Abstract: An exhaust gas purification catalyst includes: a support containing alumina as a major component; and an active species fine particle containing silver sulfate as a major component and having an average crystallite size of 3 nm to less than 100 nm, in which the active species fine particle is supported on a surface of the support.

Abstract: A particulate filter for trapping particulate filter which is contained in exhaust gas is arranged in an engine exhaust passage. The particulate filter is provided with exhaust gas inflow passages and exhaust gas outflow passages which are alternately arranged via porous partition walls. Movement promoting control is performed to promote movement of the ash which deposits on the inner circumferences of the exhaust gas inflow passages to the rear parts of the exhaust gas inflow passages. The pressure loss of the particulate filter is detected. When the detected pressure loss is larger than a predetermined upper limit value, PM removal control is performed to remove the particulate matter from the particulate filter.

Abstract: An exhaust gas purifying apparatus is comprised of a plurality of exhaust gas passages, and a filter body 3 installed in the exhaust gas passages. The exhaust gas passage contains a filter-conducting portion 100 of conducting the exhaust gas to the filter body 3, and a filter-bypassing portion 200 of bypassing the filter-conducting portion 100 by branching out to an exhaust gas passage adjacent from the filter-conducting portion 100. When PMs are deposited on the filter-conducting portion 100 and an exhaust gas pressure loss is increased, the exhaust gas is branched out from the filter-bypassing portion 200 to flow.

Abstract: A catalyst for purifying exhaust gases includes a substrate, and projections. The substrate is provided with straight-flow gas-flow passages. The projections protrude from the straight-flow gas-flow passages in a height of 50 ?m or more, and include a precipitate, which is composed of at least one catalytic ingredient selected from the group consisting of alkali metals and alkaline-earth metals.

Abstract: To provide a filter catalyst in which the closure of ventilation holes by a catalytic layer is inhibited. A filter catalyst of the present invention is characterized in that it has pores of 1-20 ?m in a porosity of 11% or more. The filter catalyst of the present invention has an effect of being capable of inhibiting the rise of pressure loss when sufficient particulates deposit.

Abstract: An exhaust gas-purifying apparatus includes an NOx sorbing-and-reducing first catalyst, a filter second catalyst, and an NOx sorbing-and-reducing third catalyst, which are disposed in an exhaust system in this order from a downstream side to an upstream side of a flow of exhaust gases. In the exhaust system, a liquid reducing agent is supplied into the exhaust gases intermittently. The first catalyst exhibits a remarkably high NOx purifying ability, because not only the third catalyst and the second catalyst gasify, crack and homogenize the reducing gas fully but also the reactions at the third and second catalysts elevate the temperature of exhaust gases. Thus, the exhaust gas-purifying apparatus can purify PMs and NOx efficiently.

Abstract: An exhaust gas purifying apparatus is comprised of a plurality of exhaust gas passages, and a filter body 3 installed in the exhaust gas passages. The exhaust gas passage contains a filter-conducting portion 100 of conducting the exhaust gas to the filter body 3, and a filter-bypassing portion 200 of bypassing the filter-conducting portion 100 by branching out to an exhaust gas passage adjacent from the filter-conducting portion 100. When PMs are deposited on the filter-conducting portion 100 and an exhaust gas pressure loss is increased, the exhaust gas is branched out from the filter-bypassing portion 200 to flow.

Abstract: To provide a filter catalyst in which the closure of ventilation holes by a catalytic layer is inhibited. A filter catalyst of the present invention is characterized in that it has pores of 1-20 ?m in a porosity of 11% or more. The filter catalyst of the present invention has an effect of being capable of inhibiting the rise of pressure loss when sufficient particulates deposit.

Abstract: A filter catalyst for purifying exhaust gases having a catalytic layer comprising the first catalyst support 2 having an average particle diameter of 1 ?m or less, the second catalyst support 3 having an average particle diameter from 1/20 to ½ of the average pore diameter of the filter cellular walls 12 and catalytic ingredients, on the filter cellular walls 12 having an average pore diameter of from 20 to 40 ?m, and the catalytic layer having uneven surfaces is used. Since the second catalyst support hardly enters into the pore with a diameter of 20 ?m or less, it exists partly on the filter cellular walls and the inside surface of the wall. Therefore, since particles collide with the convex part of the catalytic layer, it becomes possible to collect them easily and the collecting rate for particles and the ability of the particles purification are improved.

