Hydrogen peroxide synthesis
AssigneeAir Products and Chemicals, Inc.
InventorsAugustine I. Dalton, Jr., Ronald W. Skinner
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Abstract
This invention relates to improvements in palladium-carbon catalysts for the production of hydrogen peroxide from a mixture of hydrogen and oxygen in the presence of an aqueous liquid capable of inhibiting the decomposition of hydrogen peroxide. The improvement comprises pretreating the catalyst with an aldehyde or ketone, and, preferably, also pretreating the catalyst with a dilute solution of hydrochloric acid. Improved catalysts are obtained by reducing a soluble palladium compound deposited on a high surface area non-graphitic carbon base, in the form of a dried powder, with hydrogen at 27.degree.-200.degree. C.
Claims15
In a process for producing hydrogen peroxide by contacting a mixture of hydrogen and oxygen with a previously-reduced palladium catalyst supported on a carbon base in the presence of an aqueous liquid, containing an acid and a non-acidic oxygen-containing organic compound, capable of inhibiting the decomposition of the thus-produced hydrogen peroxide, the improvement comprising pretreating the catalyst with a ketone or aldehyde before contacting the thus-pretreated catalyst with hydrogen and oxygen in the aqueous medium.
In a process for producing hydrogen peroxide with a mixture of gases comprising hydrogen and oxygen with a palladium catalyst supported on a carbon base in the presence of an aqueous liquid, containing an acid and a non-acidic oxygen-containing organic compound, capable of inhibiting the decomposition of thus-produced hydrogen peroxide, the improvement wherein the carbon base is non-graphitic and has a surface area greater than 400 m.sup.2 /g and wherein the palladium catalyst is prepared by impregnating the carbon base with a soluble palladium compound, drying the thus-impregnated carbon base and reducing the palladium compound with which the carbon base is impregnated to palladium with hydrogen at 40.degree.-140.degree. C.
In a process for producing hydrogen peroxide by contacting a mixture of gases comprising hydrogen and oxygen with a previously-reduced palladium catalyst supported on a carbon base in the presence of an aqueous liquid, containing an acid and a non-acidic oxygen-containing organic compound, capable of inhibiting the decomposition of the thus-produced hydrogen peroxide, the improvement comprising pretreating the catalyst with a dilute solution of HCl before contacting the thus-pretreated catalyst with hydrogen and oxygen in the aqueous medium.
Dependencies are inferred from the claim text.