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    • 4. 发明授权
    • Nitrogen oxide removal catalyst
    • 氧化氮去除催化剂
    • US5869419A
    • 1999-02-09
    • US871520
    • 1997-06-09
    • Yoshiaki ObayashiKozo IidaShigeru NojimaAtsushi MoriiOsamu Naito
    • Yoshiaki ObayashiKozo IidaShigeru NojimaAtsushi MoriiOsamu Naito
    • B01D53/86B01D53/94B01D53/96B01J23/30B01J37/02B01J38/00B01J23/00B01J8/00B01J23/16
    • B01J38/00B01D53/8628B01D53/8631B01J23/30B01J37/0244
    • This invention effectively utilizes a solid type honeycomb-shaped NO.sub.x removal catalyst which has been used in a catalytic ammonia reduction process and hence reduced in NO.sub.x removal power, and thereby provides an inexpensive catalyst having NO.sub.x removal power equal to that of a fresh catalyst. The nitrogen oxide removal catalyst of this invention, which is useful in a process wherein ammonia is added to exhaust gas and nitrogen oxides present in the exhaust gas are catalytically reduced, has a two-layer structure composed of a lower layer comprising a spent solid type nitrogen oxide removal catalyst and an upper layer comprising a fresh TiO.sub.2 -WO.sub.3 -V.sub.2 O.sub.5 ternary or TiO.sub.2 -WO.sub.3 binary catalyst powder which has been applied to the lower layer so as to give a coating thickness of 100 to 250 .mu.m. Moreover, the catalyst power constituting the upper layer is a catalyst powder obtained by pulverizing a spent solid type nitrogen oxide removal catalyst.
    • 本发明有效地利用了催化氨还原方法中使用的固体型蜂窝状NOx去除催化剂,从而降低了NOx去除能力,从而提供了具有等于新鲜催化剂的NOx去除功率的便宜的催化剂。 本发明的氮氧化物去除催化剂可用于将排放气体中存在氨和排出气体中存在的氮氧化物的方法进行催化还原的方法中,具有由下层构成的二层结构,该下层由废固体型 氮氧化物去除催化剂和上层,其包含新的TiO 2 -WO 3-V 2 O 5三元或TiO 2 -WO 3二元催化剂粉末,其被施加到下层以使涂层厚度为100-250μm。 此外,构成上层的催化剂功率是通过粉碎废固体型氮氧化物去除催化剂而获得的催化剂粉末。
    • 9. 发明申请
    • Flue gas denitration catalyst and preparation process thereof
    • 烟气脱硝催化剂及其制备方法
    • US20050054523A9
    • 2005-03-10
    • US10705365
    • 2003-11-10
    • Shigeru NojimaKozo IidaYoshiaki ObayashiKatsumi NochiMasashi Kiyosawa
    • Shigeru NojimaKozo IidaYoshiaki ObayashiKatsumi NochiMasashi Kiyosawa
    • B01D53/94B01D53/86B01J23/00B01J23/30B01J35/04B01J37/02
    • B01D53/8631B01D53/8628B01J23/002B01J23/30B01J35/04B01J37/0238
    • Provided are a flue gas denitration catalyst having high denitration activity and capable of suppressing a side reaction, that is, oxidation of SO2; and a preparation process of the catalyst. The flue gas denitration catalyst comprises TiO2, WO3 and V2O5. In the surface layer of the catalyst within 200 μm from the surface thereof, V2O5 is supported on a carrier containing TiO2 and WO3. The supported amounts of V2O5 range from 0.4 to 5 wt. % based on the weight of the surface layer and range from 0.1 to 0.9 wt. % based on the total weight of the catalyst. The V2O5 thus supported has a crystallite size of less than 10 nm as measured by X-ray diffraction. The catalyst can be available by preparing a mixture containing TiO2 and WO3 and having V2O5 supported on the surface of an extruded product of the prepared mixture by a vapor phase method. The catalyst can be also available by having V2O5 supported on a powder of the prepared mixture by a vapor phase method and having the resulting powder supported on the surface of a formed product.
    • 本发明提供一种脱硝活性高,能够抑制副反应即SO2氧化的烟道气脱硝催化剂。 和催化剂的制备方法。 烟气脱硝催化剂包括TiO 2,WO 3和V 2 O 5。 在催化剂的表面200μm以内的表面层中,将V 2 O 5负载在含有TiO 2和WO 3的载体上。 V2O5的负载量为0.4〜5wt。 %,基于表层的重量,为0.1-0.9wt。 %,基于催化剂的总重量。 如此支持的V 2 O 5通过X射线衍射测得的微晶尺寸小于10nm。 催化剂可以通过制备含有TiO 2和WO 3的混合物并且通过气相法将V 2 O 5负载在所制备的混合物的挤出产品的表面上来获得。 催化剂也可以通过使V 2 O 5通过气相法在制备的混合物的粉末上负载并将所得粉末负载在成形产品的表面上来获得。