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    • 3. 发明申请
    • Catalyst and Method for Catalytic Reduction of Nitrogen Oxides
    • 用于催化还原氮氧化物的催化剂和方法
    • US20070274889A1
    • 2007-11-29
    • US10578664
    • 2004-11-08
    • Tadao NakatsujiNorio SuzukiHiroshi OhnoNaohiro SatoTomoko MoritaKatsuji Wada
    • Tadao NakatsujiNorio SuzukiHiroshi OhnoNaohiro SatoTomoko MoritaKatsuji Wada
    • B01D53/56B01J23/652B01J29/22B01J29/24B01J29/76
    • B01D53/9422B01D2255/102B01D2255/20B01D2255/206B01J23/652B01J29/7415B01J29/7615B01J29/7815B01J35/0006
    • The invention provides a catalyst for catalytic reduction of nitrogen oxides contained in exhaust gases wherein fuel is supplied and subjected to combustion under periodic rich/lean conditions and the resulting exhaust gases are brought into contact therewith, which catalyst comprises: (A) a catalyst component A comprising (c) ceria or (d) praseodymium oxide or (e) an oxide and/or a composite oxide of at least two elements selected from the group consisting of cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum; (B) a catalyst component B comprising (d) a noble metal catalyst component selected from the group consisting of platinum, rhodium, palladium and oxides thereof and (e) a carrier; and (C) a catalyst component C comprising (f) a solid acid, and (g) a solid acid supporting an oxide of at least one element selected from the group consisting of vanadium, tungsten, molybdenum, copper, iron, cobalt, nickel and manganese. The catalyst reduces NOx contained in exhaust gases wherein fuel is supplied and subjected to combustion with a periodic rich/lean excursions, whereby NOx is generated in the exhaust gases, with high durability in a wide temperature range even in the presence of oxygen, sulfur oxides or water.
    • 本发明提供一种用于催化还原废气中所含的氮氧化物的催化剂,其中燃料在周期性富/贫条件下被供应并经历燃烧,并使得到的废气与其接触,该催化剂包括:(A)催化剂组分 A包括(c)二氧化铈或(d)氧化镨或(e)选自铈,锆,镨,钕,铽,钐,钆和镧中的至少两种元素的氧化物和/或复合氧化物 ; (B)催化剂组分B,其包含(d)选自铂,铑,钯及其氧化物的贵金属催化剂组分和(e)载体; 和(C)包含(f)固体酸的催化剂组分C,和(g)支持选自钒,钨,钼,铜,铁,钴,镍, 和锰。 催化剂还原废气中所含的NOx,其中燃料被供给并经历周期性的富/贫漂移的燃烧,从而在废气中产生NOx,即使在存在氧,硫氧化物的情况下,在宽温度范围内具有高耐久性 或水。