Method for the reduction of nitrogen oxides
    6.
    发明授权
    Method for the reduction of nitrogen oxides 有权
    还原氮氧化物的方法

    公开(公告)号:US6153162A

    公开(公告)日:2000-11-28

    申请号:US331059

    申请日:1999-06-16

    摘要: A process for the catalytic reduction of NO.sub.x, the reduction taking place in the presence of a catalyst which comprises(a) from 20 to 97 wt % of A.sub.2 O.sub.3,(b) from 1 to 40 wt % of CuO,(c) from 1 to 50 wt % of ZnO,(d) from 1 to 40 wt % of Ag,(e) from 0 to 2 wt % of Pt,(f) from 0 to 20 wt % of oxides of rare earth metals, elements of the 3rd subgroup of the Periodic Table of the Elements or mixtures thereof,based on the total weight of the components (a) to (e), which adds up to 100 wt %, wherein, in each case, up to half the weight of the component (a) may be replaced by Fe.sub.2 O.sub.3, Cr.sub.2 O.sub.3, Ga.sub.2 O.sub.3 or mixtures thereof, of the component (b) by CoO, of the component (c) by MgO, of the component (d) by Au and of the component (e) by Pd, Ru, Os, Ir, Rh, Re or mixtures thereof, is used for reducing NO.sub.x, especially in combustion off-gases, the components (a), (b) and (c) forming a spinel which is doped with the components (d), (e) and (f).

    摘要翻译: PCT No.PCT / EP97 / 07091 Sec。 371日期1999年6月16日第 102(e)日期1999年6月16日PCT 1997年12月17日PCT公布。 第WO98 / 26858号公报 日期1998年6月25日催化还原NOx的方法是在催化剂存在下进行还原,该催化剂包含(a)20至97重量%的A 2 O 3,(b)1至40重量%的CuO, (c)1〜50重量%的ZnO,(d)1〜40重量%的Ag,(e)0〜2重量%的Pt,(f)0〜20重量%的稀土氧化物 金属,元素周期表第3族的元素或其混合物,基于组分(a)至(e)的总重量,其加起来为100重量%,其中在每种情况下,至多 组分(a)的重量的一半可以被组分(b)的组分(b)由CoO,组分(c)的MgO,组分(d)的Au和Au和 使用Pd,Ru,Os,Ir,Rh,Re或其混合物的组分(e)用于还原NOx,特别是在燃烧废气中,形成尖晶石的组分(a),(b)和(c) 其掺杂有组分(d),(e)和(f)。

    Process for reducing NO.sub.x from exhaust fumes
    9.
    发明授权
    Process for reducing NO.sub.x from exhaust fumes 失效
    从废气中还原NOx的方法

    公开(公告)号:US6153161A

    公开(公告)日:2000-11-28

    申请号:US77597

    申请日:1998-06-02

    摘要: NO.sub.x, where x is 1 and 2, in exhaust gases is reduced over heterogeneous catalysts with hydrocarbons, carbon monoxide, hydrogen or mixtures thereof in the presence of oxygen from 100 to 650.degree. C. and an absolute pressure of from 0.5 to 50 bar by a process in which the heterogeneous catalysts used are bimodal or polymodal compounds of the general formula IA.sub.1-x M.sub.2 O.sub.4 (I),which, if required, are doped with rare earth metals, noble metal, titanium, vanadium, molybdenum, tungsten or mixtures thereof, and whereA is magnesium, calcium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, tin or mixtures thereof,M is aluminum, gallium, indium, tin, chromium, manganese, iron, cobalt, nickel, copper, zinc or mixtures thereof andx is from 0 to 0.99,whose oxygen atoms are in a cubic close packed arrangement and A is present in the tetrahedral sites and M in the octahedral sites, it also being possible for A to occupy octahedral sites if an equivalent amount of M occupies tetrahedral sites.

    摘要翻译: PCT No.PCT / EP96 / 05532 Sec。 371日期1998年6月2日 102(e)1998年6月2日PCT 1996年12月11日PCT PCT。 公开号WO97 / 21482 日期1997年6月19日NO x,其中x为1和2,在100至650℃的氧气存在下,在具有烃,一氧化碳,氢气或其混合物的非均相催化剂中,废气中的x 1和 0.5〜50巴,其中所用的非均相催化剂是通式IA1-xM2O4(Ⅰ)的双峰型或多模态化合物,如果需要,它们掺杂有稀土金属,贵金属,钛,钒,钼, 钨或其混合物,其中A为镁,钙,钛,钒,铬,锰,铁,钴,镍,铜,锌,锡或其混合物,M为铝,镓,铟,锡,铬,锰, 铁,钴,镍,铜,锌或其混合物,x为0至0.99,其氧原子为立方密堆积排列,A存在于四面体位置,M位于八面体位置, A占据八面体网站如果一个等同的amou m的m位于四面体位置。