一种用于NH₃选择性催化还原NO的具有高活性和抗SO₂性能的优质Fe-V-Ti催化剂。
A superior Fe-V-Ti catalyst with high activity and SO resistance for the selective catalytic reduction of NO with NH.
作者信息
Zhu Na, Shan Wenpo, Lian Zhihua, Zhang Yan, Liu Kuo, He Hong
机构信息
Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ningbo Urban Environment Observation and Research Station-NUEORS, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China.
出版信息
J Hazard Mater. 2020 Jan 15;382:120970. doi: 10.1016/j.jhazmat.2019.120970. Epub 2019 Aug 9.
A series of Fe-V-Ti oxide catalysts were prepared by a co-precipitation method, among which the FeVTiO catalyst showed the optimal NH-SCR performance and excellent SO resistance. FeVTiO achieved > 90% NO conversion at 225-450 °C under a GHSV of 200,000 h. When introducing SO and HO to the SCR reaction for 24 h, the NO conversion maintained a level above 93% at 250 °C. The Raman and Mössbauer spectra showed that FeVO and FeO coexisted on the surface of TiO. In Fe-V-Ti catalysts, the charge interaction between FeO and FeVO as well as the electronic inductive effect between Fe and V species resulted in the improvement of SCR activity and N selectivity at high temperatures. The NH-SCR process on the FeVTiO catalyst mainly followed the Eley-Rideal (E-R) reaction mechanism with gaseous NO reacting with adsorbed NH adsorbed species.
通过共沉淀法制备了一系列Fe-V-Ti氧化物催化剂，其中FeVTiO催化剂表现出最佳的NH-SCR性能和优异的抗SO性能。在200,000 h的空速下，FeVTiO在225-450°C时实现了>90%的NO转化率。当将SO和H₂O引入SCR反应24小时时，在250°C下NO转化率保持在93%以上。拉曼光谱和穆斯堡尔光谱表明，FeVO₄和Fe₂O₃共存于TiO₂表面。在Fe-V-Ti催化剂中，Fe₂O₃与FeVO₄之间的电荷相互作用以及Fe与V物种之间的电子诱导效应导致了高温下SCR活性和N₂选择性的提高。FeVTiO催化剂上的NH-SCR过程主要遵循Eley-Rideal（E-R）反应机理，气态NO与吸附的NH₃吸附物种反应。
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