LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0.

Lei Yi,Caiting Li,Mi Li,Yingyun Liu,Jinke Xie,Lei Gao,Jian Shan,Junwen Lv

doi:10.1007/s11356-021-15752-y

Lei Yi, Caiting Li + Show 6 more

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https://doi.org/10.1007/s11356-021-15752-y

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Abstract

A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for simultaneous abatement of NO and Hg0. 15%LaMn/BAC manifested excellent removal efficiency of Hg0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg0 removal and NO removal was explored; thereinto, Hg0 removal had no influence on NO removal, while NO removal preponderated over Hg0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg0 removal. The physicochemical characterization of related samples was characterized by SEM, XRD, BET, H2-TPR, NH3-TPD, and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species, and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. The results indicated that 15%LaMn/BAC was a promising catalyst for simultaneous abatement of Hg0 and NO at low temperature.

Highlights

With the implementation of the ultra-low emission and energy saving of coal-fired power plant plan since 2015 in China, electrostatic precipitator (ESP) or fabric filter (FF) system, wet flue gas desulfurization (WFGD) unit and selective catalytic reduction (SCR) devices have been extensively adopted for corresponding pollutants abatement (Liu et al, 2018; Zhao et al, 2019a; Gao et al, 2018a)
That could be interpreted as the deposition of metal oxides in preexisting pores, and the destruction of thin pore walls in the impregnation and calcination processes (Ma et al, 2015a; Xie et al, 2015). It was well-known that increasing the loading value of metal oxides might arouse their agglomerated effect, which was in accordance with X-ray diffraction (XRD) and SEM results
It was worth mentioned that 15%LaMn/BAC revealed bigger total pore volume and BET surface area than those of 15%La/BAC and 15%Mn/BAC, which might be ascribed to a strong interaction derived from LaOx and manganese oxides (MnOx), the phenomenon indicated that the addition of

Summary

Introduction

With the implementation of the ultra-low emission and energy saving of coal-fired power plant plan since 2015 in China, electrostatic precipitator (ESP) or fabric filter (FF) system, wet flue gas desulfurization (WFGD) unit and selective catalytic reduction (SCR) devices have been extensively adopted for corresponding pollutants abatement (Liu et al, 2018; Zhao et al, 2019a; Gao et al, 2018a). It is well recognized that elemental mercury (Hg0), oxidized mercury (Hg2+) and particle-bound mercury (Hgp) coexist in coal-fired flue gas (Wang et al, 2017; Yang et al, 2019a). The emphasis and difficulty of eliminating mercury pollution lie in controlling Hg0 emission

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