Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Electrochemical upgrading of bio-oil could be an appealing alternative to current upgrading technologies, as they operate at moderate reaction conditions and can employ renewable electricity. One way to lower the acid content in bio-oil and thereby improving the quality of the bio-oil is by Kolbe electrolysis. In Kolbe electrolysis, carboxylic acids are converted to alkanes, alcohols, esters and carbon dioxide. The reaction conditions strongly influence the product distribution [1]. Despite the emerging interest in Kolbe electrolysis, electrode design is barely explored[2]. Platinum is one of the most common electrode materials used for Kolbe electrolysis, because it is able to facilitate radical formation, whereas many other materials have failed to do so [3]. However, the high price of platinum offers challenges in the upscaling of the process. Therefore, it is relevant to investigate how platinum can be used in a cost-effective way to promote Kolbe electrolysis.
In this work, the performance of platinized titanium and nickel electrodes is discussed and compared with commonly employed platinum foil electrodes. The results showed that the performance of the electrodes is substrate specific and that full coverage of the substate with platinum is required to obtain high selectivity to the Kolbe products.
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