Mazda Motor Corporation

Tokyo Roki Co., Ltd.

Masahiko Shigetsu

Akihide Takami

Masaaki Akamine

Hiroshi Yamada

Hisaya Kawabata

Takashi Takemoto

Koichiro Harada

Takashi Baba

Yasuhiro Matsumura

Satoshi Ichikawa

Kazuo Misonoo

Hideharu Iwakuni

Yuki Murakami

Kenji Okamoto

Makoto Kyogoku

Kazunari Komatsu

Yuki Koda

Toshitsugu Ueoka

Yoshiyuki Sato

Yasuhiro Ochi

Katsuyuki Fujita

Hiroshi Murakami

Kenichi Yamamoto

Seiji Miyoshi

Michihiro Imada

Takeo Yamauchi

Kazuya Yokota

Masayuki Kuroki

Yasuto Watanabe

Yusuke Koike

Taeko Shimizu

Susumu Mineoi

Tadashi Tokuyama

Toshihiko Ohsumi

Tomohiko Kawamoto

A device includes a first catalystincluding a Pd-containing catalyst layer and a Rh-containing catalyst layer and a second catalystcontaining Pt-loaded alumina and containing neither Rh nor Pd. The first catalyst or the second catalyst are disposed in one place in such a manner that one of the first catalystor the second catalystis located upstream of the other in a flow direction of an exhaust gas from an engine

Exhaust gas purification catalyst device and exhaust gas purification method

An exhaust gas purification catalytic devicecontains Pt, Pd, and Rh as catalytic metals. The catalytic metal Pt is loaded on silica-alumina which serves as a support, and Pt-loaded silica-alumina obtained by loading the Pt on the silica-alumina is contained in a catalytic layer with which an exhaust gas contacts first.

Catalyst device for exhaust gas purification and method for exhaust gas purification

An exhaust gas purify catalyst includes a substrate (), an oxidation catalyst layer () formed on the substrate () and containing zeolite and at least one catalytic metal, an LNT layer () formed on the oxidation catalyst layer () and containing an NOstorage material and at least one catalytic metal, and an NOreduction layer () formed on the LNT layer () and containing Rh acting as a catalytic metal and at least one of alumina or zirconia, wherein the NOreduction layer () has a larger content of Rh than that in each of the oxidation catalyst layer () and the LNT layer ().

Exhaust gas purifying catalyst, method for producing same, and exhaust gas purification method using same

An exhaust gas purification catalyst is disposed in an exhaust gas channel of an engine and includes a catalytic layerprovided on a substrate. The catalytic layercontains multiple types of &#x3b3;-aluminasandwhich are different in composition and Ptloaded on the multiple types of &#x3b3;-aluminasand

Exhaust gas purification catalyst and method for manufacturing same

This catalyst includes a lower catalytic layerhaving catalytic ability to oxidize HC and CO and an upper catalytic layerhaving catalytic ability to reduce NO. The lower catalytic layercontains Pt and Pd acting as catalytic metals, zeolite, a Ce-containing oxide, and activated alumina, and the upper catalytic layercontains activated alumina loading an Rh-doped Ce-containing oxide and an NOstorage material.

Exhaust gas purification catalyst and production method thereof

An exhaust gas component purification catalytic materialfor use in removal of particulates in an exhaust gas through combustion includes: composite oxide particlescontaining zirconium and neodymium and not containing cerium; and praseodymium oxide particlesin contact with the composite oxide particles

Exhaust gas component purification catalytic material and catalyzed particulate filter with the catalytic material

An exhaust gas purification catalyst includes a catalytic layer on a carrier, in which a particle component A and a particle component B are mixed. The particle component A is composed of catalytic-metal-doped CeZr-based mixed oxide powder, and has a particle size distribution with a peak in a particle size range of equal to or greater than 100 nm and equal to or less than 300 nm. A CeO/(CeO+ZrO) mass ratio of CeZr-based mixed oxide is equal to or greater than 30% and equal to or less than 75%. The particle component B is composed of at least one selected from a group consisting of activated alumina powder, Zr-based-oxide-supported alumina powder, and catalytic-metal-undoped CeZr-based mixed oxide powder. At least a part of particles of the particle component B has a particle size larger than that of the particle component A.

