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Lactose oxidation over palladium catalysts supported on active carbons and on carbon nanofibres

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Abstract

Liquid-phase lactose oxidation was investigated over supported Pd/C and Pd-carbon nanofibre catalysts, which were characterized by several methods. A complex relationship between catalyst activity and catalyst acidity was established, i.e. optimum catalyst acidity resulted in the highest activity in lactose oxidation. In-situ catalyst potential measurements during lactose oxidation gave information about the extent of accumulation of oxygen on the metal surface. These results could be correlated with catalyst deactivation, which was extensive over the most acidic catalysts at low reaction temperatures. Selectivity for the desired product, lactobionic acid, was a maximum of approximately 83% at 93% conversion. The main side-product was lactulose formed via isomerisation of lactose. Lower selectivity toward lactobionic acid was obtained when the rate of oxidation of lactose was low.

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Acknowledgements

Financial support provided by the Academy of Finland within the Centre of Excellence Programme (2000–2011) and by the Graduate School in Chemical Engineering is gratefully acknowledged.

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Authors and Affiliations

  1. Process Chemistry Centre, Åbo Akademi University, 20500, Turku, Finland

    Anton V. Tokarev, Elena V. Murzina, Kari Eränen, Heidi Markus, Päivi Mäki-Arvela & Dmitry Yu. Murzin

  2. Department of Inorganic Chemistry and Catalysis, Utrecht University, P. O. Box 80083, Utrecht, 3508, The Netherlands

    Arie J. Plomp & Johannes H. Bitter

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  1. Anton V. Tokarev
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  2. Elena V. Murzina
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  3. Kari Eränen
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  4. Heidi Markus
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  5. Arie J. Plomp
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  6. Johannes H. Bitter
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  7. Päivi Mäki-Arvela
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  8. Dmitry Yu. Murzin
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Correspondence to Dmitry Yu. Murzin.

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Tokarev, A.V., Murzina, E.V., Eränen, K. et al. Lactose oxidation over palladium catalysts supported on active carbons and on carbon nanofibres. Res Chem Intermed 35, 155–174 (2009). https://doi.org/10.1007/s11164-008-0023-3

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  • DOI: https://doi.org/10.1007/s11164-008-0023-3

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