Thermodynamic evaluation of methanol steam reforming for hydrogen production |
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| Affiliation: | 1. Japan Science and Technology Agency (JST), Innovation Plaza Kyoto, 1-30 Goryo-Ohara Nishikyo-ku, Kyoto 615-8245, Japan;2. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;1. Hydrogen for Mobility Lab, Institute for Future Transport and Cities, Coventry University, Priory Street, Coventry CV1 5FB, UK;2. School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B152TT, UK;3. Catalysts and Reactions Group, School of Chemical Engineering, The University of Birmingham, Edgbaston B15 2TT, UK;1. Institute on Membrane Technology of the Italian National Research Council (CNR-ITM), Via P. Bucci c/o University of Calabria, Cubo 17/C, Rende 87036, CS, Italy;2. Chemistry and Chemical Technologies Dpt., University of Calabria, Cubo 15/D, Via P. Bucci, Rende 87036, CS, Italy;3. University Campus Biomedico of Rome, Via Alvaro del Portillo 21, Rome 00148, Italy;4. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing University of Technology, Xin-Mo-Fan Road 5, 210009 Nanjing, PR China;1. Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India;2. Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia;1. A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991, Leninsky Prospect 29, Russian Federation;2. N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991, Leninsky Prospect 31, Russian Federation;1. State Key Lab of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China;2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | ![]()
Thermodynamic equilibrium of methanol steam reforming (MeOH SR) was studied by Gibbs free minimization for hydrogen production as a function of steam-to-carbon ratio (S/C = 0–10), reforming temperature (25–1000 °C), pressure (0.5–3 atm), and product species. The chemical species considered were methanol, water, hydrogen, carbon dioxide, carbon monoxide, carbon (graphite), methane, ethane, propane, i-butane, n-butane, ethanol, propanol, i-butanol, n-butanol, and dimethyl ether (DME). Coke-formed and coke-free regions were also determined as a function of S/C ratio.Based upon a compound basis set MeOH, CO2, CO, H2 and H2O, complete conversion of MeOH was attained at S/C = 1 when the temperature was higher than 200 °C at atmospheric pressure. The concentration and yield of hydrogen could be achieved at almost 75% on a dry basis and 100%, respectively. From the reforming efficiency, the operating condition was optimized for the temperature range of 100–225 °C, S/C range of 1.5–3, and pressure at 1 atm. The calculation indicated that the reforming condition required from sufficient CO concentration (<10 ppm) for polymer electrolyte fuel cell application is too severe for the existing catalysts (Tr = 50 °C and S/C = 4–5). Only methane and coke thermodynamically coexist with H2O, H2, CO, and CO2, while C2H6, C3H8, i-C4H10, n-C4H10, CH3OH, C2H5OH, C3H7OH, i-C4H9OH, n-C4H9OH, and C2H6O were suppressed at essentially zero. The temperatures for coke-free region decreased with increase in S/C ratios. The impact of pressure was negligible upon the complete conversion of MeOH. |
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