TAILIEUCHUNG - Báo cáo hóa học: " Facile preparation of highly-dispersed cobaltsilicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Facile preparation of highly-dispersed cobaltsilicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation | Zhang et al. Nanoscale Research Letters 2011 6 586 http content 6 1 586 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Facile preparation of highly-dispersed cobaltsilicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation 1 2 2 I- - -2 2 1 Qiaohong Zhang Chen Chen Min Wang Jiaying Cai Jie Xu and Chungu Xia Abstract Highly dispersed cobalt-silicon mixed oxide Co-SiO2 nanosphere was successfully prepared with a modified reverse-phase microemulsion method. This material was characterized in detail by X-ray diffraction transmission electron microscopy Fourier transform infrared ultraviolet-visible diffuse reflectance spectra X-ray absorption spectroscopy near-edge structure and N2 adsorption-desorption measurements. High valence state cobalt could be easily obtained without calcination which is fascinating for the catalytic application for its strong oxidation ability. In the selective oxidation of cyclohexane Co-SiO2 acted as an efficient catalyst and good activity could be obtained under mild conditions. Introduction The preparation of a highly dispersed nanosphere with the desired properties has been intensively pursued not only for the fundamental scientific interest of the nanomaterials but also for their wide technological applications. Up to the present different methods such as the Stober method a layer-by-layer deposition a sol-gel process or a hydrothermal method etc. have been developed to prepare a highly dispersed nanosphere 1-5 . Various monocomponent nanospheres including SiO2 Fe2O3 CuO ZnS or metal materials Au and Pt could be successfully obtained 4-8 . These materials showed good properties during utilization in gas sensors biomedicine electrochemistry catalysis etc. Furthermore for the demand of the application much effort has been devoted to prepare a bi- or multicomponent nanocomposite 9-14 . Among these materials silica was often utilized as a carrier to .

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