Wang Qiaoyun, Xu Hailong, Huang Wentao, Pan Zhiquan, Zhou Hong
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, People's Republic of China.
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, People's Republic of China.
J Hazard Mater. 2019 Feb 15;364:499-508. doi: 10.1016/j.jhazmat.2018.10.067. Epub 2018 Oct 25.
Porous CuO/CuO heterostructure was successfully synthesized through a metal organic frameworks (MOFs)-assisted template method. Tunable production of pure phase CuO and CuO could be achieved by regulating the coordination environment of copper. The copper oxides inherited the polyhedral morphology from the Cu MOFs and possessed higher surface area and larger pore volume. Compared with pure CuO and CuO, heterostructured CuO/CuO displayed remarkably enhanced NH-SCR de-NO activity and N selectivity in a low temperature range of 170-220 °C. Systematical in situ DRIFT characterization revealed that the NH-SCR of NO over CuO/CuO heterostructure followed Eley-Rideal (E-R) mechanism, which was greatly improved by the abundant Lewis acid sites, improved O adsorption and the synergistic effect between Cu and Cu. In addition, CuO/CuO heterostructure exhibited excellent HO, SO, alkali metals, and hydrocarbon durability, indicating its potential use in industrial NH-SCR of NO.
通过金属有机框架（MOFs）辅助模板法成功合成了多孔CuO/CuO异质结构。通过调节铜的配位环境可以实现纯相CuO和CuO的可调制备。氧化铜继承了铜MOFs的多面体形态，具有更高的比表面积和更大的孔体积。与纯CuO和CuO相比，异质结构的CuO/CuO在170-220°C的低温范围内表现出显著增强的NH-SCR脱硝活性和N选择性。系统的原位漫反射红外傅里叶变换光谱（DRIFT）表征表明，CuO/CuO异质结构上NO的NH-SCR遵循Eley-Rideal（E-R）机理，丰富的路易斯酸位点、改善的O吸附以及Cu和Cu之间的协同效应极大地促进了该机理。此外，CuO/CuO异质结构表现出优异的抗H₂O、SO₂、碱金属和烃类耐久性，表明其在工业NO的NH-SCR中的潜在应用。
