1 / 9

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.

cianna
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 !

More Related