MoS_2 samples with controllable morphologies and structures were synthesized using surfactantassisted hydrothermal processes.The effects of surfactants（PEG,PVP,P123,SDS,AOT,and CTAB）on the morphologies and structure...MoS_2 samples with controllable morphologies and structures were synthesized using surfactantassisted hydrothermal processes.The effects of surfactants（PEG,PVP,P123,SDS,AOT,and CTAB）on the morphologies and structures of MoS_2 samples were investigated.The results revealed that spherical,bulk-like,and flower-like MoS_2 particles assembled by NH4~＋-intercalated MoS_2 nano-sheets were synthesized.The morphologies of the MoS_2 samples and their structures（including the slab length and the number of stacked layers） of MoS_2 nano-sheets in these samples could be controlled by adjusting the surfactants.Mono-dispersed spherical MoS_2 particles could be synthesized with PEG via the creation of MoS_2 nano-sheets with slab lengths shorter than 15 nm and fewer than six stacked layers.Possible formation mechanisms of these MoS_2 samples created via surfactant-assisted hydrothermal processes are proposed.Further,the catalytic activities of MoS_2 samples for anthracene hydrogenation were evaluated in a slurry-bed reactor.The catalyst synthesized with the surfactant PEG exhibited the highest catalytic hydrogenation activity.Compared with the other catalysts,it had a smaller particle size,mono-dispersed spherical morphology,shorter slab length,and fewer stacked layers;these were all beneficial to exposing its active edges.This work provides an efficient approach to synthesize transition metal sulfides with controllable morphologies and structures.展开更多
基金supported by the National Natural Science Foundation of China(21303186)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA07020300)~~
文摘MoS_2 samples with controllable morphologies and structures were synthesized using surfactantassisted hydrothermal processes.The effects of surfactants（PEG,PVP,P123,SDS,AOT,and CTAB）on the morphologies and structures of MoS_2 samples were investigated.The results revealed that spherical,bulk-like,and flower-like MoS_2 particles assembled by NH4~＋-intercalated MoS_2 nano-sheets were synthesized.The morphologies of the MoS_2 samples and their structures（including the slab length and the number of stacked layers） of MoS_2 nano-sheets in these samples could be controlled by adjusting the surfactants.Mono-dispersed spherical MoS_2 particles could be synthesized with PEG via the creation of MoS_2 nano-sheets with slab lengths shorter than 15 nm and fewer than six stacked layers.Possible formation mechanisms of these MoS_2 samples created via surfactant-assisted hydrothermal processes are proposed.Further,the catalytic activities of MoS_2 samples for anthracene hydrogenation were evaluated in a slurry-bed reactor.The catalyst synthesized with the surfactant PEG exhibited the highest catalytic hydrogenation activity.Compared with the other catalysts,it had a smaller particle size,mono-dispersed spherical morphology,shorter slab length,and fewer stacked layers;these were all beneficial to exposing its active edges.This work provides an efficient approach to synthesize transition metal sulfides with controllable morphologies and structures.
基金supported by the National Natural Science Foundation of China (21377008)2013 Education and Teaching-Postgraduate Students Education-2011 Beijing Municipality Excellent Ph.D.Thesis Supervisor (20111000501)+1 种基金2013 Education and Teaching-Postgraduate Students Cultivation-National Excellent Ph.D.Thesis Supervisor and Cultivation Base Construction (005000542513551)the Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions~~
文摘采用乙二胺辅助的水热法制备了纳米片聚结的Co3O4微球.利用多种分析技术表征了其物化性质,并评价了其对甲苯燃烧的催化活性.结果表明,由添加1.0 ml乙二胺经140°C水热处理12 h后制得的Co3O4样品呈纳米片聚结的微球状表面形貌.Co3O4微球样品的比表面积约为66 m2g-1.与体相Co3O4样品相比,Co3O4微球样品具有较高的氧吸附物种浓度和较好的低温还原性.当空速为20000 ml g-1h-1时,在Co3O4微球样品上甲苯转化率达到50%和90%时的反应温度分别为230和254°C.这与该样品具有较大的比表面积、较高的氧吸附物种浓度和较好的低温还原性相关.
