Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1977-12-02
1979-10-16
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252472, 4232135, B01J 2104, B01J 2342, B01J 2344, B01J 2346
Patent
active
041712897
ABSTRACT:
The disclosure herein relates to (a) a process for the preparation of catalysts which are highly active for oxidizing the carbon monoxide (CO) and hydrocarbon (HC) present in automobile exhaust gases, with minimum oxidation of the sulfur dioxide, by controlling the acidity of the support, or carrier, within certain critical ranges while a Group VIII noble metal component, or components, is composited with said support in forming the catalyst; (b) a process embodying the use of the so-formed catalysts in the treatment of automotive exhaust gases; and, (c) the catalyst compositions so-formed from supports the surface acidity of which is controlled. In the formation of the catalysts the total surface acidity of the support on which the metal, or metals, component is deposited is maintained between about 0.01 to about 0.10 micromoles pyridine/m.sup.2, and the surface area of the metal, or metals, component ranges up to about 50 m.sup.2 /g, preferably from about 1 m.sup.2 /g to about 35 m.sup.2 /g, and more preferably from about 1 m.sup.2 /g to about 20 m.sup.2 /g.
REFERENCES:
patent: 3425792 (1969-02-01), Stephens
patent: 3458276 (1969-07-01), Bloch
patent: 4005177 (1977-01-01), Weidenbach et al.
patent: 4111848 (1978-09-01), Torii et al.
Exxon Research & Engineering Co.
Proctor L. A.
Shine W. J.
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