Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Kabushiki Kaisha Toyota Chuo Kenkyusho

Nobuyuki Takagi

Masahide Miura

Akira Morikawa

Toshitaka Tanabe

Yasutaka Nagai

Kazuhiko Dohmae

Toshio Yamamoto

Yasuo Ikeda

Tomomasa Aikawa

Shinichi Matsumoto

Miho Hatanaka

Shogo Shirakawa

Yuichi Sobue

Isao Naito

Hiroki Nihashi

Norimichi Shimano

Yoshihiro Goto

Shogo Kawamura

Naoki Takahashi

Kohei Yoshida

Takamitsu Asanuma

Masao Watanabe

Takeru Yoshida

Isao Chinzei

Nobumoto Ohashi

Satoru Katoh

Sho Hoshino

Takumi Tojo

Mitsuyoshi Okada

Takeshi Nobukawa

Kazunobu Ishibashi

Seiji Nakahigashi

Takayuki Endo

Minoru Ito

Nobusuke Kabashima

Takahiro Nishio

Takashi Onozuka

Masanori Yamato

Yasushi Satake

Yoshiteru Yazawa

Naoto Fujita

Taizo Yoshinaga

Yosuke Toda

Masamichi Kuwajima

Masaya Kamada

Ryoichi Inde

Hanae Ikeda

Yusuke Shinmyo

A catalyst for purification of exhaust gas including a substrate, and a catalyst coat layer which is formed on a surface of the substrate and contains catalyst particles, wherein the catalyst coat layer has an average thickness ranging 25 to 150 μm, a void fraction, as determined by scanning electron microscope observation of a cross-section of the catalyst coat layer, ranging 1.5 to 8.0% by volume, 60 to 90% by volume of all voids in the catalyst coat layer are high-aspect ratio pores which have equivalent circle diameters ranging 2 to 50 μm in a cross-sectional image of a cross-section of the catalyst coat layer perpendicular to a flow direction of exhaust gas in the substrate, and which ratios of 5 or higher, the high-aspect ratio pores have an average aspect ratio ranging 10 to 50, and a noble metal is supported on the entire catalyst coat layer.

Catalyst for purification of exhaust gas

A supported catalyst particles include oxide carrier particles and noble metal particles supported on the oxide carrier particles, wherein the mass of the noble metal particles is less than or equal to 5 mass % based on the mass of the oxide carrier particles, and the average particle size of the noble metal particles measured by transmission electron microscopy is 1.0-2.0 nm, with the standard deviation σ less than or equal to 0.8 nm.

Supported catalyst particles

An exhaust gas purification catalyst including an alkaline-earth metal carried on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purification catalyst has an alkaline-earth metal carrying region including a porous carrier, Pt, and a sulfuric acid salt of at least one alkaline-earth metal carried on the porous carrier, wherein a value of Ris 0.5 or more, where Rrepresents the Pearson's correlation coefficient calculated using &#x3b1; and &#x3b2; in each pixel obtained by, for a cross section of the region, performing the area analysis by FE-EPMA under the conditions of: pixel size 0.34 &#x3bc;m&#xd7;0.34 &#x3bc;m; and number of measured pixels 256&#xd7;256; and measuring an intensity (&#x3b1;: cps) of a characteristic X ray of an element (Ae) of the alkaline-earth metal and an intensity (&#x3b2;: cps) of a characteristic X ray of Pt for each pixel.

Exhaust gas purification catalyst

Provided is an exhaust gas purification device that allows improving an exhaust gas purification performance. An exhaust gas purification device of the present disclosure includes a substrate and a catalyst layer disposed on the substrate. The catalyst layer contains a porous carrier, a catalytic metal that is supported by the porous carrier and belongs to platinum group, an alkaline earth metal supported by the porous carrier, and an alkaline earth metal not supported by the porous carrier. At least a part of the alkaline earth metal supported by the porous carrier is supported inside the porous carrier.

Exhaust gas purification device

The present disclosure provides an exhaust gas purification material and an exhaust gas purification device that can efficiently remove harmful components even after being exposed to high temperature. Such exhaust gas purification material comprises metal oxide particles and noble metal particles supported on the metal oxide particles. The noble metal particles have a particle size distribution with a mean of 1.5 nm and 18 nm and a standard deviation of less than 1.6 nm.

