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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1303| ABSORPTION ENHANCED REFORMING OF LIGHT ALCOHOLS (METHANOL AND ETHANOL) FOR THE PRODUCTION OF HYDROGEN: THERMODYNAMIC MODELING | |
| MIGUEL ANGEL ESCOBEDO BRETADO MANUEL DAVID DELGADO VIGIL VIRGINIA HIDALINA COLLINS MARTINEZ ALEJANDRO LOPEZ ORTIZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Absorption-Enhanced-Reforming Methanol | |
| Thermodynamic modeling of the steam reforming of light alcohols using CaO, CaO*MgO, Na2ZrO3, Li2ZrO3 and Li4SiO4 as CO2 absorbents was carried out to determine promising operating conditions to produce a high hydrogen production ratio (HR) and concentration (% H2) gas product. Light alcohols studied were ethanol and methanol at 300-850°C and 1 atm. Steam to alcohol (S/COH) molar feed ratio varied from 1:1 (stoichiometric) to 6:1 for methanol and from 3:1 (stoichiometric) to 6:1 for ethanol. Thermodynamic simulation employed the Gibbs free energy minimization technique to obtain equilibrium compositions. Results indicate no carbon formation at S/COH ≤ stoichiometric. Methanol reforming at 600°C and S/COH = 6, without CO2 absorbent (WOA), produced a hydrogen ratio (HR) of 2.76 (molsH2/molCH3OH fed) and 73.5% H2. At the same conditions CaO, CaO*MgO, and Na2ZrO3 produced a HR (% H2) of 2.98 (98.2% H2), 2.96 (96.4% H2) and 2.91 (98.2% H2), respectively. Ethanol reforming WOA generated a HR = 4.6 (69.5% H2) at 600°C and S/COH = 6, while CaO, CaO*MgO, and Na2ZrO3 showed a HR (% H2) of 5.7 (96.6% H2), 5.5 (94.1% H2) and 5.4 (92.3% H2), respectively. For both cases other absorbents produced lower values. In both reforming systems (methanol and ethanol) most favorable thermodynamics were obtained with CaO and CaO*MgO as absorbents; however stability of these absorbents CaO*MgO, and Na2ZrO3 must be improved. While, Na2ZrO3 is a promising alternate absorbent with comparable thermodynamics and greater kinetics and stability. Modeling results agreed with experimental evaluation of ethanol reforming using CaO*MgO, and Na2ZrO3. | |
| 2011 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Hydrogen2011_Sub69.pdf | 2.11 MB | Adobe PDF | Visualizar/Abrir |