Light-Induced Redox Looping of a Rhodium/Ce WO Photocatalyst for Highly Active and Robust Dry Reforming of Methane.

Angew Chem Int Ed Engl

Beijng National Laboratory for Molecular Sciences, State Key laboratory for Structural Chemistry of Unstable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Published: May 2022

AI Article Synopsis

  • Dry reforming of methane (DRM) is a method that converts greenhouse gases like methane (CH₄) and carbon monoxide (CO) into syngas, and researchers developed a new photocatalyst (Rh/CeWO) to improve this process.* -
  • This photocatalyst is unique because it combines photothermal and photoelectric processes, achieving a light-to-chemical energy efficiency of 4.65% even at moderate light intensity, which is better than traditional methods.* -
  • The study found that a charge transfer mechanism helps lower the activation energy needed for the reaction, and high oxygen mobility in the catalyst aids in reducing carbon deposits, suggesting a more efficient approach for industrial DRM applications.*

Article Abstract

Dry reforming of methane (DRM) has provided an effective avenue to convert two greenhouse gases, CH and CO , into syngas. Here, we design a DRM photocatalyst Rh/Ce WO that invokes both photothermal and photoelectric processes, which overcomes the thermodynamic limitation of DRM under conventional conditions. In contrast to plasmonic or UV-response photocatalysts, our photocatalyst produces a superior light-to-chemical energy efficiency (LTCEE) of 4.65 % with a moderate light intensity. We propose that a light-induced metal-to-metal charge transfer plays a crucial role in the DRM reaction, which induces a redox looping between Ce to W species to lower the activation energy. Quantum mechanical studies reveal that a high oxygen mobility of Ce WO , accompanied with the formation of oxo-bridge species, results in a substantial elimination of deposited C species during the reaction. Our catalyst design strategy could offer a promising energy-efficient industrial process for DRM.

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Source
http://dx.doi.org/10.1002/anie.202200567DOI Listing

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