Abstract: The present invention provides a hydrocarbon adsorption device 10 configured to circulate a fluid and adsorb hydrocarbons in the fluid. The hydrocarbon adsorption device 10 includes a first hydrocarbon adsorption section 20 containing zeolite, and a second hydrocarbon adsorption section 30 which is provided downstream of the first hydrocarbon adsorption section 20 in the flowing direction of the fluid. The pore diameter P1 of the zeolite contained in the first hydrocarbon adsorption section 20 is smaller than the pore diameter P2 of the zeolite contained in the second hydrocarbon adsorption section 30 (i.e., P1<P2).

Abstract: The present invention provides a chemically stable catalyst for methane removal that exhibits excellent methane removal performance. The catalyst material for methane removal 30 of the invention includes a carrier 32 made of alumina and a catalyst 34 made of at least one of palladium and palladium oxide and carried directly on the carrier 32. With an exhaust gas purification catalyst test piece using this catalyst material for methane removal 30, a 50% methane removal temperature, which is an environmental temperature at which a methane removal rate reaches 50%, is not more than 347° C., based on the methane removal rate at 25° C. Furthermore, a specific surface area of the carrier 32 is preferably not more than 80 m2/g.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An exhaust gas purification material according to the present invention is provided with a particulate filter 10 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 10 differs between an upstream portion 10a of the filter 10 including an exhaust gas inlet-side end 10c, and a downstream portion 10b of the filter 10 including an exhaust gas outlet-side end 10d. The SCR catalyst contained in the upstream portion 10a and the SCR catalyst contained in the downstream portion 10b are qualitatively different. A ratio (B/A) of a maximum allowable adsorption amount of ammonia A in the upstream portion 10a and a maximum allowable adsorption amount of ammonia B in the downstream portion 10b satisfies the relationship 1.1?(B/A)?2.

Abstract: 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 ?m, as measured in accordance with a mercury intrusion technique, is 24000 mm3 or greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 ?m2 to 4.4 ?m2.

Abstract: 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 ?m, as measured in accordance with a mercury intrusion technique, is 24000 mm3 or greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 ?m2 to 4.4 ?m2.

Abstract: 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.

Abstract: Exhaust gas purification device having a catalyst layer including an Rh—Ba-loaded catalyst, and a Pt/Pd—Ba-loaded catalyst. The exhaust gas purification device satisfies at least one of (a) the degree of Rh—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—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—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—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—Ba-loaded catalyst.

Abstract: An exhaust gas purification material according to the present invention is provided with a particulate filter 10 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 10 differs between an upstream portion 10a of the filter 10 including an exhaust gas inlet-side end 10c, and a downstream portion 10b of the filter 10 including an exhaust gas outlet-side end 10d. The SCR catalyst contained in the upstream portion 10a and the SCR catalyst contained in the downstream portion 10b are qualitatively different. A ratio (B/A) of a maximum allowable adsorption amount of ammonia A in the upstream portion 10a and a maximum allowable adsorption amount of ammonia B in the downstream portion 10b satisfies the relationship 1.1?(B/A)?2.

Abstract: 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.

Abstract: 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<B).

Abstract: 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 NOx in 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<B).

Abstract: Exhaust gas purification device having a catalyst layer including an Rh—Ba-loaded catalyst, and a Pt/Pd—Ba-loaded catalyst. The exhaust gas purification device satisfies at least one of (a) the degree of Rh—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—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—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—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—Ba-loaded catalyst.

Abstract: 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.

Abstract: 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 NOx in 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<B).

Abstract: 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<B).

Abstract: 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.