Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Sulfur or compound containing same
Patent
1988-06-09
1990-05-29
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Sulfur or compound containing same
502236, 502239, 502241, 502242, 502247, 502309, 502324, B01J 2100, B01J 2316, B01J 2702
Patent
active
049295861
ABSTRACT:
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 made an improved support.
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Beeckman Jean W.
Hegedus Louis
Pan Wie-Hin
Solar Jeffrey P.
Cabic Edward J.
Dees Carl F.
W. R. Grace & Co.,-Conn.
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