(Invited) Electrochemical Upgrading of Bio-Oil
Feasibility tests were performed using water soluble model compounds, guaiacol that has two oxygen containing functional groups, a phenolic (−OH) and methoxy (−OCH3) groups and syringol that has a phenolic and two methoxy groups. These compounds are produced by pyrolysis of lignin. The selected model compound is co-fed with steam without using external hydrogen in the feed. A button cell configuration was used as the test vehicle with a nickel-cermet cathode and a ferrite-cobaltite perovskite anode. The results show that the EDox process produces a variety of compounds that have lower or no oxygenated functional groups. The liquid products were analyzed using GC-MS. Analysis shows that, on weight basis, a reduction of 25% and 47% of oxygen content occurred for guaiacol and syringol feed. Gas phase hydrocarbon products such as methane, ethane, propane, and propene were also identified but not included in estimating oxygen removal.
A deoxygenation trial of aqueous phase from the pyrolysis of yellow pine oil received from PNNL was also performed. Based on the analysis of liquid products collected, over 24% of oxygen removal was accomplished.
Test system modifications are planned to allow complete mass balance of the process. Electrode materials and test conditions will be modified to evaluate the effect on oxygen removal and product selectivity.
Acknowledgment: This material is based upon work supported by the Department of Energy under Award Number DE-EE0006288.
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