Doping effect of cations (Zr4+, Al3+, and Si4+) on MnOx/CeO2 nano-rod catalyst for NH3-SCR reaction at low temperature

doi:10.1016/S1872-2067(18)63204-8

Abstract

Abstract:

Thermally stable Zr⁴⁺, Al³⁺, and Si⁴⁺ cations were incorporated into the lattice of CeO₂ nano-rods (i.e., CeO₂-NR) in order to improve the specific surface area. The undoped and Zr⁴⁺, Al³⁺, and Si⁴⁺ doped nano-rods were used as supports to prepare MnO_x/CeO₂-NR, MnO_x/CZ-NR, MnO_x/CA-NR, and MnO_x/CS-NR catalysts, respectively. The prepared supports and catalysts were comprehensively characterized by transmission electron microscopy (TEM), high-resolution TEM, X-ray diffraction, Raman and N₂-physisorption analyses, hydrogen temperature-programmed reduction, ammonia temperature-programmed desorption, in situ diffuse reflectance infrared Fourier-transform spectroscopic analysis of the NH₃ adsorption, and X-ray photoelectron spectroscopy. Moreover, the catalytic performance and H₂O+SO₂ tolerance of these samples were evaluated through NH₃-selective catalytic reduction (NH₃-SCR) in the absence or presence of H₂O and SO₂. The obtained results show that the MnO_x/CS-NR catalyst exhibits the highest NO_x conversion and the lowest N₂O concentration, which result from the largest number of oxygen vacancies and acid sites, the highest Mn⁴⁺ content, and the lowest redox ability. The MnO_x/CS-NR catalyst also presents excellent resistance to H₂O and SO₂. All of these phenomena suggest that Si⁴⁺ is the optimal dopant for the MnO_x/CeO₂-NR catalyst.

Key words: MnO_x/CeO₂ nano-rod catalyst, Doping effect, Oxygen vacancy, Surface acidity, Low-temperature NH₃-SCR reaction

Xiaojiang Yao, Jun Cao, Li Chen, Keke Kang, Yang Chen, Mi Tian, Fumo Yang. Doping effect of cations (Zr⁴⁺, Al³⁺, and Si⁴⁺) on MnO_x/CeO₂ nano-rod catalyst for NH₃-SCR reaction at low temperature[J]. Chinese Journal of Catalysis, 2019, 40(5): 733-743.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63204-8

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Doping effect of cations (Zr⁴⁺, Al³⁺, and Si⁴⁺) on MnO_x/CeO₂ nano-rod catalyst for NH₃-SCR reaction at low temperature

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