Synthesis of novel MnOx@TiO2 core-shell nanorod catalyst for low-temperature NH3-selective catalytic reduction of NOx with enhanced SO2 tolerance

doi:10.1016/S1872-2067(18)63059-1

Abstract

Abstract:

In this study, a MnO_x@TiO₂ core-shell catalyst prepared by a two-step method was used for the low-temperature selective catalytic reduction of NO_x with NH₃. The catalyst exhibits high activity, high stability, and excellent N₂ selectivity. Furthermore, it displays better SO₂ and H₂O tolerance than its MnO_x, TiO₂, and MnO_x/TiO₂ counterparts. The prepared catalyst was characterized systematically by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, NH₃ temperature-programmed desorption and H₂ temperature-programmed reduction analyses. The optimized MnO_x@TiO₂ catalyst exhibits an obvious core-shell structure, where the TiO₂ shell is evenly distributed over the MnO_x nanorod core. The catalyst also presents abundant mesopores, Lewis-acid sites, and high redox capability, all of which enhance its catalytic performance. According to the XPS results, the decrease in the number of Mn⁴⁺ active centers after SO₂ poisoning is significantly lower in MnO_x@TiO₂ than in MnO_x/TiO₂. The core-shell structure is hence able to protect the catalytic active sites from H₂O and SO₂ poisoning.

Key words: Low-temperature selective catalytic reduction, Core-shell, Nanorod, SO₂ resistance, MnO_x

Zhongyi Sheng, Dingren Ma, Danqing Yu, Xiang Xiao, Bingjie Huang, Liu Yang, Sheng Wang. Synthesis of novel MnO_x@TiO₂ core-shell nanorod catalyst for low-temperature NH₃-selective catalytic reduction of NO_x with enhanced SO₂ tolerance[J]. Chinese Journal of Catalysis, 2018, 39(4): 821-830.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63059-1

https://www.cjcatal.com/EN/Y2018/V39/I4/821

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Synthesis of novel MnO_x@TiO₂ core-shell nanorod catalyst for low-temperature NH₃-selective catalytic reduction of NO_x with enhanced SO₂ tolerance

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