Abstract: An S storage catalyst 2 is equipped with a catalytic supporter, a catalytic metal being supported on this catalytic supporter and oxidizing SO2 to SO3, and an S storage material being supported on the catalytic supporter and storing S components therein. This S storage catalyst 2 has an exhaust-gas-inlet-side high-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a high concentration, and an exhaust-gas-outlet-side low-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a low concentration that is lower than that of the high-concentration portion. In accordance with this S storage catalyst 2, it is possible to maintain the S storing performance favorably, even in a case where exhaust-gas temperatures are low, while keeping the material cost from rising steeply.

Abstract: A storage catalyst 3 is constituted of a supporter substrate 30, which is formed of at least one member being selected from the group consisting of Al2O3, CeO2, ZrO2, TiO2 and zeolite, and whose specific surface area is 30 m2/g or more, and a coating layer 31, which includes a supporting powder including at least one member being selected from the group consisting of Al2O3, CeO2, ZrO2, TiO2 and zeolite, a storage material for storing NOx and SOx, the storage material being supported on the supporting powder, and a noble metal being supported on the supporting powder. Since the supporter substrate 30 has a large specific surface area, a supporting amount of the storage material for storing NOx and SOx augments remarkably. Therefore, an SOx storage amount of the storage catalyst, which is put in place on an upstream side of an NOx storage-and-reduction catalyst, augments, and thereby an NOx storage amount in low-temperature regions augments.

Abstract: A noble metal is supported on an upstream-side catalytic portion 20 at least, and an SOx storage material, such as Mg and K that lower the noble metal's activities, is supported on a downstream-side catalytic portion 21. The noble metal being supported on the upstream-side catalytic portion 20 oxidizes SO2 efficiently to turn it into SOx, because the lowering of oxidizing activities is suppressed. These SOx are retained by means of storage in the SOx storage material being loaded on the downstream-side catalytic portion 21. Therefore, the SOx storing performance improves, and it is good in terms of durability as well.

Abstract: An S storage catalyst 2 is equipped with a catalytic supporter, a catalytic metal being supported on this catalytic supporter and oxidizing SO2 to SO3, and an S storage material being supported on the catalytic supporter and storing S components therein. This S storage catalyst 2 has an exhaust-gas-inlet-side high-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a high concentration, and an exhaust-gas-outlet-side low-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a low concentration that is lower than that of the high-concentration portion. In accordance with this S storage catalyst 2, it is possible to maintain the S storing performance favorably, even in a case where exhaust-gas temperatures are low, while keeping the material cost from rising steeply.

Abstract: A noble metal is supported on an upstream-side catalytic portion 20 at least, and an SOx storage material, such as Mg and K that lower the noble metal's activities, is supported on a downstream-side catalytic portion 21. The noble metal being supported on the upstream-side catalytic portion 20 oxidizes SO2 efficiently to turn it into SOx, because the lowering of oxidizing activities is suppressed. These SOx are retained by means of storage in the SOx storage material being loaded on the downstream-side catalytic portion 21. Therefore, the SOx storing performance improves, and it is good in terms of durability as well.

Abstract: A filter catalyst is for purifying exhaust gases, and comprises a honeycomb structure, a catalytic layer and a fibrous layer. The honeycomb structure comprises inlet cells clogged on a downstream side of a flow of the exhaust gases, outlet cells neighboring the inlet cells, and clogged on an upstream side of the flow of the exhaust gases, and cellular walls demarcating the inlet cells and the outlet cells, and having pores. The catalytic layer is formed on a surface of the cellular walls and an inner surface of the pores, and includes a porous oxide and a catalytic ingredient loaded on the porous oxide. The fibrous layer is formed on the outermost surface of the cellular walls of the inlet cells at least, and includes entangled fibrous substances composed of a heat-resistant material. The filter catalyst inhibits the pressure loss from increasing and upgrades the oxidizing rate of PMs greatly.

Abstract: A storage catalyst 3 is constituted of a supporter substrate 30, which is formed of at least one member being selected from the group consisting of Al2O3, CeO2, ZrO2, TiO2 and zeolite, and whose specific surface area is 30 m2/g or more, and a coating layer 31, which includes a supporting powder including at least one member being selected from the group consisting of Al2O3, CeO2, ZrO2, TiO2 and zeolite, a storage material for storing NOx and SOx, the storage material being supported on the supporting powder, and a noble metal being supported on the supporting powder. Since the supporter substrate 30 has a large specific surface area, a supporting amount of the storage material for storing NOx and SOx augments remarkably. Therefore, an SOx storage amount of the storage catalyst, which is put in place on an upstream side of an NOx storage-and-reduction catalyst, augments, and thereby an NOx storage amount in low-temperature regions augments.

Abstract: Disclosed is an exhaust gas purifying apparatus, which includes an upstream catalyst (3) having a straight flow structure supported with a first NOx occluding material for occluding NOx in a low temperature range, and with a precious metal, a midstream catalyst (4) having a straight flow structure supported with a second NOx occluding material for efficiently occluding NOx in an intermediate temperature range, and with a precious metal, and a downstream catalyst (5) having a wall flow structure supported with a third NOx occluding material for efficiently occluding NOx in a high temperature range, and with a precious metal. Three types of catalyst corresponding to the temperature of the exhaust gas are capable of sufficiently occluding NOx, thus improving both NOx purification performance and PM purification performance.

