Method for reactivation of platinum group metal catalyst with aqueous alkaline and/or reducing solutions
AssigneeOsaka Gas Co., Ltd.
InventorsKiaki Yamauchi, Yukihiko Morimoto, Toshikatu Sasaki, Katsumi Nakai
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Abstract
A method for reactivation of a platinum group metal catalyst which comprises treating the platinum group metal catalyst lowered in catalytic activity as the result of having been used for the catalytic reaction of hydrocarbons optionally containing an oxygen atom with at least one agent selected from an inorganic alkaline substance and a reducing substance in an aqueous medium.
Claims11
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for partial combustion of hydrocarbons or alkanols with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5.degree. to 250.degree. C. until the catalytic activity of the catalyst is substantially recovered.
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for partial combustion of hydrocarbons or alkanols with an aqueous solution of a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5.degree. to 250.degree. C. until the catalytic activity of the catalyst is substantially recovered.
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for partial combustion of hydrocarbons or alkanols with an aqueous solution or a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5.degree. to 250.degree. C. for a period of 3 minutes to 80 hours and then treating the catalyst with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5.degree. to 240.degree. C. until the catalytic activity of the catalyst is substantially recovered.
Dependencies are inferred from the claim text.