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

Paper ID Volume ID Publish Year Pages File Format Full-Text
44426 46025 2007 12 PDF Available
Title
Ketones from acid condensation using supported CeO2 catalysts: Effect of additives
Abstract

Metal-doped, supported CeO2/Al2O3 catalysts are effective for the high temperature decarboxylative condensation of carboxylic acids to produce ketones. Representative catalysts were characterized based on H2 chemisorption, thermogravimetric reduction and coke analysis, and X-ray absorption spectroscopies at the Ce LIII-, K and Co K-, and Pd LIII-edges.Supported (on Al2O3) CeO2 (∼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 CeO2 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 CeOx could increase the yield to desired ketone. For the latter reaction, certain group VIII metals added to CeO2 catalysts in higher concentrations proved beneficial, particularly Co or Pd.

Graphical abstractMetal-doped, supported CeO2/Al2O3 catalysts are effective for the high temperature decarboxylative condensation of carboxylic acids to produce ketones. Catalysts were characterized by H2 chemisorption, thermogravimetric reduction and coke analysis, and X-ray absorption spectroscopies. Product distributions in the reaction to MNK for such catalysts are shown (Y = molar yield to MNK). Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Acid condensation; Non-symmetric ketone; Cerium oxide catalyst
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Ketones from acid condensation using supported CeO2 catalysts: Effect of additives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 320, 22 March 2007, Pages 122–133
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us