Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Kabushiki Kaisha Toyota Chuo Kenkyusho

Tanaka Kikinzoku Kogyo K.k.

Cataler Corporation

Kabushiki Kaisha Toyota Chuo

Oji Kuno

Hiromasa Suzuki

Naoki Takahashi

Akira Morikawa

Hiroyuki Matsubara

Naohiro Hayashi

Masakazu Murata

Nobusuke Kabashima

Kae Yamamura

Masao Watanabe

Masahide Miura

Akihiko Suda

Toshitaka Tanabe

Akemi Sato

Takaaki Kanazawa

Takeshi Nobukawa

Mamoru Ishikiriyama

Keisuke Kishita

Masanori Yamato

Noboru Otake

Hiromochi Tanaka

Masayuki Saito

Keiji Kaita

Ryota Onoe

Naoto Miyoshi

Yuki Aoki

Takahiko Hirasawa

Nobuo Kamiya

Masaya Ibe

Kazumasa Takatori

Takao Tani

Akiya Chiba

Shinji Tsuji

Masahiko Sugiyama

Takeshi Hirabayashi

Noriko Yasutani

Koichi Yamashita

Ryuta Fujii

Hideo Kato

A fuel production plant includes an electrolysis apparatus; an ethanol generation apparatus that decomposes sugars to generate ethanol and carbon dioxide; and a hydrocarbon generation apparatus that generates hydrocarbons by reacting carbon dioxide with hydrogen. The fuel production plant further includes a hydrogen supply part that supplies hydrogen generated in the electrolysis apparatus to the hydrocarbon generation apparatus by coupling the electrolysis apparatus to the hydrocarbon generation apparatus, an oxygen supply part that supplies oxygen generated in the electrolysis apparatus to the ethanol generation apparatus by coupling the electrolysis apparatus to the ethanol generation apparatus, and a carbon dioxide supply part that supplies carbon dioxide generated in the ethanol generation apparatus to the hydrocarbon generation apparatus by coupling the ethanol generation apparatus to the hydrocarbon generation apparatus.

Fuel production plant

A honeycomb structural body is made of cordierite ceramic and composed of partition walls and cells. A cell density is changed continuously or step by step from a central section to an outer peripheral section in a radial direction. The honeycomb structural body has a relationship of M1&#x3e;M2&#x3e;M3, and a relationship of K1&#x3c;K2. M1 is an average cell density of a first section formed from a center to not more than &#x2153; R from the center. M2 is an average cell density of a second section formed within a range from &#x2153; R to &#x2154; R. M3 is an average cell density of a third section formed of more than &#x2154; R from the center to an outer peripheral surface. K1 and K2 are average cell density change rates of the first and second sections, respectively. R is a radius of the honeycomb structural body.

Honeycomb structural body

A honeycomb structural body has plural cell density sections having a cell density which is changed stepwise in a radial direction. A partition wall is formed between adjacent cell density sections. The cell density sections have a high cell density section having a maximum cell density, excepting an outermost cell density section formed at an outermost side, and a low cell density section having a minimum cell density, excepting an innermost cell density section formed at an innermost side. A relationship of V&#x2212;Va&#x2267;Vb+Vs is satisfied, where V indicates a volume of the honeycomb structural body if the overall honeycomb structural body is composed of the high cell density section, Va indicates a volume of the high cell density section, Vb indicates a volume of the cell density section, and Vs indicates a volume of the boundary wall which separates the low cell density section from the cell density section formed immediately inside of the low cell density section.

The exhaust gas purification apparatusaccording to the present invention is provided with an exhaust gas purification catalyst, an upstream Osensor, a downstream Osensor, and a control sectionthat executes main F/B control and sub-F/B control. This exhaust gas purification apparatuscontains, on a support in a prescribed regionfrom a catalyst-outlet-side endat the downstream side of an exhaust gas purification catalyst, an OSC material having a pyrochlore structure and an OSC material having an oxygen storage rate that is faster than that of the OSC material having a pyrochlore structure.

Exhaust gas purification apparatus

A ceria-zirconia base composite oxide contains a composite oxide of ceria and zirconia. In the ceria-zirconia base composite oxide, a content ratio between cerium and zirconium in the composite oxide is in a range from 43:57 to 48:52 in terms of molar ratio ([cerium]:[zirconium]). An intensity ratio of a diffraction line at 2&#x3b8;=14.5&#xb0; to a diffraction line at 2&#x3b8;=29&#xb0; {I(14/29) value} and an intensity ratio of a diffraction line at 2&#x3b8;=28.5&#xb0; to the diffraction line at 2&#x3b8;=29&#xb0; {I(28/29) value}, which are calculated from an X-ray diffraction pattern obtained by an X-ray diffraction measurement using CuKa after heating under a temperature condition of 1100&#xb0; C. in air for 5 hours, respectively satisfy the following conditions: I(14/29) value&#x2267;0.015, and I(28/29) value&#x2266;0.08.

Ceria-zirconia base composite oxide, method for producing the same, and catalyst for purification of exhaust gas using the ceria-zirconia base composite oxide

In a cross section, perpendicular to an axial direction of a honeycomb structural body having partition walls and cells, a plurality of sections having a different cell density is formed from a central area toward an outer peripheral area, and a partition wall is formed between the sections adjacent to each other. The boundary section has boundary partition walls and plural boundary cells having a polygonal shape different in shape from the cells in the sections formed adjacent to the boundary section. The partition walls in the sections adjacent to the boundary section are connected by the boundary partition walls. A part of the boundary cell is surrounded by at least the boundary partition walls. A relationship of &#x3c6;1/&#x3c6;2&#x2267;1.25 is satisfied, where &#x3c6;1 indicates an average hydraulic diameter of the boundary cells and &#x3c6;2 indicates an average hydraulic diameter of the cells.

