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Continuous-Flow Plasma Synthesis of Single-Atom Au1/CeO2-Fe for Wide-Temperature-Window Water-Gas Shift Reaction.

Xinmiao Yu1, Changhua Wang1, Yuanyuan Li1

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A new single-atom catalyst enables efficient water-gas shift reactions at room temperature, significantly boosting hydrogen production. This breakthrough avoids energy-intensive temperature switching, offering a greener path for hydrogen generation and purification.

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continuous flowplasmasingle-atom catalystwater−gas shift reaction

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Area of Science:

  • Catalysis research
  • Materials science
  • Chemical engineering

Background:

  • Conventional water-gas shift (WGS) reactions require high temperatures (180-300 °C), necessitating energy-intensive processes.
  • Developing catalysts with a wide operating temperature range is crucial for energy efficiency and process simplification.
  • Low-temperature WGS is hindered by slow water splitting kinetics, limiting CO conversion rates.

Purpose of the Study:

  • To develop a novel catalyst for efficient WGS reactions across a wide temperature range, including room temperature.
  • To overcome the kinetic limitations of low-temperature WGS and enhance hydrogen production.
  • To design a catalyst that avoids the need for temperature switching in WGS processes.

Main Methods:

  • Fabrication of an oxygen vacancy-rich Au₁/CeO₂-Fe single-atom catalyst (SAC) using a continuous-flow solution plasma (CSP) strategy.
  • Uniform doping of Fe into the CeO₂ lattice to increase oxygen vacancy density and stabilize isolated Au atoms.
  • Photothermal excitation to activate the catalyst for WGS reactions from 25 °C to 300 °C.

Main Results:

  • The Au₁/CeO₂-Fe SAC exhibited high WGS activity across temperatures from 25 °C to 300 °C.
  • At 25 °C, CO conversion reached 35%, a significant improvement over conventional catalysts.
  • Fe doping enhanced H₂O dissociation, while Au SACs improved CO adsorption and oxidation.
  • Light activation of CeO₂ lattice oxygen facilitated a Mars-van Krevelen reaction cycle.

Conclusions:

  • The developed SAC effectively catalyzes WGS reactions from ambient to 300 °C without temperature switching.
  • This approach offers a promising pathway for energy-efficient hydrogen production and purification.
  • The catalyst design overcomes kinetic barriers for room-temperature WGS, demonstrating significant potential for industrial applications.