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-Ca12Al14O33 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-Ca12Al14O33 exhibits excellent CO2 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-Ca12Al14O33 for CO2 capture and H-2 production. Mn addition improves CO2 affinity capacity of the microtubular material. The Fe-Mn interaction increases redox ability of Fe3+/Fe-3+,Fe- 2+, which promotes CO conversion. Moreover, the formed Ca2Fe2O5 and Ca2MnO4 both increase oxygen vacancies to promote catalytic activity of the microtubular material for WGS and its CO2 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.

Automated summary

A hollow microtubular Fe/Mn-promoted CaO-Ca12Al14O33 bi-functional material was prepared and exhibited excellent CO2 capture and H-2 production performance in sorption enhanced water gas shift (SEWGS). The stable hollow microtubular structure improved the available adsorption and catalytic sites, while the addition of Mn enhanced CO2 affinity and Fe-Mn interaction increased redox ability. The formed compounds promoted the catalytic activity and CO2 capture capacity.