Biohydrogen production from Imperata cylindrica bio-oil using non-stoichiometric and thermodynamic model |
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Authors: | Olagoke Oladokun Arshad Ahmad Tuan Amran T. Abdullah Bemgba Bevan Nyakuma Mohd Fadhzir A. Kamaroddin Shadiah Husna Mohd Nor |
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Affiliation: | 1. Center of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia;2. Department of Chemical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia;3. Department of Chemical Engineering, University of Maiduguri, P.M.B 1069, Maiduguri, Borno State, Nigeria |
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Abstract: | This paper presents a non-stoichiometric and thermodynamic model for steam reforming of Imperata cylindrica bio-oil for biohydrogen production. Thermodynamic analyses of major bio-oil components such as formic acid, propanoic acid, oleic acid, hexadecanoic acid and octanol produced from fast pyrolysis of I. cylindrica was examined. Sensitivity analyses of the operating conditions; temperature (100–1000 °C), pressure (1–10 atm) and steam to fuel ratio (1–10) were determined. The results showed an increase in biohydrogen yield with increasing temperature although the effect of pressure was negligible. Furthermore, increase in steam to fuel ratio favoured biohydrogen production. Maximum yield of 60 ± 10% at 500–810 °C temperature range and steam to fuel ratio 5–9 was obtained for formic acid, propanoic acid and octanol. The heavier components hexadecanoic and oleic acid maximum hydrogen yield are 40% (740 °C and S/F = 9) and 43% (810 °C and S/F = 8) respectively. However, the effect of pressure on biohydrogen yield at the selected reforming temperatures was negligible. Overall, the results of the study demonstrate that the non-stoichiometry and thermodynamic model can successfully predict biohydrogen yield as well as the composition of gas mixtures from the gasification and steam reforming of bio-oil from biomass resources. This will serve as a useful guide for further experimental works and process development. |
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Keywords: | Biohydrogen Steam reforming Bio-oil Thermodynamic Pyrolysis |
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