Carbon nanotubes (CNTs) catalysts were prepared by coprecipitation method.The effects of preparation methods on the microstructure of catalysts and the CNTs morphology and diameter were investigated.Combining with the advantages of uniform mixing and fast reaction in microreactor,it replaced the traditional titration equipment as the reaction equipment,and subsequently placed the prepared catalysts in the fluidized bed for the CNTs growth.The catalysts and CNTs were characterized by BET test,scanning electron microscopy (SEM),transmission electron microscopy (TEM),temperature programmed reduction (H2-TPR) and raman spectra.The experimental results were compared with the traditional preparation results.The results shown that the traditional titration reaction had obvious agglomeration and different particle sizes due to the factors such as uneven mixing and imprecise control.The orderliness of CNTs was relatively low and the diameter span of tubes was large,mainly in the range of 10～18nm.The fluidity reaction of microfluids in the microreactor ensured the synchronization and uniformity of Fe-Al plasma precipitation.The catalysts prepared by microreactor had large specific surface area,folded surface morphology and strong interaction between Fe and Al components.CNTs grown by the catalysts had high graphitization degree,low defect density and small diameter distribution span,mainly concentrated in 11～15nm.
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