摘要:
The reductive removal of nitrogen oxides from the exhaust gas from internal combustion engines operated predominantly under lean conditionstakes place in a selective catalytic reduction (SCR) of the nitrogen oxides by means of ammonia or a compound which can be decomposed into ammonia as reducing agent. Conventional SCR catalysts typically have a relatively narrow working temperature window, usually 350° C. to 520° C., in which good nitrogen oxide conversions can be achieved with sufficient selectivity. SCR catalyst formulations whose working window is in the temperature range from 150° C. to 350° C. generally not be used at higher temperatures since they oxidize the ammonia required as reducing 18 agent to nitrogen oxides at above 350° C. To cover the entire exhaust gas temperature range typical of vehicles having been operating internal combustion enginesextending from 200° C. to 600° C., it has therefore mostly been necessary to use complicated exhaust gas systemscontaining a plurality of catalysts having different working temperature ranges. Disclosed is a structured SCR catalyst whose working range extends over a significantly broader temperature window and by means of which complicated exhaust gas units can be considerably simplified, with a saving of components.
摘要:
The invention relates to a special device for the purification of diesel exhaust gases, which device comprises, in the flow direction of the exhaust gas, an oxidation catalyst, a diesel particle filter with catalytically active coating, and, downstream of a device for introducing a reducing agent from an external reducing agent source, an SCR catalyst. The oxidation catalyst and the catalytically active coating of the diesel particle filter contain palladium and platinum. The ratio of the noble metals platinum and palladium in the overall system and on the individual components, oxidation catalyst and catalytically coated diesel particle filter, are coordinated with one another in such a way as to obtain firstly an optimum NO/NO2 ratio in the exhaust gas upstream of the downstream SCR catalyst, and secondly optimum heating and HC conversion behaviour during an active particle filter regeneration.
摘要翻译:本发明涉及一种用于净化柴油机废气的专用装置,该装置在排气的流动方向上包括氧化催化剂,具有催化活性涂层的柴油颗粒过滤器,以及用于引入 还原剂来自外部还原剂源,SCR催化剂。 柴油颗粒过滤器的氧化催化剂和催化活性涂层含有钯和铂。 整个系统中的贵金属铂和钯与单个组分,氧化催化剂和催化涂层柴油颗粒过滤器的比例彼此协调,以便首先获得排气中最佳的NO / NO 2比例 下游SCR催化剂上游的气体,其次是活性颗粒过滤器再生过程中的最佳加热和HC转化行为。
摘要:
In order to provide a sink, comprising at least one basin, which is provided with a basin flange at its upper edge, a cover, which is fixed to the basin and at least partially covers the basin flange, and at least one holding element on the sink side, which cooperates with a holding element on the worktop side when the sink is fitted, in order to hold the sink on a worktop, in the production of which no after-treatment of visible faces of the sink is necessary and in which the cover can be freely designed and, in particular, can be configured without a dent, it is proposed that the holding element on the sink side is connected to the basin flange.
摘要:
A drive system includes a rotary drive unit for rotating a shaft and a linear drive unit for moving the shaft in a linear direction. To improve efficiency and shelf life, an energy storage is mechanically connected to the shaft for biasing the shaft to seek a linear movement in opposition to the linear direction. The energy storage absorbs the kinetic energy of the shaft and releases it again subsequently.
摘要:
In order to produce a packaging for a sink which has particularly good absorption properties and a low rate of transportation damage there is proposed a packaging for a sink which comprises at least one supporting body that is formed at least partly from a foamed plastic material and comprises at least one seating element incorporating a seating channel for an edge section of the sink, and an outer packaging whose interior accommodates the sink and the at least one supporting body, wherein the at least one supporting body extends over substantially the entire internal height of the interior of the outer packaging.
摘要:
The present invention provides a coating composition comprising one or more curable resins which contain, among the resins, free acrylic moieties and free or reacted epoxy moieties, and a ketone blocked polyamine type curing agent, the ingredients being chosen to provide in the coating after curing, more than 50% by weight of cured epoxy groups and less than 50% by weight of cured acrylic groups.