Portal de Periódicos da CAPES

Microstructured ZrO2 coating of iron oxide for enhanced CO2 conversion

2021; Elsevier BV; Volume: 292; Linguagem: Inglês

10.1016/j.apcatb.2021.120194

1873-3883

Bo Jin, Hilde Poelman, Christophe Detavernier, Zhiwu Liang, Guy Marin, Vladimir Galvita,

Catalysis and Oxidation Reactions

This work provides a way to design oxygen carriers for chemical looping.Starting from Prussian blue microcubes, Zr-promoted Fe-based materials are developed for the conversion of CO 2 into CO.Thermally induced oxidative decomposition of ZrO 2 -coated Prussian blue under the protection of the firstly formed ZrO 2 shell leads to the formation of hollow structured materials.Detailed activity tests and in-situ characterization are used to investigate the relationship between material structure, stability and CO yield from CO 2 conversion.Throughout one hundred H 2 -CO 2 redox cycles, 10 % Fe 2 O 3 /ZrO 2 exhibits a 27 times higher CO space-time yield (86mmol•s -1 •kg -1 Fe2O3 ) than unpromoted, yet hollow structured Fe 2 O 3 .This superior performance derives from the dual role that ZrO 2 plays: protecting the structure, thereby improving the iron oxide sintering resistance, and facilitating the reduction of iron oxide during redox cycles.The hollow structure and the interaction between Fe 2 O 3 and ZrO 2 are the main reasons for the enhanced redox activity.