Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1990-12-11
1992-05-26
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502328, 4232135, B01J 2104, B01J 2310, B01J 2358
Patent
active
051168006
ABSTRACT:
This invention relates to a high durability catalyst for treating automotive exhaust gas which produces a minimal amount of hydrogen sulfide and is essentially free of cerium oxide and which comprises a support consisting substantially of delta alumina, an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide, and, effective amounts of the noble metals palladium and rhodium deposited on the support.
In an additional embodiment of the invention,m the support may contain delta alumina, and, optionally zirconia, and the catalyst may contain an overlayer containing delta or gamma alumina, and optionally, zirconia. Effective amounts of the noble metals palladium and rhodium may be deposited on the support and/or on the overlayer.
In another aspect, the invention resides in a process for treating the exhaust gases from automotive engines to remove carbon monoxide, hydrocarbons, and nitrogen oxides, and to minimize the production of hydrogen sulfide.
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Kirk-Othmer, Ency of Chem. Tech., Third Ed., vol. 2, pp. 225-233.
H. C. Yao et al., "Ceria in Automotive Exhaust Catalysts", J. Catal., 86, pp. 254-265 (1984).
K. Otto et al., "The Reduction of Nitric Oxide by Hydrogen over Pt/.gamma.-Al.sub.2 O.sub.3 as a Function of Metal Loading", J. Catal., 66, pp. 229-236 (1980).
Linden Douglas G.
Summers, II Jack C.
Williamson W. Burton
Allied-Signal Inc.
Boldingh Mary Jo
Criss Roger H.
Shine W. J.
Wells Harold N.
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