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Performance and operating limits of a sorbent-catalyst system for sorption-enhanced reforming (SER) in a fluidized bed reactor

AuthorsMartínez Berges, Isabel; Grasa Adiego, Gemma ; Meyer, Julien; Felice, Luca di; Kazi, Saima; Sanz, Cristina; Maury, Delphine; Voisin, Christophe
KeywordsSorption enhanced reforming
Hydrogen production
CO2 sorbent
Functional combined materials
Fluidized bed reactor
Issue Date15-Apr-2019
CitationChemical Engineering Science 205: 94-105 (2019)
AbstractThe combined performance of a synthetic CaO-Ca12Al14O33 sorbent and an Ni-MgAl2O4 reforming catalyst was tested in a fluidized bed reactor under relevant operating conditions for the sorption-enhanced reforming (SER) process. The effect of CH4 space velocity (i.e. kgCH4/h·kgcat), steam-to-carbon (S/C) ratio and superficial gas velocity on product gas composition was assessed, as well as the effect of regeneration conditions on material performance. Moreover, a bi-functional material prepared by mechanical mixing of the separate materials was also tested in the reactor under consecutive SER/regeneration cycles. H2 contents as high as 96 vol% (N2 free, dry basis) were achieved under SER operation, using the separate materials working with an Ni content of 3.75 wt% in the solid bed at 650 °C with S/C ratios of 3 and 4. This solid system is able to process up to 0.63 kgCH4/h·kgcat at 0.1 m/s superficial gas velocity and with an S/C ratio of 4, although the CH4 input has to be reduced to 0.33 kgCH4/h·kgcat when working with a lower S/C ratio. Similar H2 contents to those found with the separate materials were obtained with the combined sorbent-catalyst material working with 0.33 kgCH4/h·kgcat at 0.1 m/s superficial gas velocity and S/C ratios of 3 and 4. The CO2 sorption capacity of the combined material produced the same as that of the separate sorbent particles (i.e. around 0.25 gCO2/g calcined sorbent), while remaining stable throughout the SER/regeneration cycles.
Description10 Figuras.- 6 Tablas
Publisher version (URL)http://dx.doi.org/10.1016/j.ces.2019.04.029
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