Catalytic conversion of bio-oil in supercritical water: Influence of RuO2/γ-Al2O3 catalysts on gasification efficiencies and bio-methane production


Catalytic supercritical water gasification of heavy (dewatered) bio-oil has been investigated in a batch reactor in the presence of ruthenium catalysts in the form of RuO2 on γ-Al2O3 support. The reactions were carried out at temperatures of 400 °C, 450 °C and 500 °C and reaction times of up to 60 min using 15 wt% of bio-oil feed. Increased ruthenium oxide loading led to increased carbon gasification efficiencies (CGE) and bio-methane production. Hence, using the 20 wt% RuO2/γ-Al2O3 catalyst, CGE was 97.4 wt% at 500 °C and methane yield reached nearly 30 wt% of the bio-oil feed, which gave a CH4/CO2 molar ratio of 1.28. There was evidence that the RuO2 was involved in the initial conversion of the bio-oil to carbon oxides and hydrogen as well as the reduction of the CO2 to methane via CO methanation. However, competition for CO consumption via the water-gas shift reaction was also possible due to the large presence of water as the reaction medium. This work therefore demonstrates that high concentrations of heavy fraction of bio-oil can be catalytically converted to a methane-rich gas product under hydrothermal conditions at moderate temperatures. The calorific values of the gas product reached up to 54 MJ kg−1, which is nearly 3 times the HHV of the bio-oil feed.

Publication DOI:
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Additional Information: © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Uncontrolled Keywords: Hydrothermal gasificationCatalysisRuthenium oxideBio-methane
Full Text Link: http://eprints. ... pt%20-Final.pdf
Related URLs: https://www.sci ... 0199?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2016-01-01
Published Online Date: 2015-07-17
Accepted Date: 2015-06-29
Authors: Onwudili, Jude ( 0000-0002-5355-9970)
Williams, Paul T

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