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Hydrodeoxygenation (HDO) of Bio-oil Model Compounds with Synthesis Gas Using a Water–Gas Shift Catalyst with a Mo/Co/K Catalyst

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Handbook of Climate Change Mitigation and Adaptation

Abstract

Bio-oil is a renewable and carbon-neutral energy source. It is made by the fast pyrolysis of biomass at elevated temperatures followed by condensation of vapors and aerosols that are removed rapidly from the pyrolysis chamber. Raw bio-oil contains significant amounts of oxygenated compounds which reduce its fuel quality. Upgrading raw bio-oil using hydrodeoxygenation (HDO) is one solution to increase fuel quality. Guaiacol and furfural are important model oxygen-containing compounds present in raw bio-oil. HDO of guaiacol and furfural with a dual Cu-based water–gas shift and Mo/Co/K HDO catalyst system in a static catalyst basket was studied in the gas phase in a batch autoclave using H2/CO at 4.0 MPa (total partial pressure of CO + H2) and temperatures of 200 °C, 250 °C, and 300 °C. Syngas HDO using two syngas mixtures (H2/CO/N2 ratios of 47:47:6 (50/50 syngas) and 18:23:46 (bio-syngas)) was compared to hydrogen alone, which is traditionally used in bio-oil upgrading. Liquid and gas products were analyzed using GC/MS. Temperature and catalyst both exert significant effects on conversion and product selectivity. Guaiacol conversions of 79–86 % were observed in both 50/50 syngas and bio-syngas systems at 300 °C, with 24–29 % cyclohexane formed in 4 h. Furfural exhibited ~100 % conversion in 4 h at 300 °C with both syngas systems. Reaction products from upgrading with syngases had a higher total heat of combustion but lower energy density than the products from reactions with pure H2. For example, 0.04 mol (4.96 g) of guaiacol has a total heat of combustion of 143.4 kJ with an energy density of 28.9 kJ/g (3.59 MJ/mol). Reaction products from upgrading the same amount of guaiacol with H2 had a total energy content and energy density of 146.6 ± 0.4 kJ and 38.8 ± 0.2 kJ/g (3.66 MJ/mol), respectively, compared to 153.6 ± 0.4 kJ and 35.8 ± 0.1 kJ/g (3.84 MJ/mol) for the product upgraded with bio-syngas. This, and product selectivity, suggests incorporation of some C from CO in these syngas reactions.

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Acknowledgments

This material is based upon work performed through the Sustainable Energy Research Center at Mississippi State University and is supported by the US Department of Energy under award DE-FG3606GO86025 and US Department of Agriculture under award AB567370MSU.

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Correspondence to Todd E. Mlsna .

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Wijayapala, R., Karunanayake, A.G., Proctor, D., Yu, F., Pittman, C.U., Mlsna, T.E. (2015). Hydrodeoxygenation (HDO) of Bio-oil Model Compounds with Synthesis Gas Using a Water–Gas Shift Catalyst with a Mo/Co/K Catalyst. In: Chen, WY., Suzuki, T., Lackner, M. (eds) Handbook of Climate Change Mitigation and Adaptation. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6431-0_79-1

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  • DOI: https://doi.org/10.1007/978-1-4614-6431-0_79-1

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