采用水热合成法制备金属有机骨架MIL-125(Ti),利用浸渍法负载Cu于MIL-125(Ti)上制成xCu-MIL-125(Ti)催化剂,并在固定床微反应器上评估其催化CO还原NO的性能。结果表明,MIL-125(Ti)的高比表面积及微孔隙促进了Cu的高度分散,使催化剂拥有优异的SCR-CO性能。其中,6.2Cu-MIL-125(Ti)在有氧、325℃条件下的NO转化率为90%,N₂选择性为92%。通过多种表征手段来探究其基础物理化学性质与反应机理。结果表明,催化剂中金属骨架结构与TiO₂结构共存是影响还原效率的主要因素;MIL-125(Ti)是一种微、介孔材料,且具有高比表面积及均匀孔径分布,适合负载与吸附。催化剂的催化性能主要由Cu²⁺还原为Cu⁺、再由Cu⁺还原为Cu⁰的路径决定。

MIL-125(Ti),a metal organic framework,is prepared via hydrothermal synthesis method,on which Cu is supported through impregnation method to obtain xCu-MIL-125(Ti) catalyst.The reactivity of xCu-MIL-125(Ti) catalyst is evaluated in selective catalytic reduction of NO by CO (SCR-CO) in a fixed bed microreactor.It is verified that the large specific surface area and micropores of MIL-125(Ti) promotes Cu species to disperse greatly,making the catalyst have an outstanding SCR-CO performance.Among the results,90% of NO conversion and 92% of N₂ selectivity are proved over 6.2Cu-MIL-125(Ti) catalyst at 325℃ in oxygen-rich environment.A number of characterization techniques are employed to explore the basic physical-chemical properties and the reaction mechanism.The results show that metal organic frame structure and TiO₂ structure coexists in the catalyst,which forms the major factor to influence the NO reduction efficiency.MIL-125(Ti) is a micro- and mesoporous material with high specific surface area and uniform pore size distribution,which is suitable for loading and adsorption.The catalytic performance of the catalyst is mainly subject to the path of Cu²⁺ reduction to Cu⁺ and then Cu⁺ to Cu⁰.

黄嘉玮(1998-),男,硕士生,主要从事能源清洁利用方面的研究,dhuhjw9806@163.com