Upgrading of bio-oil into advanced biofuels and chemicals, Part III: Changes in aromatic structure and coke forming propensity during the catalytic hydrotreatment of a fast pyrolysis bio-oil with Pd/C catalyst
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This study has investigated the hydrotreatment of bio-oil (derived from the fast pyrolysis of mallee woody biomass) in a batch reactor under 10 MPa pressure with Pd/C catalyst at temperatures between 150 °C and 300 °C. Our results indicate that the chemical fractions, coking tendency as well as the aromatic structures are highly influenced by the hydrotreating conditions such as temperature and time. The repolymerisation surpasses the hydrogenation of bio-oil at the low hydrotreating temperatures (e.g. 150–200 °C) and short hydrotreating durations (e.g. <3 h). On the contrary, high hydrotreating temperatures (e.g. 250–300 °C) and long reaction durations (e.g. 6–12 h) can effectively convert the heavier fractions into lighter fractions, and thus further reduce the coking tendency of the hydrotreated products. However, these harsh operational conditions cannot decrease the number of large aromatic ring systems. Most importantly, it is found that the combination of esterification and hydrotreatment can produce more stable bio-oil with lower coking tendency and less large aromatic ring systems than the direct hydrotreatment of bio-oil.
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Kadarwati, S.; Hu, X.; Gunawan, R.; Westerhof, R.; Gholizadeh, M.; Hasan, M.; Li, Chun-Zhu (2016)This study aims to investigate the coke formation during the hydrotreatment of bio-oil at low temperature. The catalytic hydrotreatment of bio-oil produced from the pyrolysis of mallee wood was carried out using pre-sulphided ...
Gholizadeh, M.; Gunawan, Richard; Hu, Xue; Kadarwati, S.; Westerhof, R.; Chaiwat, W.; Hasan, M.; Li, Chun-Zhu (2016)© 2016 Elsevier B.V. This paper reports the effects of hydrogen and bio-oil inlet temperature on the coke formation and product distribution during the hydrotreatment of bio-oil. A bench scale continuous hydrotreatment ...
Effects of temperature on the hydrotreatment behaviour of pyrolysis bio-oil and coke formation in a continuous hydrotreatment reactorGholizadeh, M.; Gunawan, R.; Hu, X.; De Miguel Mercader, F.; Westerhof, R.; Chaitwat, W.; Hasan, M.; Mourant, D.; Li, Chun-Zhu (2016)In this study, we investigated the effects of temperature on the hydrotreatment behaviour of bio-oil from the pyrolysis of mallee wood with a special focus on coke formation. The experiments were carried out in a continuous ...