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    • 5. 发明授权
    • Method for the reduction of nitrogen oxides using iron impregnated
zeolites
    • 使用铁浸渍沸石还原氮氧化物的方法
    • US5520895A
    • 1996-05-28
    • US271693
    • 1994-07-07
    • Sanjay B. SharmaDavid S. Shihabi
    • Sanjay B. SharmaDavid S. Shihabi
    • B01D53/86B01D53/94B01J29/072B01J37/02C01B21/00
    • B01J37/0203B01D53/8621B01D53/865B01D53/9418B01J29/072B01D2251/2062B01D2255/20738B01D2255/50
    • There is provided a process for the treatment of exhaust gas, which process uses a specially prepared catalyst composition, for the selective catalytic reduction of NO.sub.x contained in the exhaust gas. An embodiment of the process of this invention comprises a catalytic stage to selectively catalytically reduce NO.sub.x over a catalyst composition comprising an intermediate pore size zeolite catalyst that has been treated with a water soluble iron salt or salt precursor in a way effective to maximize iron dispersion. The intermediate pore size zeolite of this invention preferably has a silica:alumina molar ratio of between about 20 and about 1000. The catalyst of this invention typically comprises a silica, titania, or zirconia binder, preferably a binder including a high molecular weight, hydroxyl functional silicone resin. The catalyst of this invention is preferably formed, e.g., extruded, and then simultaneously calcined and hydrothermally treated.
    • 提供了一种处理废气的方法,该方法使用特别制备的催化剂组合物来选择性催化还原废气中所含的NOx。 本发明方法的一个实施方案包括催化阶段,以催化还原催化剂还原催化剂组合物,该催化剂组合物包含中和孔径的沸石催化剂,该催化剂已经以有效使铁分散最大化的方式用水溶性铁盐或盐前体处理。 本发明的中等孔径沸石优选具有约20至约1000的二氧化硅:氧化铝摩尔比。本发明的催化剂通常包含二氧化硅,二氧化钛或氧化锆粘合剂,优选包含高分子量羟基的粘合剂 功能硅树脂。 本发明的催化剂优选形成例如挤出,然后同时进行煅烧和水热处理。
    • 7. 发明授权
    • Denitrification of flue gas from catalytic cracking
    • 烟气从催化裂化中脱氮
    • US5173278A
    • 1992-12-22
    • US669821
    • 1991-03-15
    • David O. MarlerAjit V. SapreDavid S. ShihabiRichard F. SochaScott A. Stevenson
    • David O. MarlerAjit V. SapreDavid S. ShihabiRichard F. SochaScott A. Stevenson
    • B01D53/86C10G11/18
    • B01D53/8625B01D53/8621C10G11/182B01D2257/408Y02P30/446
    • A flue gas that contains small amounts of both HCN and NO.sub.x, produced, for example, by catalyst regeneration in the fluid catalytic cracking of a petroleum gas oil, is readily denitrified by the catalyzed reaction that proceeds approximately according to:HCN+NO.fwdarw.N.sub.2 (gas)+CO+CO.sub.2 +H.sub.2 OIf the molar ratio of HCN to NO in the flue gas is about 1.0, e.g. in the range of about 0.8 to 1.2, effective denitrification is achieved without first changing the composition of the flue gas by contacting it with catalyst under conversion conditions including elevated temperature. If the molar ratio of HCN to NO exceeds 1.2, the ratio may be adjusted to about 1.0 to 1.1 by thermal or catalytic oxidation in the presence of oxygen gas, followed by catalytic denitrification. If the molar ratio is less than about 0.8, the effective molar ratio is adjusted to about 1.0 to 1.1 by adding NH.sub.3 gas, followed by denitirification. In all three instances an excessive content of carbon monoxide in the flue gas may be corrected by passing the denitrified flue gas to a CO-boiler.Catalysts for the denitrification reaction are described and exemplified by crystalline zeolites of the ZSM-5 type, and by vanadium oxide supported on titania.
    • 含有少量HCN和NOx的烟道气,例如通过在石油瓦斯油的流化催化裂化中的催化剂再生产生的烟气,可以通过大致按以下方式进行的催化反应脱氮:HCN + NO-> N2(气体)+ CO + CO2 + H2O如果烟气中HCN与NO的摩尔比为约1.0, 在约0.8至1.2的范围内,无需首先在包括升高的温度的转化条件下将催化剂与催化剂接触,而不改变烟道气的组成,实现有效的脱氮。 如果HCN与NO的摩尔比超过1.2,则在氧气存在下通过热或催化氧化将该比例调节至约1.0至1.1,然后进行催化反硝化。 如果摩尔比小于约0.8,则通过加入NH 3气体将有效摩尔比调节至约1.0-1.1,然后进行脱硝。 在所有三种情况下,可以通过将反硝化烟道气通过CO锅炉来校正烟道气中过量的一氧化碳。 用于脱氮反应的催化剂通过ZSM-5型的结晶沸石和负载在二氧化钛上的氧化钒来描述和例示。