Abstract:
A process for preparing impregnated substantially spherical alumina-containing particles comprises the steps of impregnating specific starting material with (NH.sub.4).sub.2 SO.sub.4 and then heating the thus impregnated material at about 500.degree.-900.degree. C. for improved crush strength retention. In a preferred embodiment a fixed catalyst bed comprises at least one layer of the alumina-containing particles and at least one layer of catalyst particles comprising a refractory inorganic carrier and at least one hydrogenation promoter.
Abstract translation:制备浸渍的基本上呈球形的含氧化铝颗粒的方法包括以下步骤:用(NH 4)2 SO 4浸渍特定原料,然后在约500-900℃下加热所浸渍的材料,以改善压碎强度保留。 在优选的实施方案中,固定的催化剂床包括至少一层含氧化铝的颗粒和至少一层包含耐火无机载体和至少一种氢化促进剂的催化剂颗粒层。
Abstract:
An H-Coal Process hydrogenation operation and catalyst life is substantially improved when using colloidal particles of catalyst comprising a colloidal matrix of silica, alumina, titania and combinations thereof coated with hydrogenating components selected from cobalt, molybdenum, nickel, tungsten and combinations thereof. The colloidal catalyst activity may be altered by alkaline promoters, other metals and acidic promoters.
Abstract:
A plate or hollow cylinder of coarsely porous graphite is coated with a layer of finely porous activated carbon that has previously been heat-treated. The fine layer is impregnated with a catalyst either before or after application to the graphite body. A gas is caused to flow through the graphite body and out through the finely porous layer containing the catalyst, to react with substances in a solution in which the carrier body is immersed. For oxidation, air can be used, and for reduction, hydrogen. In this manner, sulfite can be oxidized or chromate reduced and hydrogen gas can also be used to precipitate platinum, rhodium, copper and other metals from solution. Electro-chemical activation or regeneration of the catalyst is possible by applying a potential to the carrier body. The reaction can be carried on in solutions in which solids are suspended without clogging the catalyst.
Abstract:
Fine grain or fibrous solid active particles are immobilized in an areal or flat, flexible stratified body. The active particles serve for treating a liquid or gaseous medium circulating between the stratified body and the surroundings. The treatment, among other things, encompasses the sorption of substances, if desired, followed by desorption for regenerating the active particles, the emission of substances, the ion exchange and the catalysts of chemical reactions. The active substances or particles are enclosed between a base or substratum layer and a fiber-containing cover layer. Both layers are held together by means of holding fibers which are densely distributed over the entire surface and simultaneously anchored in both layers, whereby at the same time there are also immobilized the active particles. According to a preferred method the holding fibers are removed from the cover layer by fiber-orienting needles.
Abstract:
Beta-spodumene ceramic articles such as gas turbine regenerators are rendered more resistant to attack by moist sulfur oxidecontaining gases such as the exhaust gases from certain hydrocarbon combustion processes by providing a protective layer of fluorinated ethylene-propylene copolymer thereon.
Abstract:
A ring-shaped catalyst may have a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.
Abstract:
Catalyst particles comprising one or more active metal components and methods for manufacturing such catalyst particles are provided. The particles are a composite of a granulating agent or binder material such as an inorganic oxide, and an ultra-stable Y (hereafter “USY”) zeolite in which some of the aluminum atoms in the framework are substituted with zirconium atoms and/or titanium atoms and/or hafnium atoms. The one or more active phase components are incorporated prior to mixing the binder with the post-framework modified USY zeolite, extruding the resulting composite mixture, and forming the catalyst particles. The one or more active phase components are incorporated in the binder material prior to forming the catalyst particles.
Abstract:
An alkali metal ion modified titanium silicalite zeolite TS-1 for gas phase epoxidation of propylene and hydrogen peroxide and a preparation method thereof. The method includes: 1: preparing an alkali metal hydroxide modification solution containing a small amount of TPA+ ions; 2: conducting a controlled hydrothermal treatment on a TS-1 zeolite matrix by using the alkali metal hydroxide solution containing a small amount of TPA+ ions; and 3: conducting post-treatment on the hydrothermally modified TS-1 zeolite. In the washing process, the modified TS-1 zeolite wet material is washed with a low concentration alkali metal hydroxide solution; and alkali metal ions are reserved on the silicon hydroxyl of the modified titanium silicalite zeolite. The prepared alkali metal ion modified titanium silicalite zeolite has significantly improved catalytic performance in the gas phase epoxidation of propylene and hydrogen peroxide.
Abstract:
The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina having a broad pore size distribution (BPSD), and a second HNPV alumina having narrow pore size distribution (NPSD). Their combination yields a HNPV base extrudate having a low particle density as compared to a conventional base extrudates.
Abstract:
The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina having a broad pore size distribution (BPSD), and a second HNPV alumina having narrow pore size distribution (NPSD). Their combination yields a HNPV base extrudate having larger porosity with a bimodal pore size distribution as compared to a conventional base extrudates.