Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, 150080, PR China.
Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, 150080, PR China.
Chemosphere. 2020 Mar;243:125309. doi: 10.1016/j.chemosphere.2019.125309. Epub 2019 Nov 8.
In the present work, a serial of CuFeCeTiO catalysts are prepared by sol-gel method and applied for NH-SCR of NO, meanwhile CuFeCeTiO shows good low-temperature NH-SCR performance with/without water and an outstanding water resistance. The bulk structure, redox ability, surface acidity and surface species of CuFeCeTiO are measured and discussed by series of characterization in details to illuminate the reasons for the good low-temperature activity and water resistance. The Ce modification can tune the surface acidic distribution, improve the surface oxygen content and surface oxidation reduction cycle (Ce + Fe ↔ Ce + Fe), which contribute the good activity. In addition, the effect of water on NH-SCR performance over CuFeTiO and CuFeCeTiO are investigated emphatically by in situ DRIFTS.
在本工作中，采用溶胶-凝胶法制备了一系列 CuFeCeTiO 催化剂，并将其应用于 NH-SCR 脱硝反应中。CuFeCeTiO 催化剂在有水和无水条件下均表现出良好的低温 NH-SCR 性能和优异的抗水性。通过一系列详细的表征，对 CuFeCeTiO 的体相结构、氧化还原能力、表面酸性质和表面物种进行了测试和讨论，阐明了其低温活性和抗水性好的原因。Ce 改性可以调节表面酸性分布，提高表面氧含量和表面氧化还原循环（Ce+Fe↔Ce+Fe），从而提高了活性。此外，还通过原位 DRIFTS 技术重点考察了水对 CuFeTiO 和 CuFeCeTiO 上 NH-SCR 性能的影响。
