Method for recovering noble metals from metallic carrier catalytic device
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United States of America Patent
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Issued Date -
Aug 9, 2007
app pub date -
Mar 15, 2004
filing date -
Mar 15, 2004
priority date (Note) -
Abandoned
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Abstract
This invention provides a method for efficiently separating and recovering a wash coat which supports noble metal-containing catalytic component from a metallic carrier of a spent metallic carrier catalytic device for such purposes as the purification of exhaust gas from internal combustion engine, without substantially crushing or dissolving said metallic carrier, which method comprises subjecting a metallic carrier catalytic device which is composed of a metallic carrier having a wash coat provided thereon and a noble metal-containing catalytic component which is supported on the wash coat to a treatment with an aqueous solution of mixed acid which contains sulfuric acid and nitric acid.
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