摘要:
A process is described for the purification of exhaust gases containing oxides of nitrogen and sulfur obtained from combustion installations and industrial production processes by selective catalytic reduction of the nitric oxides with ammonia, subsequent catalytic oxidation of sulfur dioxide with oxygen and conversion into sulfuric acid of the sulfur trioxide obtained.
摘要:
A catalyst process is disclosed for the reduction of the ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines by passing the exhaust gas over a catalytically active substance, which is selected from lithium oxide, copper chloride, vanadium oxide/alkali metal oxide combinations, a vanadate of an alkali metal or of cerium, or a silver or alkali metal perrhenate, preferably of sodium or silver, or mixtures of these substances.
摘要:
A catalyst is disclosed for combustion of pollutants contained in the exhaust gases of internal combustion engines operated with alcohol. The catalyst consists of a metal carrier, a coating deposited on it made of a catalytically active aluminum oxide and an amount of palladium deposited on said coating. A production process for the catalyst is described which provides a final activation in oxidizing atmosphere or a formation in the stream of the exhaust gas that is to be purified at certain temperatures as well as the use of the catalyst for the simultaneous elimination of aldehydes, alcohols, carbon monoxide and hydrocarbons present in the exhaust gas.
摘要:
A process for applying a coating containing platinum and/or palladium to the surface of a porous catalyst carrier, the depth of penetration being controlled by preloading the carrier with a determined amount of aqueous solution containing ammonium chloride.
摘要:
In a monolithic carrier catalyst containing a catalytically active substance for the purification of a stream of exhaust gases from an internal combustion engine, the improvement comprises providing an increasing concentration of catalytically active substance on the monolithic carrier catalyst, wherein the concentration increases in the direction of flow of the exhaust gases. The catalyst is particularly useful in oxidizing and/or reducing the noxious substances in automotive exhaust gases.
摘要:
An improvement in producing an adherent metal oxide coating on a solid body comprises incorporating a nitrogen-containing polymer in a dispersion of the metal oxide into which the body is dipped. The pH of the dispersion is controlled in order to stabilize the dispersion. The body can then be dried. The invention is especially useful for applying a metal oxide coating to a ceramic material employed as a catalyst carrier for automotive exhaust gas purification.
摘要:
Catalysts suitable for the oxidation of ammonia to nitrogen oxides which are suitable to produce nitric acid are prepared by doping cobalt oxide, preferably Co.sub.3 O.sub.4 with 0.1-10 atoms %, preferably 0.5-3 atom % of lithium. In a given case, there is added a mold assist agent to form tablets, spheres, extruded pressed strands or honeycombs. The product is calcined in air or an oxygen stream at 300.degree.-700.degree.C, preferably 400.degree.-600.degree.C and subsequently tempered at 700.degree.-900.degree.C in a reactive gas mixture of air and 8-10 vol. % ammonia to increase the form stability.
摘要翻译:通过掺杂氧化钴,优选具有0.1-10原子%,优选0.5-3原子%的锂的Co 3 O 4,制备适于氧化氨至适于生产硝酸的氮氧化物的催化剂。 在给定的情况下,加入模具助剂以形成片剂,球体,挤出的挤压的丝束或蜂窝。 产物在空气或氧气流中在300〜700℃,优选400〜-600℃下煅烧,随后在空气和8〜10体积的反应性气体混合物中于700-900℃回火。 %氨增加形式稳定性。
摘要:
A catalyst is described made of active aluminum oxide with additives of CeO.sub.2, ZrO.sub.2, and Fe.sub.2 O.sub.3 and/or NiO as carrier and an active phase, applied thereon and consisting of platinum, palladium and/or rhodium, and a base metal, which is obtainable by impregnation of the additive-containing carrier with solutions of salts of the metals for the active phase, wherein the base metal of the active phase is cerium, by drying, and by heating to 250.degree. to 650.degree. C. The catalyst can be used for the oxidation and/or reduction of exhaust gases from internal combustion engines.
摘要翻译:催化剂由具有CeO 2,ZrO 2和Fe 2 O 3和/或NiO作为载体的添加剂和施加在其上并由铂,钯和/或铑和贱金属组成的活性相的活性氧化铝制成,其可获得 通过用活性相的金属盐溶液浸渍含添加剂的载体,其中活性相的贱金属是铈,通过干燥,加热至250〜650℃。可以使用催化剂 用于氧化和/或还原来自内燃机的废气。
摘要:
A catalyst for the production of hydrocarbon consists essentially of crystalline aluminum silicate, at least one compound of the metal zinc and/or cadmium and additionally silica. The catalyst is produced by heating a crystalline aluminum silicate, in a given case partially or completely converted to the hydrogen form, with a zinc and/or cadmium compound and molding with a silica containing binder.