The Influence Of NO/O2 On The NOx Storage Properties Over A Pt-Ba-Ce/γ-Al2O3 Catalyst
| Autor: | Xuedong Feng, Jing Yi, Peng Luo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
nsr
Chemistry Inorganic chemistry mechanism 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis lcsh:Chemistry lcsh:QD1-999 Materials Chemistry nox storage capacity no-tpd 0210 nano-technology NOx diesel engine |
| Zdroj: | Open Chemistry, Vol 17, Iss 1, Pp 1459-1465 (2019) |
| ISSN: | 2391-5420 |
| Popis: | With the purpose of studying the influence of NO/O2 on the NOx storage activity, a Pt-Ba-Ce/γ-Al2O3 catalyst was synthesized by an acid-aided sol-gel method. The physical and chemical properties of the catalyst were characterized by X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) methods. The results showed that the composition of the catalyst was well-crystallized and the crystalline size of CeO2 (111) was about 5.7 nm. The mechanism of NO and NO2 storage and NOx temperature programmed desorption (NO-TPD) experiments were investigated to evaluate the NOx storage capacity of the catalyst. Pt-Ba-Ce/γ-Al2O3 catalyst presented the supreme NOx storage performance at 350℃, and the maximum value reached to 668.8 μmol / gcat. Compared with O2-free condition, NO oxidation to NO2 by O2 had a beneficial effect on the storage performance of NOx. NO-TPD test results showed that the NOx species stored on the catalyst surface still kept relatively stable even below 350℃. |
| Databáze: | OpenAIRE |
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