【作者】 章凡玉； 程修艳； 谭秀娘； 刘力菲； 张建玲；

【Author】 Fanyu Zhang;Xiuyan Cheng;Xiuniang Tan;Lifei Liu;Jianling Zhang;The Key Laboratory of Colloid,Interface and Thermodynamics,Institute of Chemistry,Chinese Academy of Sciences;

【机构】 胶体界面与化学热力学院重点实验室中国科学院化学研究所；

【摘要】 金属-有机框架（MOF）是一类由金属离子或金属团簇通过有机配体连接而成的多孔材料,在气体存储、气体的净化分离、非均相催化等领域有着广泛的应用。但由于其本身的活性较低,作为非均相催化剂仍受到很大的限制。一般通过将金属纳米粒子负载在MOF材料的外表面来解决这一难题。但是,金属粒子在催化剂表面易发生聚集,从而导致催化剂活性和稳定性降低。本工作采用超临界流体作为反应介质,制备了高介孔的Ru-MIL-125-NH₂材料。利用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、氮气吸附-脱附等表征手段对Ru-MIL-125-NH₂的形貌和孔性质进行了表征。研究表明,Ru-MIL-125-NH₂具有较高的孔隙率,同时该材料具有适宜的能带结构、较高的可见光吸附能力,在可见光条件下对光催化水裂解反应具有较高的催化性能。更多还原

【Abstract】 Metal-organic frameworks （MOFs）,a kind of porous material composed of metal ions or metal clusters connected by organic ligands,have been widely used in gas storage,gas purification and separation,heterogeneous catalysis.Despite many promising advantages,the applications of MOFs in catalytic reactions are still largely restricted,mainly in terms of their intrinsically low activity.To overcome the limitations,the deposition of catalytically active nanoparticles on MOF is the mostly adopted method.Unfortunately,MOF composite catalysts suffer from nanoparticle aggregation,resulting in reduced catalytic activity and instability for recycling.Here we propose the formation of Ru-coordinated MOF with a hierarchically meso-and microporous structure by a supercritical fluid route.The morphology and porosity properties of Ru-MIL-125-NH₂ were characterized by transmission electron microscope,scanning electron microscope and N₂ adsorption-desorption measurement.Such a photocatalyst has the preferable electronic structure,improved visible-light adsorption ability and high porosity for facilitating mass transport.This study opens up new opportunity for improving the catalytic performances of MOFs by modifying their microstructures through a supercritical fluid route.更多还原