Low-temperature NO oxidation using lattice oxygen in Fe-site substituted SrFeO3−δ
| Autor: | Hiroyuki Asakura, Kazuki Tamai, Saburo Hosokawa, Kazuo Kato, Tsunehiro Tanaka, Kentaro Teramura |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Inorganic chemistry Doping General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Crystal structure engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences Catalysis Phase (matter) engineering Lattice oxygen Brownmillerite Physical and Theoretical Chemistry 0210 nano-technology NOx |
| Zdroj: | Physical Chemistry Chemical Physics. 22:24181-24190 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/d0cp03726e |
| Popis: | Improvement of the low-temperature activity for NO oxidation catalysts is a crucial issue to improve the NOx storage performance in automotive catalysts. We have recently reported that the lattice oxygen species in SrFeO3−δ (SFO) are reactive in the oxidation of NO to NO2 at low temperatures. The oxidation of NO using lattice oxygen species is a powerful means to oxidize NO in such kinetically restricted temperature regions. This paper shows that Fe-site substitution of SFO with Mn or Co improves the properties of lattice oxygen such as the temperature and amount of oxygen release/storage, resulting in the enhancement of the activity for NO oxidation in a low-temperature range. In particular, NO oxidation on SrFe0.8Mn0.2O3−δ is found to proceed even at extremely low temperatures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|