Abstract
To achieve a low-cost, high-activity denitrification catalyst with excellent water and sulfur resistance, goethite and Ce(SO4)2·4H2O were used to prepare Ce(SO4)2/α-Fe2O3 composite catalyst by the impregnation way and investigated the effect of Ce(SO4)2 on the properties of goethite. Ce(SO4)2/α-Fe2O3 with various preparation conditions for denitration was systematically discussed, and its structure and properties were characterized by XRD, BET, TEM, XPS, H2-TPR, and NH3-TPD methods. The results showed that Ce(SO4)2/α-Fe2O3 over the Ce/Fe molar ratio of 0.02 and calcination temperature of 350 ℃ had excellent catalytic activity, resistance to sulfur, and water properties and stability. When NOx initial concentration was 500 ppm, gas hourly space velocity was 36,000 h−1 and its reaction temperature was 300 ℃; the NOx conversion efficiency was maintained at over 95% along with 300 ppm SO2 and nearly 100% couple with 10% H2O. Its superior performance was mainly attributed to the enhancement of the surface adsorbed oxygen and acidity of α-Fe2O3 by cerium sulfate. The multiple advantages of Ce0.02/α-Fe2O3(350) made it feasible for practical engineering application.
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The financial support was received from Major Science and Technology projects of Anhui Province of China (201903b06020016 and 201903a07020023) and Hefei Key Generic Technology Research and Development Projects (2021GJ064) for the support of this study.
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Huimin Zhou: conceptualization, methodology, investigation, formal analysis, data curation, writing — original draft. Ting Cheng: investigation, formal analysis. Bo Du: investigation. Xuehua Zou: validation, methodology. Qiaoqin Xie: methodology, resources. Tianhu Chen: resources. Chengzhu Zhu: supervision, methodology, conceptualization, validation, writing — review and editing, resources, project administration.
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Zhou, H., Cheng, T., Du, B. et al. Ce(SO4)2/α-Fe2O3 selective catalytic reduction of NOx with NH3: preparation, characterization, and performance. Environ Sci Pollut Res 29, 84421–84433 (2022). https://doi.org/10.1007/s11356-022-21748-z
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DOI: https://doi.org/10.1007/s11356-022-21748-z