Abstract: The present invention provides an exhaust gas purifying filter that has an increased contact area, between a catalyst supported on the dividing walls of a honeycomb structural body and particulate matter deposited thereon, and can improve the capacity of the catalyst to oxidize the particulate matter, and a method of manufacturing the same. According to the present invention, the exhaust gas purifying filter 1 comprising the honeycomb structural body 10 made of ceramic and the catalyst 2 supported on the surface of the dividing walls 11 of the honeycomb structural body 10 has void ratio, of the dividing wall 11 of the honeycomb structural body 10, in a range from 55 to 80%, and the proportion of surface pores is 20% or higher.

Abstract: The present invention provides an exhaust gas purifying filter that has an increased contact area, between a catalyst supported on the dividing walls of a honeycomb structural body and particulate matter deposited thereon, and can improve the capacity of the catalyst to oxidize the particulate matter, and a method of manufacturing the same. According to the present invention, the exhaust gas purifying filter 1 comprising the honeycomb structural body 10 made of ceramic and the catalyst 2 supported on the surface of the dividing walls 11 of the honeycomb structural body 10 has void ratio, of the dividing wall 11 of the honeycomb structural body 10, in a range from 55 to 80%, and the proportion of surface pores is 20% or higher.

Abstract: A filter catalyst is for purifying exhaust gases, and comprises a honeycomb structure, a catalytic layer and a fibrous layer. The honeycomb structure comprises inlet cells clogged on a downstream side of a flow of the exhaust gases, outlet cells neighboring the inlet cells, and clogged on an upstream side of the flow of the exhaust gases, and cellular walls demarcating the inlet cells and the outlet cells, and having pores. The catalytic layer is formed on a surface of the cellular walls and an inner surface of the pores, and includes a porous oxide and a catalytic ingredient loaded on the porous oxide. The fibrous layer is formed on the outermost surface of the cellular walls of the inlet cells at least, and includes entangled fibrous substances composed of a heat-resistant material. The filter catalyst inhibits the pressure loss from increasing and upgrades the oxidizing rate of PMs greatly.

Abstract: There are proposed a diesel particulate filter being small in the pressure loss in the deposition of soot and high in the filtering efficiency and a ceramic sintered body constituting a main body thereof and a method of producing the same. The porous ceramic sintered body constituting the diesel particulate filter has communicated pores consisting of large pores 21 and small pores 22. The large pores are existent on at least surface layer portion of the sintered body, and the small pores 22 have a size relatively smaller than that of the large pore 21 and are existent on the surface layer and inside of the sintered body. Also, NOx occlusion catalyst is carried on the surface of the ceramic sintered body and the inner surfaces of the communicated pores.

Abstract: The present invention is a method of solidifying sulfur component being the cause of “SOx poisoning” by use of a sulfur solidifier. The solidifier includes a metal element having a function of oxidizing the sulfur component and a basic metal element. And the solidifier solidifies sulfur component before exhaust gas flows into an NOx-occluding reduction-type exhaust purifying catalyst located on an exhaust path. Since the foregoing sulfur solidifier includes the above metal element and the basic metal element, it can effectively solidify the sulfur component which are the cause of the SOx poisoning, and ensure improvement in purification performance.

Abstract: The present invention provides an exhaust gas purifying filter that has an increased contact area, between a catalyst supported on the dividing walls of a honeycomb structural body and particulate matter deposited thereon, and can improve the capacity of the catalyst to oxidize the particulate matter, and a method of manufacturing the same.

Abstract: The present invention is a method of solidifying sulfur component being the cause of “SOx poisoning” by use of a sulfur solidifier. The solidifier includes a metal element having a function of oxidizing the sulfur component and a basic metal element. And the solidifier solidifies sulfur component before exhaust gas flows into an NOx-occluding reduction-type exhaust purifying catalyst located on an exhaust path. Since the foregoing sulfur solidifier includes the above metal element and the basic metal element, it can effectively solidify the sulfur component which are the cause of the SOx poisoning, and ensure improvement in purification performance.

Abstract: A catalyst for purifying an exhaust gas includes a core, and a catalyst ingredient loading layer. The core includes a first support, and an NO.sub.x storage member involved in the first support. The catalyst ingredient loading layer includes a second support and a noble metal catalyst ingredient involved in the second support, and is formed on the core. The catalyst ingredient loading layer keeps SO.sub.x, included in the exhaust gas, from reaching the core. Hence, the NO.sub.x storage member is inhibited from being poisoned by sulfur. The NO.sub.x storage member is separated from the noble metal catalyst ingredient. Therefore, the noble metal catalyst ingredient is inhibited from sintering.

Abstract: An exhaust gas purifying catalyst is characterized in that at least one kind of catalyst metal is loaded on a layered porous silica or a layered porous silica-metal oxide. The exhaust gas purifying catalyst is used as an oxidation catalyst for purifying hydrocarbon and carbon monoxide, or a reduction catalyst for purifying nitrogen oxides (NO.sub.x), which is suitable for purifying exhaust gases in automobiles. An exhaust gas purifying apparatus includes the above exhaust gas purifying catalyst and an absorbent for trapping hydrocarbon components, in which aromatic HC such as trimethylbenzene and the like are effectively trapped.