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We developed a durable single-atom platinum catalyst on titania nanowires for efficient low-temperature oxidation of CO and hydrocarbons, using significantly less precious metal. This catalyst shows sustained performance under harsh conditions.

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Area of Science:

  • Materials Science
  • Catalysis
  • Environmental Science

Background:

  • Single-atom catalysts (SACs) offer high reactivity but struggle with durability and practicality.
  • Developing robust SACs for low-temperature applications is crucial for energy efficiency and pollution control.

Purpose of the Study:

  • To engineer a highly stable and active single-atom platinum (Pt) catalyst on a novel titania support.
  • To evaluate the catalyst's performance in oxidizing carbon monoxide (CO) and hydrocarbons under simulated diesel exhaust conditions.

Main Methods:

  • Fabrication of a mesoporous rutile titania nanowire forest on cordierite honeycomb supports.
  • Anchoring single Pt atoms onto Ti vacancy sites within the titania nanowires.
  • Testing catalytic activity and durability under hydrothermal aging and sulfation.

Main Results:

  • Achieved 90% conversion of CO and hydrocarbons at ~160 °C, significantly lower than conventional catalysts.
  • Demonstrated exceptional low-temperature activity and stability against hydrothermal and sulfation degradation.
  • Utilized 5 times less platinum-group metals compared to a commercial oxidation catalyst.

Conclusions:

  • The robustly anchored single Pt atoms on titania nanowires provide a highly active and durable low-temperature oxidation catalyst.
  • This approach offers a practical and cost-effective solution for treating diesel exhaust emissions.
  • The catalyst's stability is attributed to the strong interaction between isolated Pt ions and Ti vacancy sites.