneko

Hiroyuki Kanesaka

Haruhiko Shibayama

Takeshi Yamauchi

Shinichi Akaishi

Masato Nagata

Misaki Fujimoto

Naoki Harakawa

Michiaki Sagesaka

An exhaust gas purification catalyst contains an oxide 1 and an oxide 2. The catalyst has pores Pwith a pore size of from 1 nm to 260 nm, that can be measured by the nitrogen absorption method, and the total sum &#x3a3;PVof the pore volume PVof the pores is equal to or greater than 0.79 cm/g. The oxide 1 is an oxide with an oxygen release capability. The oxide 2 is represented by LaMM'O(2), where M is at least one element selected from the group consisting of Ba, Sr and Ca, M&#x2032; is at least one element selected from the group consisting of Fe, Co, Ni and Mn, &#x3b4; is the amount of oxygen deficiency, x satisfies 0&#x2264;x&#x2264;1, and &#x3b4; satisfies 0&#x2264;&#x3b4;&#x2264;1.

Exhaust gas purification catalyst and production method thereof

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 oxidation catalyst is disclosed, which contains Ce and Ga, and a Ce&#x2014;Ga composite oxide containing a solid solution in which a part of Ce is substituted with Ga. This oxidation catalyst is obtained in such a manner that pH of a mixed solution obtained by mixing a Ce-containing solution and a Ga-containing solution together is adjusted, and a precipitate obtained by coprecipitating Ce and Ga is dried and baked.

Oxidation catalyst and method for producing the oxidation 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

A particulate matter purifying material is used for a filter catalyst for purifying particulate matter that is disposed in an exhaust gas flow path of an internal combustion engine, traps the particulate matter in exhaust gas generated in the internal combustion engine, and burns the particulate matter to be deposited, so as to be regenerated. The particulate matter purifying material includes an oxide containing cerium (Ce) having an oxygen storage-release capacity, and at least one metal (Me) selected from the group consisting of Zr, Y, La, Pr, Sr, Nb and Nd, wherein a content ratio (Ce:Me) of cerium to the metal is 6:4 to 9:1 in terms of an atomic ratio, and a degree of crystallinity (CR) represented by the following formula (1) is within a range of 25 to 60%:Degree of crystallinity ()=&#xd7;100(%)&#x2003;&#x2003;(1)wherein I represents an X-ray diffraction peak intensity with regard to a (111) plane of a CeOphase in the particulate matter purifying material, and Irepresents the X-ray diffraction peak intensity with regard to the (111) plane of the CeOphase after the particulate matter purifying material is baked in air at 1000&#xb0; C.

Particulate matter purifying material, filter catalyst for purifying particulate matter using particulate matter purifying material, and method of regenerating filter catalyst for purifying particulate matter

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).

Exhaust gas purifying catalyst, exhaust gas purifying monolith catalyst, and method for manufacturing exhaust gas purifying catalyst

A lean NOx trap type exhaust gas purifying catalyst having a catalyst noble metal selected from a group consisting of platinum, palladium and rhodium, an inorganic oxide that carries the catalyst noble metal, and at least one NOx adsorbent one selected from a group of magnesium, barium, sodium, potassium and cesium. The inorganic oxide carrying palladium containing cerium in a CeO2-equivalent quantity in a range of 1 to 20 wt %, and at least one of aluminum and zirconium.

Lean NOx type exhaust gas purifying catalyst

A fibrous structure () of the present invention includes: long fibers () composed of an inorganic material; and short fibers () composed of the inorganic material and shorter than the long fibers (), wherein at least one of the long fibers () and the short fibers () includes catalyst components (), and a three-dimensional net-like structure is formed by the long fibers () and the short fibers ().

Fibrous structure and particulate filter type exhaust gas purifying catalyst

An exhaust gas purifying catalyst () includes: a three-dimensional structural substrate () having a plurality of cells () partitioned by cell walls () having pores (); and catalyst layers () formed in the three-dimensional structural substrate (). The catalyst layers () have pore-cover portions () formed on surfaces () of the pores () of the cell walls (). In addition, the catalyst layers () of the pore-cover portions () have activated pores () with a pore diameter of 0.1 micrometers to 10 micrometers. In the exhaust gas purifying catalyst (), the obstruction of the vent holes (pores ()) in the catalyst layers () can be controlled, and the pressure loss can be reduced.

Exhaust gas purifying catalyst and manufacturing method of the same

A catalytic converter includes: a three-dimensional structural support having a plurality of cells partitioned by porous cell walls, in which a pore diameter of the cell walls is 10 &#x3bc;m to 50 &#x3bc;m and porosity of the cell walls is 40 vol % or more; and a catalyst-coated layer containing a catalyst component. The catalyst-coated layer is coated on surfaces of the cell walls of the three-dimensional structural support. 50 mass % or more of a total supported amount of the catalyst component on the three-dimensional structural support is present in a region from the surfaces of the cell walls of the three-dimensional structural support to surfaces of the catalyst-coated layer.

Catalytic converter and manufacturing method thereof

A purifying catalyst includes catalyst powder composed of a transition metal oxide of which an average particle diameter is within 1 nm to 2 &#x3bc;m and in which an electron binding energy of oxygen is shifted to an energy side lower than 531.3 eV. The purifying catalyst shows good purification performance even when noble metal is not contained as an essential component.

Purifying catalyst

An inorganic fiber catalyst includes an alumina-silica fiber base material, and a plurality of catalyst component particles contained in the alumina-silica fiber base material. A mean particle diameter of the catalyst component particles contained in at least a surface portion of the alumina-silica fiber base material is 50 nm or less, and a standard deviation of particle diameters of the catalyst component particles is 30 or less.

Inorganic fiber catalyst, production method thereof and catalyst structure

A particulate matter oxidizing catalyst includes: at least one metal selected from the group consisting of: gallium, manganese, iron, cobalt, nickel, copper, yttrium, zirconium, niobium, molybdenum, silver, lanthanum, praseodymium, neodymium and gold; and cerium, wherein a first oxide includes: the cerium, and a first metal which is at least one element selected from the group consisting of: gallium, manganese, iron, cobalt and nickel, wherein a second oxide includes: the cerium, and a second metal which is at least one element selected from the group consisting of: praseodymium, zirconium and aluminum, and wherein the second oxide and the first oxide have a content ratio of second oxide/(first oxide+second oxide)=0.1 by mass to 0.8 by mass.

Particulate matter (PM) oxidizing catalyst

An exhaust gas purging catalyst, includes: an integrated carrier; and a catalyst coat layer formed on the integrated carrier. The catalyst coat layer includes a catalyst component and meets the following expression (A): P&#x2267;0.17W&#x2212;0.04 - - - (A). P denotes a summation (ml) of a capacity of a void per mass (g) of the catalyst coat layer. The void has a pore diameter of 0.1 &#x3bc;m to 1 &#x3bc;m. W denotes a volume (ml) of the catalyst coat layer per the mass (g) of the catalyst coat layer.

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Yokohama, Japan

Yasunari Hanaki