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Title

Effect of milling mechanism on the CO2 capture performance of limestone in the Calcium Looping process

AuthorsBenítez-Guerrero, Mónica; Valverde, J. M.; Perejón, Antonio ; Sánchez-Jiménez, P.E. ; Pérez-Maqueda, Luis A.
KeywordsBall milling
Porosity
Crystallite size
CO2 capture
Calcium-Looping
Issue Date2018
PublisherElsevier
CitationChemical Engineering Journal 346: 549- 556 (2018)
AbstractThis work analyzes the relevant influence of milling on the CO capture performance of CaO derived from natural limestone. Diverse types of milling mechanisms produce contrasting effects on the microstructure of the CaO formed after calcination of the milled limestone samples, which affects crucially the kinetics of carbonation at conditions for CO capture. The capture capacity of CaO derived from limestone samples milled using either shear or impact based mills is impaired compared to as-received limestone. After calcination of the milled samples, the resulting CaO porosity is increased while crystallinity is enhanced, which hinders carbonation. Conversely, if the material is simultaneously subjected to intense impact and shear stresses, CaO porosity is promoted whereas CaO cristanillity is reduced, which enhances carbonation in both the reaction and solid-state diffusion controlled regimes.
URIhttp://hdl.handle.net/10261/171914
Identifiersdoi: 10.1016/j.cej.2018.03.146
issn: 1385-8947
Appears in Collections:(ICMS) Artículos
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