Repurposing of CO 2 to valuable hydrocarbons is crucial for energy security and a balanced carbon cycle. Reverse water gas shift chemical looping (RWGS-CL) is capable of efficient CO 2 to CO conversion at a low temperature of ∼600 °C with unprecedented rates using the La 0.75 Sr 0.25 FeO 3 (LSF) perovskite-type oxide amalgamated with silica. The LSF/SiO 2 composite (25% LSF by mass) promotes a notable extent of oxygen vacancies in the active phase, a key parameter for CO 2 conversion. In each of eight RWGS-CL cycles, CO generation yields of LSF/SiO 2 surpass those of LSF alone by about 200%, producing 2.6 mmol of CO g LSF −1 at a peak rate of 0.8 mmol CO g LSF −1 min −1 . This significant improvement is concomitant with a decreased average LSF crystallite size retained at these low thermochemical reaction temperatures. Evidence of this enhancement points to perovskite particle size reduction by silica, lattice strain induced by the support, and curtailed quantities of secondary phases that limit accessibility to active surfaces. In this contribution, an appropriate stable platform for improving earth abundancy in perovskite-based redox materials is demonstrated for industrialscale low-temperature CO 2 thermochemical conversion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.