Exhaust gas purification material and exhaust gas purification device

An oxygen storage material including a ceria-zirconia based composite oxide containing a composite oxide of ceria and zirconia, wherein

Oxygen storage material and method for producing the same

An oxygen storage material comprises a Ce&#x2014;Zr-Ln-Ti-based composite oxide containing cerium (Ce), zirconium (Zr), a rear-earth element (Ln: excluding cerium), and titanium (Ti), wherein

An oxygen storage material comprises a La&#x2014;Co&#x2014;Al-based composite oxide containing lanthanum, cobalt and aluminum. The La&#x2014;Co&#x2014;Al-based composite oxide is in a form in which at least part of the aluminum is solid-dissolved in a La&#x2014;Co composite oxide having a perovskite structure, and has a composition expressed by the following chemical formula (1):LaCoAlO&#x2003;&#x2003;(1)where x and y are numbers satisfying conditions of 0&#x3c;x &#x3c;1 and 0&#x3c;y&#x3c;1, where x+y=0.5 to 1.5, and &#x3b4; is a number of 1.5 to 4.5.

The exhaust gas purification catalyst according to the present invention has a substrate, a lower layerdisposed on this substrate, and an upper layerdisposed on this lower layer. The upper layeris provided with a first catalyst and a second catalyst, and the lower layeris provided with a first catalyst. This first catalyst has AlOas a carrier and Pt and Pd as noble metals supported on the AlO, while the second catalyst typically has an AlO&#x2014;ZrO&#x2014;TiOcomplex oxide as a carrier and has Pd as a noble metal supported on the AlO&#x2014;ZrO&#x2014;TiOcomplex oxide. Moreover, the upper layerhas a hydrocarbon adsorbent

A regeneration apparatus comprises a heaterwhich heats a catalystat the time of stopping fuel supply to an engine, a pumpwhich supplies an oxidizing gas or a reducing gas to the heated catalystand a switching valve. In the oxidizing step, catalytic poisons, for example hydrocarbon, which are absorbed on a noble metal are oxidized and removed. The particles of the noble metal become oxidized particles as pure oxide and the like. After the oxidizing step, the reducing step is carried out. In the reducing step, particles of the noble metal are reduced and re-dispersed on the support simultaneously and as a result, the particles of the noble metal become fine. Thus, a deteriorated catalyst can be regenerated without interrupting the use of catalyst and also without deteriorating the drivability.

Apparatus and method for regenerating catalyst for purifying exhaust gas

An internal combustion engine in an engine exhaust passage of which an NOadsorption catalyst () adsorbing NOcontained in exhaust gas at the time of a low temperature and desorbing the adsorbed NOwhen the temperature rises and an NOstorage catalyst () are arranged. When the NOstorage catalyst () can store NO, the temperature of the NOadsorption catalyst () is made to forcibly rise to a target temperature at which the amount of NOwhich the NOstorage catalyst () can store is desorbed, and the NOdesorbed from the NOadsorption catalyst () is stored in the NOstorage catalyst ().

Exhaust purification device of internal combustion engine

A metal oxide catalyst carrier particle has a center portion and an outer skin portion each containing a first metal oxide and a second metal oxide. The center portion and the outer skin portion are different in composition. The mole fraction of the metal of the first metal oxide is higher in the center portion than in the outer skin portion and the mole fraction of the metal of the second metal oxide is higher in the outer skin portion than in the center portion. The second metal oxide is selected from the group consisting of rare earth oxides, except for ceria, and alkali earth metal oxides. In addition, platinum is supported on the metal oxide catalyst carrier particle, thus forming an exhaust gas purification catalyst.

Metal oxide catalyst carrier particle and exhaust gas purification catalyst

An exhaust gas purification system includes: a catalyst () provided in an exhaust gas passage of an internal combustion engine () and having a carrier containing a basic oxide and platinum carried on the carrier; a catalyst () for purifying NOx; and oxygen supply means ().

Exhaust gas purification system for internal combustion engine

A catalyst for purification of exhaust gas in which a noble metal is supported on a metal-oxide support wherein, in a oxidation atmosphere, the noble metal exists on the surface of the support in high oxidation state, and the noble metal binds with a cation of the support via an oxygen atom on the surface of the support to form a surface oxide layer and, in a reduction atmosphere, the noble metal exists on the surface of the support in a metal state, and an amount of noble metal exposed at the surface of the support, measured by CO chemisorption, is 10% or more in atomic ratio to a whole amount of the noble metal supported on the support.

Catalyst for purification of exhaust gas, regeneration method for the catalyst, and apparatus and method for purification of exhaust gas using the catalyst

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Toyota, Japan

Nobuyuki Takagi