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Experimental investigation of the Ca-Cu process for H2 production: Evaluation of reduction/calcination strategies

AuthorsDíez-Martín, Laura; López Sebastián, José Manuel ; Martínez Berges, Isabel; Grasa Adiego, Gemma ; Murillo Villuendas, Ramón ; Fernández García, José Ramón
KeywordsPressurized H2 production
CO2 capture
Ca/Cu looping process
Fixed bed reactor
Issue Date4-Feb-2019
CitationInternational Journal of Greenhouse Gas Control 83: 43-50 (2019)
AbstractThe exothermic reduction of the CuO present in a bed of solids (39% wt. CuO, 24.5% wt. CaCO3 and 1.5% wt. Ni, being the rest inert species for the process) with a fuel gas, generated a pure CO2 stream once steam was condensed (and free of N2). In this way, a Cu/Ca molar ratio of approximately 2 in the bed of solids allowed for CaCO3 calcination efficiencies of around 95% molar basis at the reducing gases break-through. This allowed performing consecutive cycles of the main reaction steps involved in the Ca/Cu H2 production process. The mixture CaO-based sorbent, reforming catalyst and Cu-based material was able to produce a gas stream with a 94.0% vol. H2 at 10 bar during the CH4 sorption enhanced reforming stage. The Cu-based material was oxidized with a highly diluted air stream at 10 bar, reacting in a well defined reaction front. A pure CO2 gas stream was obtained at reactor exit during the calcination/reduction stage with a fuel gas typical composition of a Steam Methane Reforming (SMR) stage with low steam to carbon molar ratio (S/C). The experimental results indicated that it was possible to cool the bed and to produce a syngas with a H2/CO molar ratio of about 3.5 suitable for its use in the calcination/reduction stage, in a SMR stage with low (S/C). It was also possible to perform the calcination/reduction and SMR in one single stage.
Description5 Figures, 1 Table.-- 14th International Conference on Greenhouse Gas Control Technologies, GHGT-14, del 21 al 25 Octubre 2018, Melbourne, Australia
Publisher version (URL)http://dx.doi.org/10.1016/j.ijggc.2019.01.022
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