Appeal No. 1996-2077
Application 08/271,922
10. A method of destroying atmospheric pollutants by oxidation comprising
passing air containing pollutants through a monolithic catalytic converter
comprising
(a) a unitary aluminum or aluminum alloy support within a housing
providing tortuous flow paths for gases passing over said support and
having an integral anodized surface layer at least 2 µm thick, said
support comprising one or more plate fin elements having a plurality
of fins arranged in an axial succession of offset fin rows, said
anodized surface layer being formed by anodizing at a temperature of
about 30°-37°C, followed by washing and optionally calcining at a
temperature of about 150° to 540° C;
(b) one or more Group VIII noble metals and optionally base metals
from Groups Ib, IIb, IIIa, IVa, Va, VIa, VIIa and VIII disposed on and
within said anodized surface layer of (a).
15. A monolithic catalytic converter comprising
(a) a unitary aluminum or aluminum alloy support within a housing providing
tortuous flow paths for gases passing over said support and having an
integral anodized surface layer at least 2 µm thick, said support comprising
one or more plate fin elements having a plurality of fins arranged in an axial
succession of offset fin rows, said anodized surface layer being formed by
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passing a direct current of about 9 amps/ft and about 8 to 15 volts through
said aluminum or aluminum alloy support as an anode in an electrolytic bath
comprising 5-20 wt. % aqueous sulfuric acid at a constant temperature of
about 30° to 37°C, and thereafter washing said anodized surface layer with
water and optionally calcining at a temperature in the range of 150° to
540°C;
(b) one or more Group VIII noble metals and optionally base metals
from Groups VIII, IIIa, and VIIa disposed on and within said anodized
and calcined surface layer of (a).
The references relied upon by the examiner are:
Carr et al. (Carr) 4,405,507 Sep. 20, 1983
Moskovits 4,472,533 Sep. 18, 1984
Cornelison et al. (Cornelison) 4,672,809 Jun. 16, 1987
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