Abstract: A filter catalyst is for purifying exhaust gases emitted from internal combustion engines and including particulates, and includes a wall-flow honeycomb structure and an upstream-side straight honeycomb structure. The wall-flow honeycomb structure includes inlet cells clogged on the downstream side of the exhaust gases, outlet cells neighboring the inlet cells and clogged on the upstream side of the exhaust gases, filter cellular walls demarcating the inlet cells and the outlet cells and having pores, and a catalytic layer formed on the surface of the filter cellular walls and/or the surface of the pores of the filter cellular walls. The upstream-side straight honeycomb structure is disposed on the upstream side of the exhaust gases with respect to the wall-flow honeycomb structure, is provided integrally with the wall-flow honeycomb structure, and includes upstream-side straight cells in which the exhaust gases flow straight, and upstream-side cellular walls demarcating the upstream-side straight cells.

Abstract: An exhaust gas-purifying apparatus includes an NOx sorbing-and-reducing first catalyst, a filter second catalyst, and an NOx sorbing-and-reducing third catalyst, which are disposed in an exhaust system in this order from a downstream side to an upstream side of a flow of exhaust gases. In the exhaust system, a liquid reducing agent is supplied into the exhaust gases intermittently. The first catalyst exhibits a remarkably high NOx purifying ability, because not only the third catalyst and the second catalyst gasify, crack and homogenize the reducing gas fully but also the reactions at the third and second catalysts elevate the temperature of exhaust gases. Thus, the exhaust gas-purifying apparatus can purify PMs and NOx efficiently.

Abstract: The filter catalyst for purifying exhaust gases having a catalytic layer comprising the first catalyst support 2 having an average particle diameter of 1 &mgr;m or less, the second catalyst support 3 having an average particle diameter from {fraction (1/20)} to ½ of the average pore diameter of the filter cellular walls 12 and catalytic ingredients, on the filter cellular walls 12 having an average pore diameter of from 20 to 40 &mgr;m, and the catalytic layer having uneven surfaces is used. Since the second catalyst support hardly enters into the pore with a diameter of 20 &mgr;m or less, it exists partly on the filter cellular walls and the inside surface of the wall. Therefore, since PMs collide with the convex part of the catalytic layer, it becomes possible to collect them easily and the collecting rate for PMs and the ability of PMs purification are improved.

Abstract: A filter catalyst is for purifying exhaust gases emitted from internal combustion engines and including particulates, and includes a wall-flow honeycomb structure and an upstream-side straight honeycomb structure. The wall-flow honeycomb structure includes inlet cells clogged on the downstream side of the exhaust gases, outlet cells neighboring the inlet cells and clogged on the upstream side of the exhaust gases, filter cellular walls demarcating the inlet cells and the outlet cells and having pores, and a catalytic layer formed on the surface of the filter cellular walls and/or the surface of the pores of the filter cellular walls. The upstream-side straight honeycomb structure is disposed on the upstream side of the exhaust gases with respect to the wall-flow honeycomb structure, is provided integrally with the wall-flow honeycomb structure, and includes upstream-side straight cells in which the exhaust gases flow straight, and upstream-side cellular walls demarcating the upstream-side straight cells.

Abstract: According to the method of the present invention, NO (nitrogen monoxide) in the exhaust gas of a diesel engine is first oxidized to NO.sub.2 (nitrogen dioxide) by an oxidizing catalyst. Further, carbon particles in the exhaust gas are trapped by a DPF (diesel particulate filter). The exhaust gas containing NO.sub.2 formed by oxidation of nitrogen monoxide is, then, fed to the DPF, and NO.sub.2 in the exhaust gas reacts with the carbon particles trapped in the DPF. When the NO.sub.2 reacts with carbon particles, carbon particles are oxidized (burned) by NO.sub.2 and removed from DPF, and, at the same time, NO.sub.2 is reduced to NO by the carbon particles. The exhaust gas containing NO formed by the reaction between the carbon particles and NO.sub.2 is fed to an NO.sub.X absorbent. In the NO.sub.X absorbent, NO is absorbed by the NO.sub.X absorbent and, thereby, removed from the exhaust gas. Therefore, according this method, the carbon particles collected by the DPF can be easily burned by NO.sub.