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AssigneeAir Products and Chemicals, Inc.
InventorsTimothy C. Golden, Wilbur C. Kratz, Frederick C. Wilhelm, Ronald Pierantozzi, Andrzej Rokicki
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The present invention is directed to a process for adsorptive separation of carbon monoxide or olefins from gas mixtures using adsorbents, which comprise cuprous compounds dispersed on amorphous oxide or carbon macroporous supports. The compositions are prepared by impregnating cupric compounds on, preferably pretreated, supports with the aid of an aqueous solution of an ammonium salt of a di- or polycarboxylic acid dispersant, such as ammonium citrate, followed by reduction of the cupric compound to the corresponding cuprous compound. The reduction can be performed either by the use of elevated temperature or by the use of a reducing gas preferably carbon monoxide at relatively low temperatures up to 150.degree. C. Methods of synthesis are also disclosed.
A composite, copper halide-containing adsorbent selective for carbon monoxide or olefins, comprising a high surface area support of amorphous oxide or carbon and a dispersed cuprous halide, prepared by impregnating the support with a cupric compound in an aqueous solvent and an ammonium salt of a di- or polycarboxylic acid dispersant, dispersing the compound on the support with the dispersant, removing the solvent and reducing the cupric compound to the cuprous halide in the presence of a reducing gas.
An adsorbent selective for carbon monoxide comprising a composite, copper halide-containing composition comprising a high surface area support of amorphous oxide or carbon and a dispersed cuprous halide, prepared by impregnating the support with a cupric compound in an aqueous solvent and an ammonium salt of a di- or polycarboxylic acid dispersant, dispersing the compound on the support with the dispersant, removing the solvent and reducing the cupric compound to a cuprous halide on the support by contact with a reducing gas containing carbon monoxide at a temperature up to approximately 120.degree. C.
An adsorbent selective for carbon monoxide preferentially over carbon dioxide, methane and nitrogen, comprising an active, composite, copper halide-containing composition comprising a high surface area support of macroporous alumina, pretreated by heating at an elevated temperature in an inert gas to make the support more susceptible to impregnation of a cupric compound, and a dispersed cuprous ion in which the composition is prepared by impregnating the alumina support with cupric chloride dissolved in water and an ammonium citrate dispersant, dispersing the cupric chloride on the support with the dispersant, removing the water and reducing the cupric chloride to a cuprous ion on the alumina support by contact with a reducing gas containing carbon monoxide at a temperature up to approximately 120.degree. C.
A method for synthesis of a composite, copper halide-containing adsorbent having a high surface area support of amorphous oxide or carbon and a dispersed cuprous halide, comprising contacting such support with an aqueous solvent containing a cupric compound and an ammonium salt of a di- or polycarboxylic acid dispersant to impregnate the support with the cupric compound, dispersing the compound on the support with the dispersant, removing the solvent from the support and reducing the cupric compound to a cuprous halide in the presence of a reducing gas.
Dependencies are inferred from the claim text.