Mn-Ce 负载型飞灰催化剂脱硝脱硫性能研究。
Study on denitration and sulfur removal performance of Mn-Ce supported fly ash catalyst.
机构信息
Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an University of Science and Technology, Xi'an, 710054, China; Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi'an, 710021, China.
Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an University of Science and Technology, Xi'an, 710054, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, 710048, China.
出版信息
Chemosphere. 2021 May;270:128646. doi: 10.1016/j.chemosphere.2020.128646. Epub 2020 Oct 15.
Nitrogen oxides (NOx) are the main pollutants of air, which mainly come from the combustion of coal and fossil fuels. In this paper, with fly ash used as the catalyst carrier, the effects on the denitration and sulfur resistance of Mn-Ce loading sequence and molar ratio were studied. The catalyst was characterized and analyzed by XRD, XPS, SEM. The results show that when Mn-Ce bimetal is loaded at the same time, Mn ions enter the CeO lattice to form a solid solution of Mn-O-Ce fluorite structure, which makes the catalyst has the best denitration and sulfur resistance. The catalyst denitration performance increases first and then decreases with the increase of Mn-Ce molar ratio. When Mn-Ce is 1:1, the denitration efficiency is higher, the total conversion rate of NO is the highest and the deactivation time is the longest, the catalyst is resistant to sulfur performance is also the best.
氮氧化物（NOx）是空气的主要污染物，主要来自煤和化石燃料的燃烧。本文以粉煤灰为催化剂载体，研究了 Mn-Ce 负载顺序和摩尔比对脱硝和抗硫性能的影响。采用 XRD、XPS、SEM 对催化剂进行了表征和分析。结果表明，当 Mn-Ce 双金属同时负载时，Mn 离子进入 CeO 晶格形成 Mn-O-Ce 萤石结构的固溶体，使催化剂具有最佳的脱硝和抗硫性能。催化剂的脱硝性能随 Mn-Ce 摩尔比的增加先升高后降低。当 Mn-Ce 为 1:1 时，脱硝效率更高，NO 总转化率最高，失活时间最长，催化剂的抗硫性能也最好。
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