Process for Preparing Catalysts and Catalysts Made Thereby
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United States of America Patent
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app pub date -
Jan 7, 2014
filing date -
May 18, 2012
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Abstract
A process for preparing a catalyst comprising (A) selecting a catalyst support selected from the group consisting of gels of silica, silica alumina, alumina, aluminum phosphate, aluminaphospate, and combinations of two or more thereof; (B) mixing the catalyst support with one or more chromium containing compound, wherein the chromium containing compound is selected from the group consisting of chromium containing compounds which are oxidizable to a Cr+6 state and chromium containing compounds wherein the chromium is in a Cr+6 state; (C) mixing the catalyst support with one or more transition metal catalyst component; (D) calcining the catalyst support; and (E) optionally for the chromium containing compound which is oxidizable to a Cr+6 state, converting the chromium in the chromium containing compound to Cr+6; and (F) spray drying the catalyst support to form catalyst particles; wherein steps (B)-(F) may occur separately in any order or wherein any one or more of steps (B)-(F) may be combined together; and wherein the catalyst support gels are characterized by a surface area greater than 50 m2/gram and a pore volume greater than 0.5 cc/gram at the time of mixing the catalyst support gels with the chromium containing compound is provided.
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