Ti doping-induced strain engineering boosts low-temperature NH<sub>3</sub>-SCR deNO<sub>x</sub> performance and H<sub>2</sub>O/SO<sub>2</sub> resistance of Ce<sub>8</sub>MnO<sub>x</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 42716920.
- Also identified by DOI 10.1038/s41467-026-76719-6.
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Abstract
H<sub>2</sub>O and SO<sub>2</sub> poisoning of cerium-manganese oxide catalysts remains a critical challenge for low-temperature selective catalytic reduction of nitrogen oxides by NH<sub>3</sub>. Here we show that Ti doping of CeO<sub>2</sub> induces lattice contraction and structural distortion, promoting the generation of oxygen vacancies, active oxygen species, and stable Ce-O-Ti interfaces. These strain-engineered structural modifications enhances surface Lewis acidity and triggers a downshift of the d-band center, collectively improving low-temperature catalytic activity and resistance to H<sub>2</sub>O/SO<sub>2</sub> poisoning. The optimized Ce<sub>8</sub>MnTi<sub>2.5</sub>O<sub>x</sub> catalyst achieves over 90% nitrogen oxides removal across a 150-335 °C temperature range. Under 5 vol.% water and 100 ppm SO<sub>2</sub>, it maintains over 98% efficiency for 12 h at 210 °C. Furthermore, during stepwise heating from 150 °C to 240 °C with 5 vol.% H<sub>2</sub>O and 200 ppm SO<sub>2</sub>, initial activity suppression below 180 °C is fully reversed at or above 210 °C, demonstrating temperature-driven regeneration. This study introduces a strain-engineering strategy for designing robust catalysts for low-temperature nitrogen oxides removal.