Desulfurization Performance And Preparation Of ZnO With A Diversity Of Morphologies

Nano-zinc oxide has a high desulfurization precision, so it has been a hot topic in the field of fine desulfurization. Although the nano-zinc oxide has many excellent properties, there are still problems such as aggregating easily and so on. Mesoporous or porous nano-zinc oxide with different morphologies can solve the problem of easily aggregatting to a certain extent, and has a larger surface area. Further, ZnO/CNTs composite can improve the dispersion of zinc oxide nanoparticles, and change its properties. In this paper,based on ZnO of various morphologies as desulfurization agents, we has been systemically carried out research on removal of H2 S.ZnO and ZnO/CNTs composite with a diversity of morphologies were prepared by different methods,such as sol-gel method, precipitation method and hydrothermal synthesis method. On the basis of experimental evaluation, characterization and analysis, the performance of ZnO with various morphologies on the removal of H2 S were investigated. The experimental results indicate:(1) ZnO of different morphologies can be prepared by using different methods. In the experiments, the tubular zinc oxide composed of zinc oxide nanosheets,zinc oxide spheres composed of zinc oxide nanosheets,ZnO/CNTs composite composed of zinc oxide nano particle whose crystal size is 27 nm and nano-ZnO that the crystal size is 20 nm, were prepared by different methods. The specific surface area of ZnO with different morphologies is 62.5 m2/g, 82.8 m2/g, 65.7 m2/g and 33.1 m2/g respectively;(2) Mesoporous zinc oxide hollow spheres were obtained by calcining at 300 ?C and prepared by homogeneous precipitation method;(3) ZnO of different morphologies have different desulfurization performances, The H2 S adsorption capacities varied in the order of tubular ZnO>ZnO/CNTs>ZnO microsphere> nano-zinc oxide. The breakthrough sulfur capacity of tubular ZnO is 3.192. Within the scope of the experiment, the H2 S removal performance of tubular ZnO is the best;(4) Within the scope of the experiment, the desulfurization performance under high temperature conditions(300 ?C) is superior to that of(25 ?C) low temperature conditions.There are various reasons for ZnO of different morphologies with different desulfurization performances, according to the documents, we extrapolates it is mainly decided by their structures and surface characteristics. The results showed that, within the scope of the experiment, zinc oxide desulfurizer composed of nanosheets and with large specific surface area and structural stability has higher desulfurization performance.