Production of an ozone removal filter
AssigneeMcDonnell Douglas Corporation
InventorNorman R. Byrd
Life of this patent
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Abstract
Production of a device or filter for removal of ozone from air, e.g. in aircraft cabins, by depositing an oxide film containing manganese dioxide on a substrate, particularly a light weight thermally stable substrate, e.g. polybenzimidazole, by treatment with a permanganate solution containing a soluble ceric salt such as ceric ammonium nitrate, and preferably also a dichromate such as sodium dichromate, to form a dense strongly adherent film or coating of MnO.sub.2, ceric oxide and preferably also chromic oxide, on the substrate. A solution containing an oxidizable organic component such as abietic acid can be first applied to the substrate, followed by treatment with the above permanganate solution.
Claims31
A process for producing a coating including manganese dioxide on a substrate, and effective for removal of ozone from air, which comprises contacting said substrate comprising an oxidizable material with a permanganate solution containing a soluble ceric salt, reducing the permanganate on said substrate to manganese dioxide by the action of said permanganate on said oxidizable material, and forming a coating of manganese dioxide and ceric oxide.
A process for producing a coating including manganese dioxide on a substrate, and effective for removal of ozone from air, which comprises treating said substrate with a solution of an oxidizable organic component, contacting said substrate containing said oxidizable component with a permanganate solution containing a soluble ceric salt, reducing the permanganate on said substrate to manganese dioxide by the action of said permanganate on said organic component, and forming a coating of manganese dioxide and ceric oxide.
A process for producing a coating including manganese dioxide on a substrate, and effective for removal of ozone from air, which comprises treating said substrate with a solution of an oxidizable organic component, contacting said substrate containing said oxidizable component with a permanganate solution containing a soluble ceric salt and a dichromate, reducing the permanganate on said substrate to manganese dioxide by the action of said permanganate on said organic component, and forming a coating of manganese dioxide, ceric oxide, and chromic oxide, said permanganate being present in an amount ranging from about 20 to about 80 grams, said ceric salt being present in an amount ranging from about 5 to about 300 grams, and said dichromate being present in an amount ranging from about 2 to about 200 grams, per liter of solution.
A process for producing a filter effective particularly for removing ozone from air, which comprises contacting a porous light weight thermally stable material comprising an oxidizable substance, with a permanganate solution containing ceric ammonium nitrate, reducing said permanganate on said material by the action of said permanganate on said substance, and forming an MnO.sub.2, ceric oxide coating on said material.
Dependencies are inferred from the claim text.