Thermodynamic analysis of steam reforming of ethanol for hydrogen generation |
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Authors: | Wenju Wang Y. Q. Wang |
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Affiliation: | Key Laboratory of Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China |
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Abstract: | Thermodynamic equilibrium of ethanol steam reforming has been studied by Gibbs free energy minimization method for hydrogen production in the ranges of water‐to‐ethanol ratio from 0 to 20, reaction temperature from 400 to 2000 K, pressure from 1 to 60 atm, argon‐to‐ethanol ratio from 0 to 100. The optimal conditions suitable for the use in molten carbonate fuel cell and solid oxide fuel cell were obtained as follows: 900–1200 K, water‐to‐ethanol ratio of 3:6, and 1 atm. Under the optimal conditions, complete conversion of ethanol, 60.52–83.58% yield of hydrogen and 32.82–79.60% yield of carbon monoxide could be obtained and no coke forms. Higher pressures have a negative effect, but inert gases have a positive effect, on the hydrogen yield. Coke tends to form at lower temperatures and lower water‐to‐ethanol ratios. Copyright © 2008 John Wiley & Sons, Ltd. |
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Keywords: | ethanol steam reforming hydrogen thermodynamic equilibrium Gibbs free energy minimization coke‐free region inert component |
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