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Nanosilica supported CaO: A regenerable and mechanically hard CO2 sorbent at Ca-looping conditions

Opened Access Nanosilica supported CaO: A regenerable and mechanically hard CO2 sorbent at Ca-looping conditions

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Autor: Sánchez Jiménez, Pedro Enrique
Pérez Maqueda, Luis Allan
Valverde Millán, José Manuel
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2014
Publicado en: Applied Energy, 118, 92-99.
Tipo de documento: Artículo
Resumen: This work presents a CO2 sorbent that may be synthesized from low-cost and widely available materials following a simple method basically consisting of impregnation of a nanostructured silica support with a saturated solution of calcium nitrate. In a first impregnation stage, the use of a stoichiometric CaO/SiO2 ratio serves to produce a calcium silicate matrix after calcination. This calcium silicate matrix acts as a thermally stable and mechanically hard support for CaO deposited on it by further impregnation. The CaO-impregnated sorbent exhibits a stable CaO conversion at Ca-looping conditions whose value depends on the CaO wt% deposited on the calcium silicate matrix, which can be increased by successive reimpregnations. A 10wt% CaO impregnated sorbent reaches a stable conversion above 0.6 whereas the stable conversion of a 30wt% CaO impregnated sorbent is around 0.3, which is much larger than the residual conversion of CaO derived from natural limestone (between 0.07 and 0.08). M...
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Cita: Sánchez Jiménez, P.E., Pérez Maqueda, L.A. y Valverde Millán, J.M. (2014). Nanosilica supported CaO: A regenerable and mechanically hard CO2 sorbent at Ca-looping conditions. Applied Energy, 118, 92-99.
Tamaño: 17.63Mb
Formato: PDF

URI: https://hdl.handle.net/11441/74165

DOI: 10.1016/j.apenergy.2013.12.024

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