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    • 89. 发明申请
    • STORAGE CATALYST
    • 存储催化剂
    • WO98056492A1
    • 1998-12-17
    • PCT/EP1998/003252
    • 1998-05-30
    • B01D53/94B01J23/00B01J23/80B01J23/89F01N3/08
    • F01N3/0842B01D53/9422B01D2255/1023B01D2255/2042B01D2255/2047B01D2255/20707B01D2255/20723B01D2255/20761B01D2255/20776B01D2255/2092B01D2255/50B01D2255/91B01J23/005B01J23/80F01N3/0814Y10S502/524
    • The invention relates to a storage catalyst for a flow of waste gases, especially of a combustion engine operating alternately on lean and rich fuel, preferably a diesel engine or a lean mixture engine, or for the waste gases of a combustion plant. The inventive catalyst comprises a constituent which is capable of catalytic reduction of nitric oxides at least in the presence of hydrocarbons, and a constituent which stores NOx at least below 100 DEG C. The catalytic constituent has the general chemical formula AaBbO4, wherein A is one or several bivalent metals, B is one or several trivalent metals, a + b 0. Said catalytic constituent also has at least microscopically a crystalline or crystal-like cubic grid structure with face-centred oxygen ions and tetrahedral or octahedral vacancies. The A-particles and up to 50 % of the B-particles are situated in said tetrahedral vacancies and the rest of the B-particles are situated in said octahedral vacancies. The reaction enthalpy or the chemical activity between the catalytic constituent and the NOx storage constituent is low at least up to temperatures of 600 DEG C, preferably 800 DEG C.
    • 本发明涉及一种用于排气系统中的存储催化转化器,特别是电动交替贫和富燃烧发动机,优选为柴油发动机或稀混合气发动机,或燃烧设备的与在烃类中的氮氧化物成分的存在的至少一个催化还原作用的废气,和具有至少低于100 ℃下的NO x存储组件。 催化活性组分具有化学通式AaBbO4,其中A是一种或多种二价金属和B的一种或多种三价金属,并且其中a + b 0。 此外,催化活性组分,至少显微镜,结晶或晶体状立方晶格结构具有面心排列的氧离子和四面体和八面体的间隙,其中,所述四面体间隙中,A颗粒和至多B颗粒的50%,并且其中所述八面体的间隙中,剩余的 B-粒子配置。 此外,反应焓和催化活性组分和NOx存储组件,至少高达600℃的温度至800℃,优选为低之间的化学活性。