An experimental and theoretical approach for the biogas steam reforming reaction |
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Authors: | D.G. Avraam T.I. Halkides D.K. Liguras O.A. Bereketidou M.A. Goula |
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Affiliation: | 1. Prefecture Authority of Imathia, Section of Town-Planning and Environment, GR-59100 Veria, Greece;2. Technological Educational Institute of Western Macedonia, Pollution Control Technologies Department, GR-50100 Koila, Kozani, Greece;3. HELBIO S.A., Hydrogen and Energy Production Systems, Patras Science Park, Stadiou Street, Platani, GR-26504 Rio, Greece;4. University of Western Macedonia, Department of Mechanical Engineering, Bakola and Sialvera, GR-50100 Kozani, Greece |
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Abstract: | An experimental and theoretical study for the biogas steam reforming reaction over 5%Ru/Al2O3 catalyst have been performed. An apparatus was constructed for the conduction of the experiments, the core of which was a tube reactor, filled with the catalyst in form of pellets. The inlet gas mixture consisted of CH4 and CO2 in various composition ratios as a model biogas and steam. A theoretical model of the process was developed. The experimental reactor was modelled as an isothermal pseudo homogeneous fixed bed reactor. Internal and external transport phenomena were neglected and appropriate effectiveness factors were employed instead. A physical properties model was used for the calculation of the physicochemical properties of the real mixture. Five reactant species, CH4, CO2, H2O, CO and H2, were included in the model, whereas the feed consisted of the first three. Steam reforming and water gas shift were the main reactions. Experimental results and theoretical predictions match closely, stability of the catalyst was assured and an optimal operational window was identified, at GHSV = 10,000–20,000 h−1, T = 700–800 °C, CH4/CO2 = 1.0–1.5 and H2O/CH4 = 3.0–5.0. |
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Keywords: | Biogas Steam reforming Hydrogen production Heterogeneous catalysis Fixed bed reactor |
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