Microtubular Fe/Mn-promoted CaO-Ca12Al14O33 bi-functional material for H2 production from sorption enhanced water gas shift.

Herein, a hollow microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 bi-functional material was prepared by the bio-template method and used for H 2 production from sorption enhanced water gas shift (SEWGS). The microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 exhibits excellent CO 2 capture and H 2 production performance in SEWGS/regeneration cycles. The stable hollow microtubular structure improves available adsorption and catalytic sites in Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 for CO 2 capture and H 2 production. Mn addition improves CO 2 affinity capacity of the microtubular material. The Fe-Mn interaction increases redox ability of Fe3+/Fe3+, 2+, which promotes CO conversion. Moreover, the formed Ca 2 Fe 2 O 5 and Ca 2 MnO 4 both increase oxygen vacancies to promote catalytic activity of the microtubular material for WGS and its CO 2 capture capacity. The CO conversions for the microtubular material with the Fe/Mn/Al/Ca molar ratio= 10/2/10/100 are 98.7% and 94.0% after 20 cycles under the mild and severe calcination conditions, respectively. The hollow microtubular bi-functional material shows good prospect for efficient H 2 production from SEWGS. [Display omitted] • Microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 bi-functional material was prepared. • Microtubular material is good for H 2 production by sorption enhanced water gas shift. • Porous and hollow microtubular structure of the material keeps stable in cycles. • Synergistic effect of Fe/Mn in the material promotes CO 2 capture and H 2 production. • High and stable H 2 production from SEWGS using microtubular material is achieved. [ABSTRACT FROM AUTHOR]