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- Title
Active Site of O<sub>2</sub> and Its Improvement Mechanism over Ce-Ti Catalyst for NH<sub>3</sub>-SCR Reaction.
- Authors
Dong Jiang; Shule Zhang; Yiqing Zeng; Pengfei Wang; Qin Zhong
- Abstract
The current study on Ce-Ti catalyst was mainly focused on the function of NH3 and NO adsorption sites. In our study, by comparing Ce-Ti (doped catalyst) to Ce/Ti (supported catalyst), the active site of O2 and its improvement mechanism over Ce-Ti catalyst for NH3-Selective catalytic reduction (SCR) reactions were investigated. For Ce-Ti catalyst, a cerium atom was confirmed entering a TiO2 crystal lattice by X-ray diffraction (XRD) and Raman; the structure of Ce-⇔-Ti (⇔ represents oxygen vacancy) in Ce-Ti catalyst was confirmed by X-ray photoelectron spectroscopy (XPS) and Photoluminescence spectra (PL spectra). The nature of this structure was characterized by electron paramagnetic resonance (EPR), Ammonia temperature-programmed desorption (NH3-TPD), hydrogen temperature-programmed reduction (H2-TPR), Nitric oxide temperature-programmed desorption (NO-TPD) and In situ DRIFT. The results indicated that oxygen vacancies had a promotive effect on the adsorption and activation of oxygen, and oxygen was converted to superoxide ionsin large quantities. Also, because of adsorption and activation of NO and NH3, electrons were transferred to adsorbed oxygen via oxygen vacancies, which also promoted the formation of superoxide ions. We expected that our study could promote understanding of the active site of O2 and its improvement mechanism for doped catalyst.
- Subjects
CATALYSTS; CATALYST selectivity; SUPEROXIDES
- Publication
Catalysts (2073-4344), 2018, Vol 8, Issue 8, p336
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal8080336