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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1278| Na2ZrO3 Stability under Reforming/Regeneration Cycles during the Steam Reforming of Ethanol with CO2 Absorption | |
| MIGUEL ANGEL ESCOBEDO BRETADO VIRGINIA HIDALINA COLLINS MARTINEZ ALEJANDRO LOPEZ ORTIZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Absorption enhanced reforming | |
| In this work Na2ZrO3 and a Ni-Al2O3 catalyst were used to evaluate the hydrogen production by the steam reforming of ethanol in combination with CO2 absorption. The Na2ZrO3 was synthesized by the solid state method with a Na2CO3/ZrO2 = 1:1 molar ratio and calcined at 900 °C in air. A 25% W Ni-Al2O3 catalyst was synthesized by incipient impregnation and calcined at 900 °C in air. During reforming, operating conditions were: H2O/C2H5OH = 6:1 molar ratio, T = 600 °C, SV = 414 h-1, with a reactor loading of Ni-Al2O3/Na2ZrO3 = 0.2g/3.7g. Results of the X-ray absorbent confirmed the Na2ZrO3 crystalline phase. While, the catalyst shown NiO and Al2O3 phases with a surface area of 125 m2/g. TGA CO2 absorption tests by Na2ZrO3 reached 84.3% of the theoretical absorption value. Ethanol steam reforming without absorbent reached a maximum concentration of 69.1% H2 (dry basis). After reaction X-ray results shows Ni and Al2O3 phases, while maintaining its initial surface area. Regeneration of the absorbent was carried out by separating this from the catalyst followed by calcination in air at T = 900 ° C by 4 hours. For the following reaction cycle the regenerated absorbent was remixed with the catalyst and reloaded to the reactor for a new step of reforming completing a reforming-regeneration cycle (R-Reg). 10 R-Reg cycles were performed resulting an excellent thermal and chemical stability of the Na2ZrO3 absorbent. While, during the reforming step an average of 92% H2 (dry basis), together with 8% CO2, and CO free with an absorbent carbonation of 17.7% W. These observed values are close to the thermodynamic equilibrium and show excellent compatibility between the reforming and carbonation kinetics, and a great thermal stability of materials resulting in an attractive process for hydrogen production. | |
| 2014 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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