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Efficient CO2 conversion to CO using chemical looping over Co-In oxide.

Jun-Ichiro Makiura1, Sota Kakihara1, Takuma Higo1

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A new cobalt-indium oxide (Co-In2O3) material enables efficient chemical looping for carbon dioxide (CO2) conversion to carbon monoxide (CO) at lower temperatures. This advanced oxygen storage material demonstrates high CO2 splitting rates and durability for CO production.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Catalysis

Background:

  • Reverse water-gas shift (RWGS) using chemical looping (RWGS-CL) offers lower-temperature CO2 conversion to CO compared to conventional catalytic RWGS.
  • Efficient oxygen storage materials (OSMs) are crucial for optimizing RWGS-CL processes.

Purpose of the Study:

  • To develop and evaluate Co-In2O3 as a novel OSM for efficient RWGS-CL.
  • To assess the CO2 splitting performance and durability of Co-In2O3 in the mid-temperature range.

Main Methods:

  • Synthesis and characterization of Co-In2O3 as an OSM.
  • Evaluation of CO2 splitting rates and conversion efficiency in the 723-823 K range.
  • Assessment of material durability through redox cycling.

Main Results:

  • Co-In2O3 exhibited a high CO2 splitting rate within the 723-823 K range.
  • The material demonstrated excellent durability over multiple redox cycles.
  • Achieved a maximum CO2 conversion of approximately 80% in the CO2 splitting step, exceeding catalytic RWGS equilibrium limits.

Conclusions:

  • Co-In2O3 is a highly effective OSM for the RWGS-CL process.
  • The developed material enables efficient CO production from CO2 at lower temperatures with high conversion rates.