Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs
Patent
1992-03-09
1993-05-18
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
502300, 502341, 502439, 4232135, B01J 2104, B01J 2302, B01J 3200
Patent
active
052121305
ABSTRACT:
A washcoated substrate and method for producing the washcoat on the substrate are disclosed which comprises forming a slurry comprising at least one ionizable compound of A, where A is selected from barium, strontium, and combinations thereof, and A is in an amount sufficient to yield AO in an amount of about 0.2-20% by weight of the washcoat, an aluminum oxide yielding species, and a medium wherein at least a portion of the ionizable compound ionizes to form ions of A, contacting the slurry with a substrate to form a green coating containing A and the aluminum oxide yielding species thereon, and heat treating the resulting green-coated substrate at a temperature and for a time sufficient to form a washcoat consisting essentially of AO-Al.sub.2 O.sub.3 on the substrate, wherein A is homogeneously distributed throughout the Al.sub.2 O.sub.3, the washcoat having a specific surface area, as measured by the N.sub.2 BET method, of at least about 50 m.sup.2 /g, which surface area remains after at least two repeated exposures of the washcoat to temperatures of greater than about 500.degree. C. Additionally, the slurry solid can be removed from the liquid, fired to form a material comprising AO-Al.sub.2 O.sub.3, and another slurry formed of the fired material and a medium. This slurry can then be contacted with a substrate to form the green coating which is then heat treated to form the washcoat.
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Addiego William P.
Lachman Irwin M.
Patil Mallanagouda D.
Williams Jimmie L.
Williams Melcenia R.
Corning Incorporated
Quatrini L. Rita
Shine W. J.
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