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The positive effect of siderite-derived α-Fe2O3 during coaling on the NO behavior in the presence of NH3

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Abstract

Siderite is a naturally occurring mineral that can be found extensively in coal. The structural evolution of siderite in the process of coaling and its performance in the transformation of NO in the presence of NH3 were investigated in this work. In addition, the effects of the coexisting component, including vapor, SO2, and the alkali metal K, were also discussed. Heat treatment was performed at 450, 500, 550, 600, and 700 °C to obtain siderite-derived α-Fe2O3, which was then evaluated in de-NOx via the selective catalytic reduction (SCR) of NO with NH3 in a fixed bed. The X-ray diffraction (XRD), the X-ray fluorescence spectrometer (XRF), N2 adsorption-desorption (BET), the X-ray photoelectron spectrometer (XPS), the scanning electron microscope (SEM), and the transmission electron microscope (TEM) were used to investigate the variations in the morphology and structure of the thermally treated siderite. The results showed that siderite was gradually oxidized and decomposed into α-Fe2O3 with a nanoporous structure and large surface area of 27.27 m2 g−1 after calcination under an air atmosphere. The α-Fe2O3 derived from siderite at 500 °C (H500) exhibited an excellent SCR performance, where the NO conversion rate was great than 90% between 250 and 300 °C due to the pore structure and high specific surface area, additional adsorbed oxygen states, abundant oligomeric Fe oxide clusters, and large amount of acid sites. Regardless of the vapor content, SO2 concentration, and reaction temperature, the α-Fe2O3 derived from siderite at 500 °C (H500) still favored the conversion of NO. When the reaction temperature was lower than 350 °C, H500 favored the conversion of NO even in the presence of an alkali metal (K). The experimental data demonstrated the positive effect of siderite-derived α-Fe2O3 in SCR technology and provided insight into NO behavior in coaling flue gas after NH3 injection.

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Funding

This study was financially supported by the National Natural Science Foundation of China (Nos. 41772038, 41672040, 41572029) and Anhui Provincial Natural Science Foundation (1708085MD87).

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Authors and Affiliations

  1. Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China

    Daobing Shu, Haibo Liu, Tianhu Chen, Dong Chen, Xuehua Zou, Can Wang, Mengxue Li & Hanlin Wang

  2. Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China

    Daobing Shu, Haibo Liu, Tianhu Chen, Dong Chen, Xuehua Zou, Can Wang, Mengxue Li & Hanlin Wang

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  1. Daobing Shu
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Correspondence to Haibo Liu.

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Shu, D., Liu, H., Chen, T. et al. The positive effect of siderite-derived α-Fe2O3 during coaling on the NO behavior in the presence of NH3. Environ Sci Pollut Res 27, 12376–12385 (2020). https://doi.org/10.1007/s11356-020-07829-x

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