首页|Low-temperature deNOx performance and mechanism:a novel FeVO4/CeO2 catalyst for iron ore sintering flue gas
Low-temperature deNOx performance and mechanism:a novel FeVO4/CeO2 catalyst for iron ore sintering flue gas
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Developing deNOx catalysts with lower activity temperatures range significantly reduces NH3 selective catalytic reduction(SCR)operating costs for low-temperature industrial flue gases.Herein,a novel FeVO4/CeO2 catalyst with great low-temperature NH3-SCR and nitrogen selectivity was synthesized using a dipping method.Characterization techniques such as X-ray diffraction,Raman spectroscopy,specific surface and porosity analysis,H2 temperature-programmed reduction,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy,and the in situ diffused reflectance infrared Fourier transform spectroscopy were used to investigate the catalytic mechanism.An appropriate addition for FeVO4 in the catalyst was 5 wt.％from the results,and the active substance content reached the maximum dispersal capacity of the carrier.The NOx conversion exceeded 90％,and the nitrogen selectivity was more than 98％over this catalyst at 200-350℃.The activity was kept at 88％after 7.5 h of reaction at 200℃ for 7.5 h in 35 mg m-3 SO2 gas.The remarkable deNOx activity,nitrogen selectivity,and sulphur resistance performances are attributed to the low redox temperature,the abundance of medium-strong acid and strong acid sites,the sufficient adsorbed oxygen,and the superior Fe2+content on the surface.The Langmuir-Hinshelwood mechanism was observed on the FeVO4/CeO2 catalyst in the NH3 selective catalytic reduction of NOx.
Long Ding、He-xi Zhao、Ke Cheng、Li-xin Qian、Peng-yu Qi、Qi Shi、Hong-ming Long
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School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China
Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology),Ministry of Education,Ma'anshan 243002,Anhui,China
Engineering Technology Training Center,Nanjing Vocational University of Industry Technology,Nanjing 21000,Jiangsu,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaOutstanding Youth Fund of Anhui ProvinceNatural Science Foundation of the Jiangsu Higher Education Institutions of China
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