Artículo
CO2 capture performance of Ca-Mg acetates at realistic Calcium Looping conditions
Autor/es | Miranda Pizarro, Juan
Perejón Pazo, Antonio Valverde Millán, José Manuel Pérez Maqueda, Luis Allan Sánchez Jiménez, Pedro Enrique |
Departamento | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2017 |
Fecha de depósito | 2018-02-01 |
Publicado en |
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Resumen | The Calcium Looping (CaL) process, based on the cyclic carbonation/calcination of CaO, has emerged in the last years as a potentially low cost technique for CO2capture at reduced energy penalty. In the present work, natural ... The Calcium Looping (CaL) process, based on the cyclic carbonation/calcination of CaO, has emerged in the last years as a potentially low cost technique for CO2capture at reduced energy penalty. In the present work, natural limestone and dolomite have been pretreated with diluted acetic acid to obtain Ca and Ca-Mg mixed acetates, whose CO2capture performance has been tested at CaL conditions that necessarily imply sorbent regeneration under high CO2partial pressure. The CaL multicycle capture performance of these sorbents has been compared with that of CaO directly derived from limestone and dolomite calcination. Results show that acetic acid pretreatment of limestone does not lead to an improvement of its capture capacity, although it allows for a higher calcination efficiency to regenerate CaO at reduced temperatures (∼900 °C) as compared to natural limestone (>∼930 °C). On the other hand, if a recarbonation stage is introduced before calcination to reactivate the sorbent, a significantly higher residual capture capacity is obtained for the Ca-Mg mixed acetate derived from dolomite as compared to either natural dolomite or limestone. The main reason for this behavior is the enhancement of carbonation in the solid-state diffusion controlled phase. It is argued that the presence of inert MgO grains in the mixed acetate with reduced segregation notably promotes solid state diffusion of ions across the porous structure created after recarbonation. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Identificador del proyecto | CTQ2014-52763-C2-2-R
CTQ2014-52763-C2-1-R FQM-5735 TEP-7858 |
Cita | Miranda Pizarro, J., Perejón Pazo, A., Valverde Millán, J.M., Pérez Maqueda, L.A. y Sánchez Jiménez, P.E. (2017). CO2capture performance of Ca-Mg acetates at realistic Calcium Looping conditions. Fuel, 196, 497-507. |
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