Citation: GAO Lin-Xin, JIANG Xin, GUO Sen. MnO_x/CeO₂/SiO₂ Catalysts Prepared by Adsorption Phase Reaction Technique for Selective Catalytic Reduction of NO_x at Low-Temperature[J]. Acta Physico-Chimica Sinica, ;2014, 30(7): 1303-1308. doi: 10.3866/PKU.WHXB201405062 shu

MnO_x/CeO₂/SiO₂ Catalysts Prepared by Adsorption Phase Reaction Technique for Selective Catalytic Reduction of NO_x at Low-Temperature

GAO Lin-Xin ¹ ,
JIANG Xin ^1, ,
GUO Sen ²

1.
1. Department of Chemical & Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China;
2. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P. R. China

Received Date: 27 February 2014
Available Online: 6 May 2014
Fund Project:

MnO_x/CeO₂/SiO₂ catalysts were prepared by the adsorption phase reaction technique and were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and Raman spectroscopy. HRTEM showed that MnO_x and CeO₂ particles were uniformly coated on the surface of SiO₂. The XRD spectra showed that the intensity of the Mn₃O₄ diffraction peaks gradually decreased and then completely disappeared with the increasment of the CeO₂ content, which indicated that CeO₂ reduced the crystallinity of MnO_x and improved the dispersibility of MnO_x. Raman spectroscopy indicated that Mn ions on the surface of catalysts could enter into the lattice of CeO₂, replace oxygen ions, and form oxygen vacancies. With the increasment of CeO₂ content, the density of oxygen vacancies initially increased and then decreased. We used the catalysts for selective catalytic reduction (SCR) of NO_x with NH₃. The catalytic activity initially increased and then decreased with the increasment of CeO₂ content, similar to the change in the density of oxygen vacancies. Thus, the catalytic activity of the MnO_x/CeO₂/SiO₂ catalysts increases with increasing the density of oxygen vacancies.
- MnO_x/CeO₂/SiO₂ catalyst,
- Low temperature,
- Selective catalytic reduction,
- Oxygen vacancies,
- Adsorption phase reaction technique
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MnOx/CeO2/SiO2 Catalysts Prepared by Adsorption Phase Reaction Technique for Selective Catalytic Reduction of NOx at Low-Temperature

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MnO_x/CeO₂/SiO₂ Catalysts Prepared by Adsorption Phase Reaction Technique for Selective Catalytic Reduction of NO_x at Low-Temperature