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    • 10. 发明授权
    • Process using catalysts for selective catalytic reduction denox
technology
    • 使用催化剂进行选择性催化还原技术的工艺
    • US4975256A
    • 1990-12-04
    • US417141
    • 1989-10-04
    • Louis HegedusJean W. BeeckmanWie-Hin PanJeffrey P. Solar
    • Louis HegedusJean W. BeeckmanWie-Hin PanJeffrey P. Solar
    • B01D53/86B01J21/06B01J35/10
    • B01J21/063B01D53/8628B01J21/06B01J35/002B01J35/10B01J35/1019
    • Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials or some inorganic oxide prior to forming the titania into the formed support. Alternatively, titania is precipitated onto a porous inorganic oxide such as SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, AlPO.sub.4, Fe.sub.2 O.sub.3 and B.sub.2 O.sub.3 to form the support. Then conventional DeNOx catalytic metals are added. The support can be made by first impregnating the inorganic oxide particles with titania via a soluble precursor, forming titania and then shaping the coated particles into the desired shape such as a monolith. In a second embodiment, the inorganic oxide particles are first formed into the desired shape and then impregnated with the titania forming material. Barium sulfate can be added to the surface of the porous inorganic oxide to make an improved support.
    • 用于由氨选择性催化还原NOx的催化剂由具有孔径大于600埃单位的孔的一定部分的多孔成形载体制成。 因此,在将二氧化钛形成到形成的载体之前,可以通过添加烧制材料或一些无机氧化物将大孔引入形成的TiO 2载体中。 或者,二氧化钛沉淀到诸如SiO 2,Al 2 O 3,ZrO 2,AlPO 4,Fe 2 O 3和B 2 O 3的多孔无机氧化物上以形成载体。 然后加入常规的DeNOx催化金属。 可以通过首先通过可溶性前体用二氧化钛浸渍无机氧化物颗粒,形成二氧化钛,然后将涂覆的颗粒成形为期望的形状如整料来制备载体。 在第二实施方案中,首先将无机氧化物颗粒形成为所需形状,然后用二氧化钛形成材料浸渍。 可以将硫酸钡加入到多孔无机氧化物的表面以形成改进的载体。