化工学报2019，Vol.70Issue(12)：4645-4653,9.DOI:10.11949/0438-1157.20190641
SO2对稀土精矿催化剂NH3-SCR脱硝催化性能的影响
Effect of SO2 on catalytic performance of rare earth concentrate catalyst for NH3-SCR denitrification
摘要
Abstract
Sulfur resistance is a key indicator for evaluating catalyst performance during denitration. It is important to study the effect of SO2 on the physicochemical properties of catalysts. The rare earth concentrate catalyst was obtained by roasting the Bayan Obo rare earth concentrate. Using the sulfur resistance test bed of the catalyst and combining scanning electron microscope (SEM), Brunner Emmett Teller(BET), X-ray diffraction (XRD) and in situ Fourier transform infrared spectroscopy (FT-IR), the adsorption of SO2 on the catalyst surface under the atmosphere of O2, NH3 and NO, as well as the influence of different SO2 concentrations on catalytic denitrification were analyzed. The results show that SO2 can significantly promote the denitrification performance of rare earth concentrate catalysts. The NO conversion rate increased from 28% to 50% at 300℃ and increased from 42% to 75% at 350℃. SEM, BET and XRD results illustrated that the surface structure and chemical composition of the catalyst remain unchanged before and after denitrification. The rare earth concentrate had good sulfur resistance. The FT-IR results verified that the adsorption of SO2 increased B acid sites on the surface of the rare earth concentrate catalyst. The adsorption capacity of the catalyst for NH3 was enhanced, contributing to increase catalyst activity. The results can provide valuable basic data reference for the anti-sulfur performance of the Bayan Obo rare earth concentrate catalyst NH3-SCR denitrification application process.关键词
稀土精矿催化剂/SO2/催化剂活性/抗硫性能/NH3吸附Key words
rare earth concentrate catalyst/ SO2/ catalyst activity/ sulfur resistance/ NH3 adsorption分类
化学化工引用本文复制引用
焦坤灵,赵阳国,武文斐,王振峰,龚志军..SO2对稀土精矿催化剂NH3-SCR脱硝催化性能的影响[J].化工学报,2019,70(12):4645-4653,9.基金项目
国家自然科学基金项目(51866013) （51866013）
内蒙古自治区自然科学基金项目(2017MSLH0529) （2017MSLH0529）
