Developing a thermally stable Co/Ce-Sn catalyst via adding Sn for soot and CO oxidation

Area of Science:

• Catalysis
• Materials Science
• Environmental Science

Background:

• Catalyst thermal stability is crucial for high-temperature applications.
• Harsh conditions, including high temperatures, pose significant challenges to catalyst performance.
• Ceria-based catalysts are widely studied but often suffer from thermal degradation.

Purpose of the Study:

• To develop a strategy for improving the thermal stability of ceria-based catalysts.
• To investigate the role of tin (Sn) incorporation in enhancing catalyst stability.
• To evaluate the catalytic performance of the developed material under demanding conditions.

Main Methods:

• Synthesis of ceria-based catalysts with tin and cobalt.
• X-ray Diffraction (XRD) and Rietveld refinement for structural analysis.
• Characterization of catalytic activity for soot and carbon monoxide oxidation.
• Thermal aging studies at high temperatures (up to 1000°C).

Main Results:

• Formation of a Sn-Co solid solution was confirmed, crucial for thermal stability.
• The 3%Co/Ce_0.5Sn_0.5O₂ catalyst demonstrated excellent thermal stability and resistance to SO₂ and H₂O.
• The catalyst maintained high activity for soot oxidation in simulated diesel exhaust.
• Extraordinary thermal stability and high catalytic activity for CO oxidation were observed, even after 1000°C aging.

Conclusions:

• Tin incorporation effectively stabilizes ceria-based catalysts against thermal degradation.
• The Sn-Co solid solution is key to achieving high thermal stability and catalytic performance.
• The developed catalyst shows great promise for treating diesel exhaust and other high-temperature applications.