作者：JieWan,JiaweiChen,RuZhao,RenxianZhou 单位：EnergyResearchInstitute,NanjingInstituteofTechnology；InstituteofCatalysis,ZhejiangUniversity 本文刊于： 《Journal of Environmental Sciences》 2021年第02期
关键词:
NH3-SCR Fe/Cu-SSZ-13 One-potsynthesis AcKeywords
NH3-SCR, Fe/Cu-SSZ-13, One-pot synthesis, Active species
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摘要
Series of Fe/Cu-SSZ-13 catalysts with different Fe loading content were synthesized by simple one-pot strategy. The obtained catalysts were subjected to selective catalytic reduction（SCR） of NO x with NH 3 and were characterized by various techniques. The results show that Fe 0.63/Cu 1.50-SSZ-13 catalyst with proper Fe content exhibits excellent catalytic activity with widest operation temperature window from 160 to 580 °C, excellent hydrothermal stability as well as good resistance to sulfur poisoning when compared with Cu-SSZ-13, signifying its great potential for practical applications. Further characterizations reveal that the synthesized Fe/Cu-SSZ-13 catalysts present typical chabazite（CHA） structure with good crystallinity, while isolated Cu 2+ and monomeric Fe 3+ are revealed as the predominant copper and iron species. At low temperatures, isolated Cu 2+ species act as primary active sites for SCR reaction, while monomeric Fe 3+ species provide sufficient active sites for sustain the SCR activity at high temperature. Moreover, Fe over doping would lead to the damage of zeolite structure, destruction of isolated Cu 2+ site, as well as the formation of highly oxidizing Fe2O3, thus causing deterioration of catalytic performances.
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