Abstract: An exhaust gas cleaner which can attain an improvement in the efficiency of particulate filter regeneration and has excellent durability. The exhaust gas cleaner, which purifies an exhaust gas discharged from an internal combustion engine, comprises: a gas channel through which the exhaust gas flows; and a DPF (17) disposed in the gas channel and having many pores. The DPF (17) has an introduction surface (171) which comes into contact with the exhaust gas, the surface (171) having been almost wholly coated with a microporous material (18) having micropores with a smaller pore diameter than the pores. This microporous material (18) comprises a support made of an oxygen-storing/releasing oxide having one or more elements selected from the group consisting of alkaline earth metal elements, transition metal elements, Group-12 elements, and Group-13 elements and a silver-containing catalyst deposited on the support.

Abstract: Disclosed are: an exhaust gas purification catalyst which is capable of achieving a higher NOx removal ratio in comparison to conventional exhaust gas purification catalysts; and an exhaust gas purification apparatus which uses the exhaust gas purification catalyst. An exhaust gas purification catalyst comprises: a first catalyst layer that contains Pt and has NOx capturing ability; a second catalyst layer that contains a zeolite that has HC capturing ability; and an intermediate layer that is provided between the first catalyst layer and the second catalyst layer and has NOx reducing ability. The intermediate layer contains, as a main component, at least one oxide selected from the group consisting of CeO2, ZrO2 and complex oxides containing Ce and Zr, and also contains one or both of Rh and Pd. Also specifically disclosed is an exhaust gas purification apparatus which uses the exhaust gas purification catalyst.

Abstract: An exhaust gas cleaner which can attain an improvement in the efficiency of particulate filter regeneration and has excellent durability. The exhaust gas cleaner, which purifies an exhaust gas discharged from an internal combustion engine, comprises: a gas channel through which the exhaust gas flows; and a DPF (17) disposed in the gas channel and having many pores. The DPF (17) has an introduction surface (171) which comes into contact with the exhaust gas, the surface (171) having been almost wholly coated with a microporous material (18) having micropores with a smaller pore diameter than the pores. This microporous material (18) comprises a support made of an oxygen-storing/releasing oxide having one or more elements selected from the group consisting of alkaline earth metal elements, transition metal elements, Group-12 elements, and Group-13 elements and a silver-containing catalyst deposited on the support.

Abstract: A Cr trapping agent is disposed so that it contacts with constituting components of the substrate containing Cr. As the Cr trapping agent, an element or Ag is used, wherein the element is stronger in basicity than alkali metals or alkaline earth metals. Since the Cr trapping agent prevents transfer of Cr towards the alkali metals or alkaline earth metals, the reaction between Cr and alkali metals or alkaline earth metals is prevented.

Abstract: Use of a metallic material containing chromium as a substrate of an exhaust gas purifying catalyst has a problem that the chromium contained in the substrate migrates to a catalytically active component and reacts with the catalytically active component to reduce exhaust gas purification performance. Thus, a film which inhibits the chromium contained in the substrate from migrating is arranged on the substrate's surface. The film is desirably formed by oxidizing a substrate in the air. It is also desirable that a substrate containing aluminum therein be oxidized to cause aluminum contained in the substrate to separate out and thereby form an alpha-alumina film. The film is preferably such that, when the exhaust gas purifying catalyst is heated at 850° C. in the air for 300 hours, the amount of chromium migrated to the catalytically active component is controlled to 0.5 percent by weight or less based on the catalytically active component.

Abstract: A Cr trapping agent is disposed so that it contacts with constituting components of the substrate containing Cr. As the Cr trapping agent, an element or Ag is used, wherein the element is stronger in basicity than alkali metals or alkaline earth metals. Since the Cr trapping agent prevents transfer of Cr towards the alkali metals or alkaline earth metals, the reaction between Cr and alkali metals or alkaline earth metals is prevented.

Abstract: A catalyst coating 5 for decomposing ozone in the air is applied to an outer surface of cooling pipes 3 and radiating fins 4 of a radiator 2. A peel sensor 2 is provided on the catalyst coating 5 of the radiator 2 to detect a loss (remaining amount) of the catalyst coating 5. The position of detection of the peel sensor 2 is determined according to a temperature characteristic of the radiator 2, and a flow rate of the air passing through the radiator 2. The position of detection of the peel sensor 2 can be determined easily and appropriately, such that loss and deterioration of the catalyst coating 5 can be detected with high precision.

Abstract: A catalyst coating 5 for decomposing ozone in the air is applied to an outer surface of cooling pipes 3 and radiating fins 4 of a radiator 2. A peel sensor 2 is provided on the catalyst coating 5 of the radiator 2 to detect a loss (remaining amount) of the catalyst coating 5. The position of detection of the peel sensor 2 is determined according to a temperature characteristic of the radiator 2, and a flow rate of the air passing through the radiator 2. The position of detection of the peel sensor 2 can be determined easily and appropriately, such that loss and deterioration of the catalyst coating 5 can be detected with high precision.