Disclosed is an exhaust gas purifying catalyst in which grain growth of a noble metal particle supported on a support is suppressed. Also disclosed is a production process for producing an exhaust gas purifying catalyst. The exhaust gas purifying catalyst comprises a crystalline metal oxide support and a noble metal particle supported on the support, wherein the noble metal particle is epitaxially grown on the support, and wherein the noble metal particle is dispersed and supported on the outer and inner surfaces of the support. The process for producing an exhaust gas purifying catalyst comprises masking, in a solution, at least a part of the surface of a crystalline metal oxide support by a masking agent, introducing the support into a noble metal-containing solution containing a noble metal, and drying and firing the support and the noble metal-containing solution to support the noble metal on the support.

Exhaust gas purifying catalyst and production process thereof

Disclosed is an exhaust gas purifying catalyst in which grain growth of a noble metal particle supported on a support is suppressed. Also, disclosed is a production process of an exhaust gas purifying catalyst, by which the above exhaust gas purifying catalyst can be produced. The exhaust gas purifying catalyst comprises a crystalline metal oxide support and a noble metal particle supported on the support, wherein the noble metal particle is epitaxially grown on the support, and wherein the noble metal particle is dispersed and supported on the outer and inner surfaces of the support. The process for producing an exhaust gas purifying catalyst comprises masking, in a solution, at least a part of the surface of a crystalline metal oxide support by a masking agent, introducing the support into a noble metal-containing solution containing a noble metal, and drying and firing the support and the noble metal-containing solution to support the noble metal on the support.

The present invention relates to metal oxide particles having cores comprising larger molar amounts of zirconia than of ceria, and surface layers comprising larger molar amounts of ceria than of zirconia. Further, the present invention relates to a method for preparing the particles. The method comprises preparing a solution comprising zirconia sol and ceria sol, adjusting the pH of the solution within &#xb1;0.5 on the basis of the isoelectric point of zirconia, and aggregating zirconia and then aggregating ceria around the aggregated zirconia from the solution to make aggregates. Furthermore, the present invention relates to an exhaust gas purifying catalyst comprising the metal oxide particles, and a noble metal carried by the metal oxide particles.

Method for preparing metal oxide particles and an exhaust gas purifying catalyst

An exhaust gas purifying catalyst that contains a first oxygen storage material on which no noble metal is supported and which has a pyrochlore phase type regular array structure, and a second oxygen storage material which has a higher oxygen storage rate and a lower oxygen storage capacity than the first oxygen storage material and on which a platinum group noble metal is supported.

Exhaust gas purifying catalyst

A cerium-zirconium composite metal oxide having improved durability at high temperature and a stable oxygen storage capacity is provided. The cerium-zirconium composite metal oxide is characterized in that the total mole number of Ce and Zr is at least 85% based on the total mole number of metal in the composite metal oxide, a molar ratio Ce/Zr is within a range from 1/9 to 9/1, and an isoelectric point of the composite metal oxide is more than 3.5. Preferably, the molar ratio Ce/Zr is within a range from 3/7 to 7/3 and the isoelectric point is within a range from 3.8 to 5.0, and the cerium-zirconium composite metal oxide contains a rare earth metal (excluding Ce) in a concentration of less than 15% by mole based on the total mole number of metal in the composite metal oxide. Also the present invention provides a cerium-zirconium composite metal oxide, characterized in that CeOforms a core surrounded by ZrO.

Cerium-zirconium composite metal oxide

A particulate inorganic oxide containing aluminum oxide, a metal oxide forming no composite oxide with aluminum oxide, and an additional element including at least one of a rare-earth element and an alkali earth element, the inorganic oxide containing a secondary particle formed by aggregating primary particles; wherein at least a part of the secondary particle includes a plurality of first primary particles, each having a particle size of 100 nm or less, containing aluminum oxide and the additional element, and a plurality of second primary particles, each having a particle size of 100 nm or less, containing the metal oxide and the additional element; wherein at least a part of the first and second primary particles has a surface concentrated region where the additional element has a locally increased content in a surface layer part thereof.

Inorganic oxide, exhaust gas purifying catalyst carrier, and exhaust gas purifying catalyst

The present invention provides a catalyst support powdercomprising ceria and zirconia, wherein the ratio of the molar fraction (mol %) of ceria on the support powder surface as measured by the X-ray photoelectron spectroscopy to the molar fraction (mol %) of ceria in the raw material is from 1.0 to 1.5. Further, the present invention provides an exhaust gas purifying catalystcomprising the catalyst support powderand platinumsupported thereon.

Catalyst support powder and exhaust gas purifying catalyst

In the present invention, it is an assignment to optimize a loading density of noble metal on catalyst. Pt is loaded in such an amount that a loading amount per 1 liter of a support substrate exceeds 0.75 g on an exhaust-gas upstream side of a coating layer, and a loading density of Rh in the coating layer is made so that it becomes higher on an exhaust-gas downstream side than on the exhaust-gas upstream side. The purifying performance after warming up improves by loading Rh with high density on the exhaust-gas downstream side that is likely to become rich atmosphere.

Catalyst for purifying exhaust gas

The catalyst carrier in accordance with the present invention is a catalyst carrier comprising a support containing an oxide and an element in group 3A of the periodic table, and a coating part covering at least a part of a surface of the support; wherein the coating part contains an element in group 3A of the periodic table; and wherein the element in group 3A contained in the coating part has a concentration higher than that of the element in group 3A contained in the support. In this case, even when a catalyst in which rhodium is supported by the catalyst carrier is used for a long time in a high temperature environment, the grain growth of rhodium particles can be suppressed, and the catalyst can fully be prevented from lowering its activity.

Growing community of inventors

Toyota, Japan

Oji Kuno