Cataler Corporation

Toyota Jidosha Kabushiki Kaisha

Hiroto Imai

Makoto Tsuji

Shintaro Kobayashi

Hiroyuki Matsubara

Yusuke Shimmyo

Yasuyoshi Sasaki

Takeshi Nobukawa

Daisuke Ochiai

Takeshi Hirabayashi

Kou Sugawara

Takahiro Noguchi

Keisuke Kishita

Hiroto Yoshida

Keiji Horaguchi

An exhaust gas-purifying system includes an exhaust gas-purifying unit that includes one or more exhaust gas-purifying catalysts, is supplied with the exhaust gas from a combustion engine, and purifies the exhaust gas so that the exhaust gas can be released to the atmosphere, a sensor that detects a concentration of nitrogen oxides contained in the purified exhaust gas, and a processing section that makes a judgment with respect to at least one of the exhaust gas-purifying catalysts, as to whether or not a performance is maintained at a sufficient level, based on the concentration detected by the sensor.

Exhaust gas-purifying system and automotive vehicle

An oxidation catalyst device for exhaust gas purification, having a first catalyst coating layer on the exhaust gas flow's upstream side, second catalyst coating layer of an upper layer on exhaust gas flow's downstream side, and third catalyst coating layer of a lower layer on exhaust gas flow's downstream side, on a substrate, wherein the weight ratio of platinum to palladium in the first catalyst coating layer is 0.75 to 4.50, weight ratio of platinum to palladium in second catalyst coating layer is greater than 4.50 to 25.0, weight ratio of platinum to palladium in third catalyst coating layer is 0.12 or less, the length of first catalyst coating layer is 8% to 55% of the substrate's length, length of second catalyst coating layer is 45% to 95% of the substrate's length, and length of third catalyst coating layer is 45% to 95% of the substrate's length.

Oxidation catalyst device for exhaust gas purification

An exhaust gas purifying catalyst includes an inlet-side catalyst layer formed on an inner side of the partition wall from a surface of the partition wall in contact with an inlet-side cell and formed along an extension direction from an end portion on the exhaust gas inflow side, and an outlet-side catalyst layer formed on the inner side of the partition wall from a surface of the partition wall in contact with an outlet-side cell and formed along the extension direction from an end portion on the exhaust gas outflow side. Here, a sum of the lengths of the inlet-side catalyst layer and the outlet-side catalyst layer is larger than the entire length of the partition wall, and a total amount of an SCR catalyst body present in the outlet-side catalyst layer is larger than a total amount of an SCR catalyst body present in the inlet-side catalyst layer.

Exhaust gas purifying catalyst

An exhaust gas purification material according to the present invention is provided with a particulate filterthat traps particulate matter in exhaust gas and contains an SCR catalyst for adsorbing ammonia and reducing NOx in the exhaust gas. A maximum allowable adsorption amount of ammonia adsorbable by the filterdiffers between an upstream portionof the filterincluding an exhaust gas inlet-side end, and a downstream portionof the filterincluding an exhaust gas outlet-side end. The SCR catalyst contained in the upstream portionand the SCR catalyst contained in the downstream portionare qualitatively different. A ratio (B/A) of a maximum allowable adsorption amount of ammonia A in the upstream portionand a maximum allowable adsorption amount of ammonia B in the downstream portionsatisfies the relationship 1.1&#x2264;(B/A)&#x2264;2.

Exhaust gas purification material

The present invention provides an exhaust gas purification catalyst provided with: a substrate of wall flow structure in which inlet cells and outlet cells are partitioned by porous partition walls; and a catalyst layer disposed at least inside the partition wall and including a catalyst body. The catalyst layer satisfies the following conditions: (1) the pore volume of pores no larger than 5 &#x3bc;m, as measured in accordance with a mercury intrusion technique, is 24000 mmor greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 &#x3bc;mto 4.4 &#x3bc;m.

Exhaust gas purification catalyst

Exhaust gas purification device having a catalyst layer including an Rh&#x2014;Ba-loaded catalyst, and a Pt/Pd&#x2014;Ba-loaded catalyst. The exhaust gas purification device satisfies at least one of (a) the degree of Rh&#x2014;Ba dispersion is greater than 0.001 and less than 1.000, (b) the loaded amount of Ba based on the weight of a first carrier particle in the Rh&#x2014;Ba-loaded catalyst is greater than 0.01% by weight and less than 10.00% by weight, and the loaded amount of Ba based on the weight of a second carrier particle in the Pt/Pd&#x2014;Ba-loaded catalyst is 10.00% by weight to 20.00% by weight, and (c) the loaded amount of Ba based on the weight of the first carrier particle in Rh&#x2014;Ba-loaded catalyst is greater than 0.005 times to less than 0.800 times the loaded amount of Ba based on the weight of the second carrier particle in Pt/Pd&#x2014;Ba-loaded catalyst.

Exhaust gas purification device

An exhaust gas purification material according to the present invention is provided with a particulate filter that traps particulate matter in exhaust gas and contains an SCR catalyst for adsorbing ammonia and reducing NOx in the exhaust gas. A maximum allowable adsorption amount of ammonia adsorbable by the filter differs between an upstream portion of the filter including an exhaust gas inlet-side end, and an downstream portion of the filter including an exhaust gas outlet-side end. A maximum allowable adsorption amount of ammonia A in the upstream portion is smaller than a maximum allowable adsorption amount of ammonia B in the downstream portion (A&#x3c;B).

The exhaust gas purification apparatus is provided with: an upstream catalyst section which is disposed on the upstream side of an exhaust pipe; a downstream catalyst section which is disposed on the downstream side of the exhaust pipe with respect to the upstream catalyst section; and reducing agent solution supplier that supplies a reducing agent solution for generating ammonia from the upstream of the upstream catalyst section. The upstream catalyst section and the downstream catalyst section each include a SCR catalyst constituted by a zeolite, which adsorbs ammonia and reduces NOin the exhaust gas. The skeleton density (A) of the SCR catalyst included in the upstream catalyst section is less than the skeleton density (B) of the SCR catalyst included in the downstream catalyst section (A&#x3c;B).

Exhaust gas purification apparatus

The object of the present invention is to provide a novel exhaust gas purifying catalyst having excellent NOx purification performance. The object can be achieved by an exhaust gas purifying catalyst comprising: a substrate; and a catalyst layer disposed on the substrate which comprises a first carrier, and platinum and a first palladium supported on the first carrier; in which the weight ratio of the platinum to the first palladium is 3:1 to 8:1.

An exhaust gas purifying catalysthas a catalyst substrateand catalyst coating layersthat are formed on the catalyst substrateand contain (a) Rh, (b) Pt, (c) an alkali metal or alkaline earth element, and (d) an inorganic oxide. The catalyst coating layershas a layered structure including an inside layerwhere the component (a) is substantially locally existing, and an outside layerwhere the component (b) is substantially locally existing. The inside layeralso contains a zirconia oxide.

Growing community of inventors

Kakegawa, Japan

Hiroto Imai