Experimental study on microreactor-based CNTs catalysts: Preparation and application

摘要

Catalysts are essential for the preparation of carbon nanotubes. In this work, Fe-Mo/Al2O3 catalysts prepared by using microreactor with precise control and rapid mixing of microfluids. Here the catalysts were applied to the synthesis of CNTs and to the low temperature reduction. The catalysts and CNTs were characterized by SEM, TEM, H-2-TPR and Raman. The results showed that efficient mixing of microreactor can strengthen the interaction between metal and support, improved the stability of catalysts, making that it was difficult to deactivate at high temperature. The catalysts prepared by microreactor had more active sites, which improved the catalytic performance, and had higher C3H6 conversion. Compared with the catalysts prepared by traditional reactions, the surface morphology of the catalysts prepared by microreactor was folded and the active component had better dispersion. Except that, the microreactor strengthened the uniformity of precipitation components distribution during co-precipitation, enhanced the interaction between active components and carriers, and improved the mechanical strength of catalysts. After reduction, the specific surface area of the catalyst was significantly reduced and the particles further coalesced. Different reduction temperature (low temperature) can affect the catalytic activity and graphitization degree of CNTs. The catalytic activity of the catalyst calcined at 450 degrees C and reduced at 600 degrees C can reach 74.76%, and it exhibited better graphitization degree.