| 摘要 |
Described is catalyst that is active and selective for reducing to molecular nitrous oxides contained in a superstoichiometric medium of oxidizing agents, said reduction being conducted with agents such as carbon monoxide, hydrogen, hydrocarbons, alcohols, ethers, and other oxidized organic compounds and also with ordinary fuels such as gasolines, gas oils, liquefied gases, and compressed natural gases, whereby said catalyst comprises: at least one refractory inorganic oxide, including alumina; at least one element (A) that belongs to the group of rare earths; at least one element (B) that belongs to groups VIB, VIIB, VIII and IB of transition metals; at least one metal (C) that belongs to the group of precious metals of the platinum family, and optionally at least one element (D) that belongs to group IIA of alkaline-earths; at least a portion of elements (A) is combined with alumina to form at the surface of the latter a microlayer of rare-earth aluminate.
|
