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    • 9. 发明授权
    • Selective catalytic reduction (SCR) of nitrogen oxides
    • 氮氧化物的选择性催化还原(SCR)
    • US5143707A
    • 1992-09-01
    • US735232
    • 1991-07-24
    • Jeffrey S. BeckRichard F. SochaDavid S. ShihabiJames C. Vartuli
    • Jeffrey S. BeckRichard F. SochaDavid S. ShihabiJames C. Vartuli
    • B01D53/94B01J29/04
    • B01J29/04B01D53/9418B01D2251/2062B01D2255/207B01D2255/20723
    • Emissions of nitrogen oxides (NO.sub.X) to the atmosphere are reduced by treatment of gases containing nitrogen oxides with a reducing agent such as ammonia in the presence of a catalyst containing a mesoporous crystalline catalyst. The mesoporous crystalline catalyst comprises an inorganic, non-layered, porous, crystalline phase aluminosilicate material which exhibits a benzene adsorption capacity of greater than about 15 grams benzene per 100 grams at 50 torr and 25.degree. C. In its preferred catalytic form, the crystalline material has a uniform, hexagonal arrangement of pores with diameters of at least about 13 .ANG. and exhibiting, after calcination, an X-ray diffraction pattern with at least on d-spacing greater than about 18 .ANG. and a hexagonal electron diffraction pattern that can be indexed with a d.sub.100 value greater than about 18 .ANG. which corresponds to at least one peak in the X-ray diffraction pattern.
    • 在含有介孔结晶催化剂的催化剂存在下,通过用还原剂如氨处理含氮氧化物的气体,可以减少氮氧化物(NO x)向大气中的排放。 介孔结晶催化剂包括无机,非层状,多孔,结晶相的硅铝酸盐材料,其在50乇和25℃下表现出大于约15克苯/ 100克的苯吸附能力。在其优选的催化剂形式中, 材料具有均匀的六边形排列的直径至少约为13的孔,并且在煅烧之后表现出至少在d-间距大于约18的X射线衍射图和六角形电子衍射图,其可以是 用对应于X射线衍射图中的至少一个峰的大于约18的d100值进行索引。