纳米二硫化钼的制备及其蒽加氢性能  

Surfactant-Assisted Synthesis of MoS_2 Nano-Sheets and Their Catalytic Activity in Anthracene Hydrogenation

作　　者：李敏[1,2] 刘忠杉 王冬娥 潘振栋[1] 马怀军[1] 姜玉霞[1,2] 田志坚[1] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049 [3]新疆独山子天利实业总公司,新疆独山子833699

出　　处：《石油学报（石油加工）》2018年第2期253-260,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21303186);中国科学院战略性先导科技专项项目(XDA07020300)资助

摘　　要：以四硫代钼酸铵做前驱体,表面活性剂辅助水热合成纳米MoS_2。考察了4种表面活性剂对合成的纳米MoS_2结构、尺寸及排列方式的影响。结果表明,不同表面活性剂辅助所得样品均为插层结构2H-MoS_2纳米片,插入物为NH_4^+和表面活性剂。不同样品中纳米片的层间距、表面活性剂插入量、纳米片的尺寸、排列方式均不同,可通过添加表面活性剂控制纳米片的结构、尺寸及排列方式。其中,聚乙烯吡咯烷酮(PVP)辅助所得样品中纳米片层间距最小,PVP的插入量最大,纳米片尺寸最小(堆积层数为1~2层,长度为5~10nm),几乎无团聚。PVP辅助所得样品具有最高的蒽加氢活性,深度加氢产物8HN的选择性和蒽的加氢转化率分别为65.1%和46.8%。MoS_2催化剂的加氢活性与其比表面积无直接相关,与暴露棱边活性位成正相关。Nano-MoS_2 was synthesized via a surfactant-assisted hydrothermal route, using(NH_4)_2MoS_4 as the precursor.Effects of surfactants(PVP,CTAB,PEG,AOT)on the morphology and structure of MoS_2 samples were investigated.The results reveal that 2H-MoS_2 nano-sheets,intercalated with NH_4^+ and surfactants,are prepared with various surfactants.However,the interlayer distance,the size(including the stacking layers and the slab length)and arrangement,and the amount of intercalated surfactants of these nano-sheets are different.Highly dispersed nano-sheet prepared with PVP has the smallest interlayer distance and size,with the slab length of 5-10 nm and the stacking layers of 1-2.The size and arrangement of nano-sheets can be controlled by adjusting surfactants. The catalytic activity of MoS_2 samples in anthracene hydrogenation was evaluated in a slurry-bed reactor.The evaluation results show that MoS_2 sample with PVP exhibits the highest catalytic activity in anthracene hydrogenation.The 8 HN selectivity and the hydrogenation conversion is 65.1% and 46.8%,respectively.The activity of MoS_2 catalysts is closely associated to the exposure of active edges.The shorter slab and fewer stacking layers of nano-sheets have much more active edges.The higher dispersion of these nano-sheets benefits to expose much more active edges.

关 键 词：MOS2 四硫代钼酸铵 表面活性剂 棱边位 蒽加氢 

分 类 号：TQ426.95[化学工程]