Exhaust gas purification catalyst

A filter is configured for efficient combustion of particulates accumulated on a catalyst layerin both a rapid combustion range and a slow combustion range. The catalyst layeron an exhaust gas passage wall of a filterincludes a mixture of a Rh-doped Ce-containing composite oxide particle material loaded with Pt and a composite particle material loaded with Pt. In mixed particles of this mixture, Zr-containing composite oxide particles containing no Ce and activated alumina particles are mixed together and agglomerated.

Catalyzed particulate filter

An exhaust gas purification catalyst includes a Rh-containing catalyst layer provided on a base material. The Rh-containing catalyst layer includes Rh-supporting Zr-based composite oxide in which Rh6 is supported on Zr-based composite oxide containing Zr and a rare earth metal except Ce. The Rh-supporting Zr-based composite oxide has been previously subjected to a reduction treatment.

Exhaust gas purification catalyst and method for producing the same

An exhaust gas purification catalytic material for purifying exhaust gas from an engine includes ZrLaY composite oxide containing ZrOas a main component, 2% by mass or more and 10% by mass or less of LaO, and 2% by mass or more and 20% by mass or less of YO, and Rh is loaded on the composite oxide.

An exhaust gas purification catalyst includes a Rh-containing catalyst layer provided on a base material. The Rh-containing catalyst layer includes a binder material of Rh-doped CeZr-based composite oxide containing Ce and Zr and doped with Rh. The binder material has been previously subjected to a reduction treatment.

An exhaust gas purification catalyst includes a catalytic layer containing a particle component A-1 and a particle component A-2 with different catalytic metal contents, each of which is composed of catalytic-metal-doped CeZr-based mixed oxide powder. The particle component A-1 having the lower catalytic metal content is supported on a particle component B composed of Zr-based-oxide-supported alumina powder, and the particle component A-2 having the higher catalytic metal content is supported on a particle component C composed of CeZr-based mixed oxide powder in which catalytic metal is not solid-dissolved.

A catalyst layer includes: a first mixed oxide particle componentwhich contains Ce and Rhand in which Rh is partially exposed at particle surfaces; and a second mixed oxide particle componentcontaining Ce, Zr, and a rare earth metal except Ce. The particle size distribution of the first mixed oxide particle componenthas a peak in the particle size range from 100 nm to 300 nm, both inclusive. The particle size distribution of the second mixed oxide particle componenthas a peak in a particle size range larger than the particle size range in which the first mixed oxide particle componenthas the peak. At least part of particles of the first mixed oxide particle componentis attached to at least part of particles of the second mixed oxide particle component

An upper catalyst layer of an upstream catalystand a downstream catalystincludes an oxygen storage/release material in/on which a catalytic metal is included or loaded. The content of the oxygen storage/release material per 1 L of a substrate in the catalyst layer of the upstream catalystis larger than that in the catalyst layer of the downstream catalyst. The oxygen release amount per a unit amount of the Rh is larger than that for the upper catalyst layer of the upstream catalyst. At least part of the oxygen storage/release material included in the downstream catalyst shows a particle size distribution having a peak particle size smaller than that in the upstream catalyst

Exhaust-gas purification catalytic system

A Rh-including catalyst layer of an upstream catalystincludes Rh-doped CeZr-based mixed oxide and Rh-loading CeZr-based mixed oxide as oxygen storage/release materials. A Rh-including catalyst layer of a downstream catalystincludes only Rh-doped CeZr-based mixed oxide as an oxygen storage/release material. The content of the oxygen storage/release materials included in the Rh-including catalyst layer of the upstream catalystis smaller than that of the downstream catalyst. The Rh-doped CeZr-based mixed oxide of the upstream catalystshows a particle size distribution having a peak particle size smaller than that of the Rh-doped CeZr-based mixed oxide of the downstream catalyst

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Higashihiroshima, Japan

Masahiko Shigetsu