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Bimetallic TiO2 Nanoparticles for Lignin-Based Model Compounds Valorization by Integrating an Optocatalytic

Swaraj Rashmi Pradhan1, Marta Paszkiewicz-Gawron1, Dariusz Łomot1

  • 1Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.

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Summary

This study developed novel bimetallic catalysts (Cu-Au/TiO2 and Fe-Au/TiO2) for enhanced photocatalytic oxidation in microreactors. These catalysts show improved activity, particularly under visible light, offering a new approach for selective oxidation reactions.

Keywords:
aromatic alcoholbimetallic titanium dioxidefluoropolymerphotocatalytic selective oxidationultrasonic irradiationwall-coated microreactor

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Photocatalysis

Background:

  • Microreactors are increasingly used for photocatalytic reactions, especially selective oxidation.
  • Improving the activity of titanium dioxide (TiO2) through metal modification is crucial for targeted applications.

Purpose of the Study:

  • To synthesize and characterize novel bimetallic catalysts (Cu-Au/TiO2 and Fe-Au/TiO2) for photocatalysis.
  • To investigate the photocatalytic activity of these catalysts in microreactor environments for selective oxidation of aromatic alcohols.

Main Methods:

  • Ultrasound-assisted catalyst deposition on perfluoro-alkoxy alkane (PFA) microtube walls.
  • Sol-gel synthesis of Cu-Au/TiO2 and Fe-Au/TiO2 nanoparticles.
  • Characterization using techniques like UV-Vis DRS, HR-SEM, HR-TEM, XRD, FTIR, XPS, and N2 physisorption.
  • Photocatalytic activity evaluation under UV and visible light using batch and flow systems.

Main Results:

  • Bimetallic catalysts demonstrated enhanced photocatalytic selective oxidation compared to monometallic counterparts.
  • High conversion rates were observed for coniferyl alcohol (93%) and vanillin alcohol (52%) under specific conditions.
  • Ligand-to-metal charge transfer (LMCT) complex formation was identified as the primary mechanism for visible light activity.

Conclusions:

  • The developed Cu-Au/TiO2 and Fe-Au/TiO2 catalysts are effective for selective oxidation in microreactors.
  • The study provides insights into the mechanism of photocatalysis, particularly the role of LMCT under visible light.
  • This work contributes to the advancement of efficient photocatalytic processes in microreactor technology.