He Jiaqin, Chen Dongyun, Li Najun, Xu Qingfeng, Li Hua, He Jinghui, Lu Jianmei
College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Sushou, Jiangsu, P.R. China.
ChemSusChem. 2019 Mar 7;12(5):1084-1090. doi: 10.1002/cssc.201802501. Epub 2019 Feb 1.
Catalytic performance is heavily dependent on how the structures of nanomaterials are designed. Co O -CeO composite nanotubes with open ends and mesoporous structures were fabricated through a facile and environmentally friendly reaction. The mesoporous Co O nanotubes were synthesized by the calcination of cobalt-aspartic acid (Co-Asp) nanowires and coated with a CeO shell. The composite nanotubes were characterized by SEM, TEM, XRD, and X-ray photoelectron spectroscopy. The composite materials comprise a combination of Co O nanotubes and CeO nanoparticles with a hollow and mesoporous bimetallic oxide structure. The large BET surface area led to a higher degree of accessible active sites compared with other Co O -CeO composite nanomaterials with other structures. The resulting Co O -CeO -26.3 wt % composite nanotubes, with a CeO content of approximately 26.3 wt %, achieved 100 % CO conversion at 145 °C. Additionally, the synergistic effect between the two metal oxides comprising the Co O -CeO composite nanotubes was demonstrated by the enhanced catalytic activity compared with pure Co O nanotubes and CeO nanoparticles.
催化性能在很大程度上取决于纳米材料的结构设计方式。通过一种简便且环保的反应制备了具有开口端和介孔结构的CoO -CeO复合纳米管。介孔CoO纳米管是通过煅烧钴-天冬氨酸（Co-Asp）纳米线合成的，并包覆有CeO壳层。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和X射线光电子能谱对复合纳米管进行了表征。复合材料由CoO纳米管和CeO纳米颗粒组成，具有中空和介孔双金属氧化物结构。与其他具有其他结构的CoO -CeO复合纳米材料相比，较大的比表面积导致可及活性位点的程度更高。所得CeO含量约为26.3 wt%的CoO -CeO -26.3 wt %复合纳米管在145 °C时实现了100 %的CO转化率。此外，与纯CoO纳米管和CeO纳米颗粒相比，CoO -CeO复合纳米管中两种金属氧化物之间的协同效应通过增强的催化活性得到了证明。
