About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Nanotechnology for Energy, Environment, Electronics, Healthcare and Industry
|
| Presentation Title |
Stabilizing High-Valent Mn Single Atoms on Defect-Rich CeO₂ Nanoislands to Enhance N₂ Selectivity and SO₂ Resistance in Ultra-Low-Temperature NH₃-SCR Process |
| Author(s) |
Feibin Wei, Taotao Hu |
| On-Site Speaker (Planned) |
Feibin Wei |
| Abstract Scope |
Mn-based catalysts exhibit excellent catalytic activity in low-temperature NH₃-SCR. However, due to the variable and difficult-to-control valence states and coordination environments of Mn, the generation of N₂O byproducts is often inevitable, leading to poor N₂ selectivity. Additionally, the strong adsorption capacity of Mn toward SO₂ and their inferior resistance to SO₂ poisoning further limit their practical applications. In this work, a defect-rich CeO₂ nanoisland structure was fabricated by loading CeO₂ on high-surface-area TiO₂ nanotubes. Mn single atoms were in-situ anchored at the defect sites via a redox-driven method. The high-valent Mn structure ensured strong oxidative capability, while the uniformity of the Mn coordination environment significantly suppressed N₂O byproduct formation. Furthermore, the defect-rich CeO₂ acted as a sacrificial agent for SO₂ adsorption and oxidation, effectively protecting the Mn active sites from SO₂ poisoning during the reaction. Our work provides a viable strategy for advancing the industrial application of Mn-based catalysts. |