11-07-2013 дата публикации
Номер: US20130178670A1
The present invention relates to catalysts, to processes for making catalysts and to chemical processes employing such catalysts. The catalysts are preferably used for converting acetic acid and ethyl acetate to ethanol. The catalyst comprises an extruded modified support, and a precious metal. The processes for making the catalysts comprises modifying the catalyst, extruding the catalyst, and impregnating the precious metal onto the catalyst. 1. A process for forming a catalyst for hydrogenating acetic acid and/or an ester thereof to form ethanol , the process comprising the steps of:(a) mixing a support with at least one support modifier precursor having a metal selected from the group consisting of tungsten, molybdenum, vanadium, niobium, cobalt, tin, tantalum, and mixtures thereof to form a modified support;(b) extruding the modified support to form a pellet; and(c) impregnating the pellet with a precious metal.2. The process of claim 1 , wherein the support is selected from the group consisting of silica claim 1 , alumina claim 1 , titania claim 1 , silica/alumina claim 1 , pyrogenic silica claim 1 , high purity silica claim 1 , zirconia claim 1 , carbon claim 1 , zeolites and mixtures thereof.3. The process of claim 1 , wherein the metal is selected from the group consisting of tungsten claim 1 , cobalt claim 1 , tin claim 1 , and mixtures or oxides thereof.4. The process of claim 1 , wherein the metal comprises tungsten and cobalt.5. The process of claim 1 , wherein the precious metal is selected from the group consisting of rhodium claim 1 , rhenium claim 1 , ruthenium claim 1 , platinum claim 1 , palladium claim 1 , osmium claim 1 , iridium claim 1 , gold and mixtures thereof.6. The process of claim 1 , further comprising impregnating the pellet with at least one active metal that is selected from the group consisting of copper claim 1 , iron claim 1 , vanadium claim 1 , tin claim 1 , cobalt claim 1 , nickel claim 1 , titanium claim 1 , zinc claim 1 , ...
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