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Active Site of O2 and Its Improvement Mechanism over Ce-Ti Catalyst for NH3-SCR Reaction

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(8), 336;
Received: 8 July 2018 / Revised: 3 August 2018 / Accepted: 6 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Active Sites in Catalytic Reaction)
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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 ions in 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. View Full-Text
Keywords: Ce-Ti; NH3-SCR; Ce-□-Ti; oxygen vacancies; superoxide ions Ce-Ti; NH3-SCR; Ce-□-Ti; oxygen vacancies; superoxide ions

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Jiang, D.; Zhang, S.; Zeng, Y.; Wang, P.; Zhong, Q. Active Site of O2 and Its Improvement Mechanism over Ce-Ti Catalyst for NH3-SCR Reaction. Catalysts 2018, 8, 336.

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