The main pillar in the advancement of chemical looping (CL) technology is the development of oxygen carriers that are reactive and mechanically resistant without neglecting their cost and environmental impact. In this work, the applicability of a waste with a high iron oxide content in different processes based on the chemical looping (CL) concept is analyzed. Experiments were performed in a TGA apparatus under conditions that would be present in different CL processes: chemical looping combustion (CLC), chemical looping reforming or gasification (CLR or CLG), and chemical looping water or CO2 splitting (CLWS or CO2SPLIT). The oxygen carrier performed well even under highly reduced conditions and maintained its reactivity. Independently of the redox transformation considered, it was observed that iron migration to the surface of FS_GR particles took place. The high rate index with methane found in the transformation Fe2O3/Fe3O4 made this material promising for CLC. FS_GR material also met the reactivity requirements set for the CO2SPLIT process. Thus, it will be further considered as a potential oxygen carrier for diverse CL applications.

This work was supported by CO2SPLIT project grant PID2020-113131RB-I00 funded by MICIN/AEI/10.13039/501100011033 and the Gobierno de Aragón – Dpto. de Ciencia, Universidad y Sociedad del Conocimiento - Project LMP166_21. B.Z. acknowledges the “Juan de la Cierva” Program (IJCI-2016-30776).

11 figures, 5 tables.-- Published as part of Energy & Fuels special issue “Celebrating Women in Energy Research”.

Peer reviewed