摘要
采用原位限域生长策略制备了一系列有序介孔碳负载的超小MoO_(3)纳米颗粒复合物(OMC-US-MoO_(3)).其中,有序介孔碳被用作基质来原位限域MoO_(3)纳米晶的生长.依此方法制备的MoO_(3)纳米晶具有超小的晶粒尺寸(<5 nm),并在介孔碳骨架内具有良好的分散度.制得的OMC-US-MoO_(3)复合物具有可调的比表面积(428~796 m^(2)/g)、孔容(0.27~0.62 cm^(3)/g)、MoO_(3)质量分数(4%~27%)和孔径(4.6~5.7 nm).当MoO_(3)纳米晶的质量分数为7%时,所得样品OMC-US-MoO_(3)-7具有最大的孔径、最小的孔壁厚度和最规整的介观结构.该样品作为催化剂时,表现出优异的环辛烯选择性氧化性能.
Ultrasmall particle sizes and excellent dispersity of the MoO_(3)active species on support majorly dominate their catalytic performances.Herein,a series of ordered mesoporous carbon support ultrasmall molybdena nanoparticles(OMC-US-MoO_(3))composites was synthesized through an in situ confinement growth strategy.Ordered mesoporous carbon was used as the matrix to in situ confine the growth of MoO_(3)nanocrystals.The obtained MoO_(3)nanocrystals show ultrasmall particle sizes(<5 nm)and excellent dispersity on the meso-porous carbon frameworks.The obtained OMC-US-MoO_(3)exhibits tunable specific surface areas(428-796 m^(2)/g),pore volumes(0.27-0.62 cm^(3)/g),MoO_(3)contents(4%-27%,mass fraction)and uniform pore sizes(4.6―5.7 nm).As a typical example,the obtained sample with 7%MoO_(3)(denoted as OMC-US-MoO_(3)-7)shows the largest pore size,smallest thickness of pore wall and most regular mesostructures.When being used as a catalyst,the OMC-US-MoO_(3)-7 exhibits an excellent catalytic activity for selective oxidation of cyclooctene with a high stability.
作者
王常耀
王帅
段林林
朱晓航
张兴淼
李伟
WANG Changyao;WANG Shuai;DUAN Linlin;ZHU Xiaohang;ZHANG Xingmiao;LI Wei(Department of Chemistry,Fudan University,Shanghai 200433,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第5期1589-1597,I0005,共10页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21975050)
国家重点研发计划纳米科技重点专项(批准号:2016YFA0204000,2018YFE0201701)
中国博士后科学基金(批准号:2019M651342)资助.
关键词
有序介孔碳
氧化钼纳米晶
纳米材料
限域生长
Ordered mesoporous carbon
MoO_(3)nanocrystal
Nanomaterials
Confinement growth
