Abstract: A high heat-resistant catalyst support comprises an amorphous composite oxide which is constituted by:(i) an NOx storage component comprising an oxide of at least one element selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements,(ii) alumina (Al.sub.2 O.sub.3); and(iii) at least one element selected from the group consisting of titania (TiO.sub.2), zirconia (ZrO.sub.2) and silica (SiO.sub.2).Furthermore, TiO.sub.2, ZrO.sub.2 and SiO.sub.2 are acidic, and at least one element selected from the group consisting of TiO.sub.2, ZrO.sub.2 and SiO.sub.2 is highly dispersed to form composite. So, SOx having acidity is prevented from approaching the NOx storage component, and sulfur poisoning is prevented. Moreover, bonding force of the NOx storage component to the catalyst support strengthens, and the NOx storage component is prevented from being scattered.

Abstract: This catalyst support aims to improve heat resistant and durability by highly dispersing an NO.sub.x storage component. This catalyst support is produced by mixing a solution of a chemical compound including at least one element of alkali metals, alkaline-earth metals, and rare-earth elements with a solution of oxide sol of at least one metal of group IIIb, group IVa, and group IVb in the periodic table to prepare a mixed sol solution, forming the mixed sol solution into gel, and drying and calcining the gel. The obtained catalyst support is amorphous and attains a high specific surface area even when calcined at elevated temperatures, so that the catalyst support is superior in heat resistance.

Abstract: The present invention relates to a catalyst for purifying an exhaust gas, and in particular provides a catalyst for purifying an exhaust gas using a complex oxide, which is not deteriorated in its purifying performance even in a lean atmosphere containing sulfur dioxide SO.sub.2 at temperatures as high as at least 1,000.degree. C., comprising at least one of the noble metals and one or at least two elements selected from the group consisting of alkaline earth metals and Group IIIA elements, and at least one member selected from the group consisting of iron, nickel and cobalt is supported in the surface portion of the catalyst, the catalyst further comprising, as a constituent element of the complex oxide, at least one element selected from the group consisting of iron, nickel and cobalt.

Abstract: This invention relates to a catalyst for purifying an exhaust gas using a complex oxide having good heat-resistant and a purification performance which does not undergo degradation, particularly in a lean atmosphere at a high temperature of about 1,000.degree. C., by using the complex oxide containing platinum and at least one member of element selected from the group from an alkaline earth metal element and the Group IIIA element and, furthermore, by using at least one member of platinum complex oxides selected from the group of those Pt complex oxides expressed by the chemical structural formulas X.sub.4 PtO.sub.6 (X=Ca, Sr, Ba, Mg), X'.sub.2 Pt.sub.2 O.sub.7 (X'=Sc, La, Pr), SrX"PtO.sub.6 (X"=Co, Ni, Cu), Ba.sub.2 ZPtO.sub.6 (Z=Pr, Ce) and Ba.sub.8 Y.sub.3 Pt.sub.4 O.sub.17.5.

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.

Abstract: An NO.sub.x absorber (18) is arranged in an exhaust passage of an internal combustion engine. The NO.sub.x absorber (18) absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorber (18) is lean while releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorber (18) becomes the stoichiometric air-fuel ratio or rich. An air-fuel ratio sensor (22) is arranged in the exhaust passage downstream of the NO.sub.x absorber (18). When the air-fuel ratio detected by the air-fuel ratio sensor (22) is switched from lean to rich after the air-fuel ratio of the exhaust gas flowing into NO.sub.x absorber (18) is switched from lean to rich, it is decided that the releasing action of NO.sub.x from the NO.sub.x absorber (18) is completed.

Abstract: A shaped body is molded from fine particles such as powder, whiskers and short fibers, by preparing a slurry consisting of the fine particles and a supercritical fluid containing a small amount of binder dissolved therein, and supplying the slurry into a mold cavity through an inlet port, so that the fine particles suspended in the supercritical fluid are stacked in the cavity to form a layer as the supercritical fluid is exhausted out of the mold cavity through an outlet port.

Abstract: A shaped body is formed from fine particles such as powder, whiskers or short fibers of ceramics or metal, by preparing a mold having a mold chamber, an inlet port open to the mold chamber at its first portion and adapted to introduce a mixture of the fine particles and a carrier fluid into the mold chamber, and an outlet port open to the mold chamber at its second portion substantially opposite to the first portion and adapted to exhaust substantially only the carrier fluid in a gaseous state out of the mold chamber; preparing the mixture of the fine particles and the carrier fluid; and supplying the mixture under a pressure elevated substantially above atmospheric pressure into the mold chamber through the inlet port while exhausting the carrier fluid out of the mold chamber through the outlet port.

Abstract: Ceramics adapted to be enveloped in a casting having a cumulative particle size distribution such that the percentage of particles with sizes of less than 44.mu. lies within the range of 14.5-50% and the balance consists of particles the maximum size of which ranges from 500-2,000.mu., in order to produce vibration-resistant ceramic parts which may be enveloped in a casting.

Abstract: Low-soda alumina granules suitable for use as an alumina porcelain insulator and alumina catalyst carrier, and the method and equipment for their manufacture. The method comprises dehydrating aluminum hydroxide at a high temperature and then granulating it. The granules thus obtained are placed in an autoclave, washed and cured with water drops, then taken out of the autoclave dried and fired. The manufacturing equipment is used for curing the granules with water drops.

Abstract: Foamed sodium silicate ceramic obtained by mixing sodium silicate 30-36% by weight of aluminum hydroxide or 30-36% by weight of aluminum hydroxide and 5-20% by weight of ceramic fibers; and method of manufacturing the same.

Abstract: Method of manufacturing a catalyst type exhaust gas purifier utilizing a divisible vessel to hold an integrated catalyst, while a packing is inserted at the junction between the divisible parts. The space between the vessel and the catalyst is filled with a castable refractory material, which is then solidified, after which the packing is removed and then the parts of the vessel are drawn together at said junction.

Abstract: Method of filling a casing with heat insulating fibers in which a fibrous heat insulating mass of fixed size is inserted into a space to be filled by vacuum-packing the fibrous mass in a vacuum-resistant bag, which may then be wrapped about an inner cylinder, introducing the bag into an outer cylinder and, after breaking the vacuum seal, allowing the fibrous mass to swell and fill any space within the outer cylinder not occupied by said inner cylinder, if any.