Supported catalyst, process for its preparation and its use for the preparation of hydroxydiphenyl
AssigneeBayer Aktiengesellschaft
InventorsOtto Immel, Oskar Weissel, Hans-Helmut Schwarz
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Abstract
A supported catalyst containing rhodium and compounds of chromium, manganese, alkali metals and, if appropriate, compounds of sulphur is prepared by first applying compounds of chromium and manganese to the catalyst support, subsequently heating the catalyst support thus charged to elevated temperatures and then impregnating it with a rhodium solution, drying it, treating it with an alkali metal solution and, if appropriate, applying sulphur compounds to the catalyst support thus treated. The supported catalyst thus prepared can be used for the dehydrogenation of compounds and/or compound mixtures consisting of completely and/or partly hydrogenated hydroxydiphenyl.
Claims17
A supported catalyst comprising rhodium, hydroxides or oxides of chromium and manganese and oxides, hydroxides and/or alcoholates, carbonates, bicarbonates and/or salts of lower carboxylic acids of alkali metals, disposed on a catalyst support, wherein the rhodium is contained in an amount of 0.1 to 5% by weight, the chromium and manganese together are contained in an amount of 0.05 to 8% by weight, and the alkali metal is contained in an amount of 0.05 to 15% by weight, based on the catalyst support weight, and wherein the weight ratio of chromium to magnesium is 5:1 to 1:5.
A process for the preparation of a supported catalyst comprising rhodium and compounds of chromium, manganese and alkali metals disposed on a catalyst support, the process comprising depositing chromium and manganese on the catalyst support, heating the support to an elevated temperature, impregnating the support with a rhodium-containing solution, drying and treating the resultant support with an alkali metal-containing solution.
Dependencies are inferred from the claim text.