Ultra-stable low-coordinated Pt_SA/CeZrO₂ ordered macroporous structure integrated industrial-scale monolithic...

Area of Science:

• Catalysis
• Materials Science
• Environmental Science

Background:

• Platinum (Pt) catalysts are crucial for thermal processes but prone to deactivation (sintering, oxidation, loss) at high temperatures.
• Developing stable and efficient Pt catalysts is essential for advanced catalytic converters.

Purpose of the Study:

• To develop a novel platinum single-atom catalyst (Pt_SA) on a Ce_0.8Zr_0.2O₂ support with an ordered macroporous (OM) structure.
• To enhance catalyst stability and activity for high-temperature applications like propane oxidation.

Main Methods:

• Synthesized Pt_SA/CeZrO₂ catalyst with isolated single Pt atoms on an ordered macroporous Ce_0.8Zr_0.2O₂ support.
• Investigated the electronic properties of Pt_SA and the structural benefits of the OM support.
• Tested catalyst performance and stability under simulated aging conditions (800°C, 50h, 10 vol.% H₂O).

Main Results:

• Zr-stabilized Pt_SA enhances C-H activation and preserves peroxide activity at high temperatures.
• The OM structure effectively prevents Pt loss, reducing Pt loading to 0.4 g_Pt/L.
• The Pt_SA/CeZrO₂ catalyst maintained 92% propane conversion at 450°C after severe aging.

Conclusions:

• The novel Pt_SA/CeZrO₂ catalyst exhibits superior stability and activity compared to commercial catalysts.
• This catalyst design offers a promising solution for robust catalytic converters operating under harsh conditions.
• Successful integration into a commercial cordierite monolith demonstrates scalability potential.