【摘要】 采用单分子层剥离-重堆积技术,将聚合羟基锆离子([Zr4(OH)16-n(H2O)8+n]n+)和Co2+加到MoS2单分子层悬浮液中,制得了羟基锆和含钴羟基锆柱撑MoS2复合材料Zr-MoS2和Co/Zr-MoS2(简称柱撑材料),考察了Co2+对柱撑材料的形成及其催化活性的影响。研究结果表明,Zr-MoS2中[Zr4(OH)16-n(H2O)8+n]n+以双层错开方式排列于MoS2层间域中;Co2+的引入使柱撑材料的层间客体离子种类及取向趋于多样化,X射线衍射峰逐渐呈弥散状,层间距由Zr-MoS2的1.612nm减小至1.101nm,平均晶粒粒径减小,比表面积增大。硝基苯催化加氢结果表明,柱撑材料的催化活性是MoS2的2～4倍,其中Co/Zr-MoS2的催化活性高于Zr-MoS2,这与经柱撑后具有活性的MoS2板层的表层边沿比例提高有关。更多还原

【Abstract】 Using exfoliation-restacking technique, Zr-pillared MoS2 composite(Zr-MoS2) and Co2+ doped Zr-MoS2(Co/Zr-MoS2)were prepared. The composites were assembled from exfoliated molybdenum disulfide layers with hydroxyl-Zr ions \Zr4(OH)16-n(H2O)8+n\n+ and Co2+. Influence of doping Co2+ on preparation and catalytic activity of pillared composites was investigated. The hydroxyl-Zr ions are intercalated into interlayer galleries of MoS2 host layers in a bi-layer staggered arrangement status. With increasing of n(Co) ∶n(Zr), XRD peaks of the pillared composites turn broadened, which indicates that the guest species and their arrangements between host layers become complicated. At same time,interlayer spacing of pillared composites decreases from 1.612 nm (Zr-MoS2) to 1.101 nm. Their specific surface area increases while their particle sizes become smaller. In hydrogenation of nitrobenzene,catalytic activities of the pillared composites,Zr-MoS2 and Co/Zr-MoS2 are 2 to 4 times higher than those of the primitive MoS2 and catalytic activity of Co/Zr-MoS2 is better than Zr-MoS2. Such catalytic behavior can attributed to increased ratio of rim active sites of pillared composites.更多还原