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And a little bit of ceria... The Promoting Effect of Ceria on Silver Selective Oxidation Catalysis

And a little bit of ceria... The Promoting Effect of Ceria on Silver Selective Oxidation Catalysis. Matthias J. Beier. Supervisors: Jan-Dierk Grunwaldt Georgios Kontogeorgis Supported by: Haldor Topsøe A/S, DTU-KT, MP 2 T (and FTP project). The Impact of Selective Oxidation Catalysis.

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And a little bit of ceria... The Promoting Effect of Ceria on Silver Selective Oxidation Catalysis

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  1. And a little bit of ceria...The Promoting Effect of Ceria on Silver Selective Oxidation Catalysis Matthias J. Beier Supervisors: Jan-Dierk Grunwaldt Georgios Kontogeorgis Supported by: Haldor Topsøe A/S, DTU-KT, MP2T (and FTP project)

  2. The Impact of Selective Oxidation Catalysis • Selective Oxidation: Highly important for the production of key intermediates • Challenges • Overoxidation/ Selectivity • Activity • Inexpensive catalyst • Inexpensive oxidizing agent, i.e. oxygen

  3. The selective oxidation of alcohols to aldehydes in the liquid phase • Useful in the fine chemical synthesis of odorants, artificial flavors and drugs • Upgrading of biomass platform molecules • Most catalysts based on Au, Pd, Pt and Ru in the liquid phase

  4. Searching for active silver catalysts Screening of supported silver catalysts with a test reaction A physical mixture of Ag/SiO2 and nano CeO2 is active! M.J. Beier, T.W. Hansen, J.-D. Grunwaldt, J. Catal. 2009, 266, 320.

  5. Catalyst performance Conditions: 20 mL xylene, 0.10 g biphenyl, 2.00 mmol benzyl alcohol, 50 mg catalyst, (25 mg CeO2), 2 h reflux in O2 atmosphere.

  6. The collaborative effect of silver and ceria Silver activates the alcohol Ceria activates oxygen M.J. Beier, T.W. Hansen, J.-D. Grunwaldt, J. Catal. 2009, 266, 320.

  7. CeO2 as promoter for Ag, Au and Pd catalysts in the selective alcohol oxidation Without CeO2 With CeO2 Conditions: 20 mL xylene, 0.10 g biphenyl, 2.00 mmol benzyl alcohol, 50 mg catalyst, (25 mg CeO2), 2 h reflux in O2 atmosphere.  Ceria promotes catalyst activity and selectivity in all cases

  8. Summary and Outlook • Ag/SiO2 becomes an effective catalyst for alcohol oxidation by adding nanocrystalline CeO2 • CeO2 has a general promoting effect • Ag/CeO2-SiO2 is also capable of promoting the oxidation of more inert aryl aromatic compounds

  9. Thanks to… Jan-Dierk Grunwaldt Georgios Kontogeorgis Søren Mikkelsen KT technicians Haldor Topsøe A/S Thanks for the Attention !

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