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:
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.
摘要:
A device for the containment of ceramic catalyst monoliths particularly of four cornered cross sectional area as well as for the combination of a plurality thereof into a package. The device includes elastic gaskets arranged on one of the ends of the monoliths and partitions for the form fitting containment of the elements into a cassette.
摘要:
An improved lambda sensor is disclosed for the measurement of the oxygen content in the exhaust gas of internal combustion engines in which the sensor element is provided with a gas permeable wrapping coated with a catalyst. The sensor delivers a clear well defined signal in the so-called rich exhaust gas, which makes possible a more precise adjustment of the fuel-air mixture fed to the internal combustion engine.
摘要:
Baffle means coated with effective catalyts are positioned inside exhaust pipes to convert the harmful substances in said exhaust gases into harmless components. The baffle means impart a disturbed flow and/or change of the direction of flow of the exhaust gases in the exhaust pipe.
摘要:
There are provided shaped catalysts, particularly for the formation and/or equipping of reaction chambers with catalytically active surfaces, consisting of a structural reinforcing agent of ferrous metal, a layer of a heat resistant carrier material on the structural reinforcing agent as well as a catalytically active component on the carrier material; the body of the structural reinforcing agent consists of iron or steel and its surface is provided with a nonscaling, adhesive and anchoring enhancing aluminum/iron diffusion layer obtained by a tempering of aluminum coated iron or steel at a temperature between 600.degree. and 1200.degree. C. for at least one minute. There is also disclosed a process for making the catalysts.