In the present work, Ni Ce catalyst was used for the preparation of carbon nanotubes(CNTs) in the atmosphere of partial oxidation of methane(POM). Mainly growing on quartz wool or wall of reactor, the bulk CNTs were o...In the present work, Ni Ce catalyst was used for the preparation of carbon nanotubes(CNTs) in the atmosphere of partial oxidation of methane(POM). Mainly growing on quartz wool or wall of reactor, the bulk CNTs were obtained. Probably CNTs were synthesized by two routes due to the typical reaction conditions of POM. One was that CNTs were produced from the decomposition of CH 4 on the Ni particles. After transported out of the catalyst zone by blowing of feedgas, CNTs adhered to quartz wool or the wall of reactor. Predominately, the other way was that firstly syngas was produced from POM reaction and then CNTs grew from disproportionation of CO in presence of hydrogen. A little remaining oxygen in effluent could remove the other morphologic carbon, so CNTs were easily opened and purified at the same time of growth. This research maybe arouse us to assemble the continuous process of POM and preparation of CNTs. CNTs were applied to be negative materials for lithium battery. The reversible electrical capacity of simulative lithium battery can be increased ca. 20% with adding 10%(in mass fraction) carbon nanotubes into natural graphite. [WT5HZ]展开更多
通过共沉淀法制备铈锆固溶体作为载体,采用等体积、分步浸渍的方法制备了一系列10%Ni-3%La/Ce x Zr1-x O2(x=0、0.16、0.5、0.75、1)催化剂,并将其应用到甲烷部分氧化和甲烷二氧化碳重整耦合制合成气的反应中.对不同Ce/Zr比的催化剂性...通过共沉淀法制备铈锆固溶体作为载体,采用等体积、分步浸渍的方法制备了一系列10%Ni-3%La/Ce x Zr1-x O2(x=0、0.16、0.5、0.75、1)催化剂,并将其应用到甲烷部分氧化和甲烷二氧化碳重整耦合制合成气的反应中.对不同Ce/Zr比的催化剂性能展开研究,采用BET、XRD、H2-TPR、SEM、TG-DSC手段对载体及催化剂进行了表征.结果表明,铈锆固溶体的形成不仅提高了催化剂表面活性组分的分散度,使催化剂表面NiO晶粒尺寸从26.5 nm减到13.7 nm;而且能够加强活性组分与载体之间的相互作用,提高催化剂的热稳定性能;随着Ce/Zr比的增加,催化剂的转化率、选择性及稳定性随之增高,其顺序为:Ni-La/Ce0.75Zr0.25O2>Ni-La/Ce0.5Zr0.5O2>NiLa/Ce0.16Zr0.84O2.展开更多
文摘In the present work, Ni Ce catalyst was used for the preparation of carbon nanotubes(CNTs) in the atmosphere of partial oxidation of methane(POM). Mainly growing on quartz wool or wall of reactor, the bulk CNTs were obtained. Probably CNTs were synthesized by two routes due to the typical reaction conditions of POM. One was that CNTs were produced from the decomposition of CH 4 on the Ni particles. After transported out of the catalyst zone by blowing of feedgas, CNTs adhered to quartz wool or the wall of reactor. Predominately, the other way was that firstly syngas was produced from POM reaction and then CNTs grew from disproportionation of CO in presence of hydrogen. A little remaining oxygen in effluent could remove the other morphologic carbon, so CNTs were easily opened and purified at the same time of growth. This research maybe arouse us to assemble the continuous process of POM and preparation of CNTs. CNTs were applied to be negative materials for lithium battery. The reversible electrical capacity of simulative lithium battery can be increased ca. 20% with adding 10%(in mass fraction) carbon nanotubes into natural graphite. [WT5HZ]
