Abstract
The selective oxidation of vanillin to vanillic acid was achieved using gold nanoparticles supported on alumina and titania. Selectivities up to 99 % at conversions over 90 % were obtained with pressurized oxygen as green oxidant in alkaline aqueous media. Our studies showed that the addition of at least 2 equivalents of strong Brönsted base had a crucial role in suppressing vanillin degradation and achieving high selectivity and conversion. The highest activities involved turn-over frequency values up to 1300 h−1 and were achieved using alumina supported catalysts.
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Acknowledgments
This work was funded by University of Helsinki Doctoral Programme in Chemistry and Molecular Sciences (CHEMS). The authors would like to thank Electron Microscopy Unit of the Institute of Biotechnology in University of Helsinki for providing laboratory facilities.
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Rautiainen, S., Chen, J., Vehkamäki, M. et al. Oxidation of Vanillin with Supported Gold Nanoparticles. Top Catal 59, 1138–1142 (2016). https://doi.org/10.1007/s11244-016-0633-8
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DOI: https://doi.org/10.1007/s11244-016-0633-8