MRS Meetings and Events


DS01.05.03 2022 MRS Fall Meeting

Iron-Poor Ferrites for Low Temperature CO2 Conversion via Reverse Water-Gas Shift Thermochemical Looping

When and Where

Nov 29, 2022
8:00pm - 10:00pm

Hynes, Level 1, Hall A



Eddie Sun1,Jimmy Rojas1,Gang Wan1,Arun Majumdar1

Stanford University1


Eddie Sun1,Jimmy Rojas1,Gang Wan1,Arun Majumdar1

Stanford University1
CO<sub>2</sub> utilization via the reverse-water-gas-shift (RWGS) reaction for the production of CO and then to long chain hydrocarbons is a potentially scalable method to mitigate rising global CO<sub>2</sub> emissions, if appreciable CO yields can be achieved at low reaction temperatures. Here, we report that Fe<sub>0.35</sub>Ni<sub>0.65</sub>O<sub>x </sub>achieves, to the best of our knowledge, a record high experimentally measured CO yield of 80 mL-CO/g<sub>MOx</sub>/cycle at low reaction temperatures (500°C for both oxidation and reduction steps) in a chemical looping (CL) process. This reported yield is an order of magnitude higher than previously reported RWGS-CL metal oxides at 500°C. We identified the composition of the metal oxide Fe<sub>0.35</sub>Ni<sub>0.65</sub>O<sub>x</sub> using the Calculation of Phase Diagrams (CALPHAD) methodology to screen and filter through many combinations of metal oxides. We then experimentally tested this Fe<sub>0.35</sub>Ni<sub>0.65</sub>O<sub>x </sub>metal oxide for chemical looping RWGS and utilize x-ray characterization techniques and CALPHAD to find that a spinel-to-metallic phase transition gives Fe<sub>0.35</sub>Ni<sub>0.65</sub>O<sub>x</sub> its noteworthy CO yield and oxygen capacity. We emphasize the importance of thermodynamics calculations and CALPHAD screening to quickly search through the vast design space of metal oxides to greatly reduce the amount of necessary experimentation.

Symposium Organizers

Wenhao Sun, University of Michigan
Alexandra Khvan, National Research Technological University
Alexandra Navrotsky, Arizona State University
Richard Otis, NASA Jet Propulsion Laboratory

Publishing Alliance

MRS publishes with Springer Nature