Ketones from acid condensation using supported CeO2 catalysts: Effect of additives

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Metal-doped, supported CeO /Al O catalysts are effective for the high temperature decarboxylative condensation of carboxylic acids to produce ketones. Representative catalysts were characterized based on H chemisorption, thermogravimetric reduction and coke analysis, and X-ray absorption spectroscopies at the Ce L -, K and Co K-, and Pd L -edges. Supported (on Al O ) CeO (∼15-20 wt.%) catalysts selectively catalyze the condensation of isobutyric acid to diisopropyl ketone and that of acetic acid and decanoic acid to methylnonylketone. Catalysts are stable in long-term operation, with periodic regeneration. The optimal temperature range is 470-480 °C for the former reaction and 400-420 °C for the latter. For the former reaction, doping supported CeO catalysts with most transition metals, or with strongly basic or acidic additives, catalyzed a variety of side reactions, but the addition of small amounts of Co that dissolved in CeO could increase the yield to desired ketone. For the latter reaction, certain group VIII metals added to CeO catalysts in higher concentrations proved beneficial, particularly Co or Pd. © 2007 Elsevier B.V. All rights reserved. 2 2 3 2 III III 2 3 2 2 x 2

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Applied Catalysis A: General

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