Abstract
Vanadium incorporated MCM-41 molecular sieves with various Si/V ratios (25, 50, 75 and 100) were synthesized hydrothermally and their mesoporous structure were confirmed by various physicochemical techniques such as XRD, N2 sorption studies and DRs UV–vis Spectroscopy. The catalytic activity of these molecular sieves was tested for the production of carbon nanotubes (CNTs) through acetylene decomposition at atmospheric pressure utilising catalytic chemical vapour deposition (CCVD) technique. In order to achieve the high carbon yield, the decomposition of hydrocarbon was carried out at different temperatures ranging from 650 to 850 °C. The effect of other reaction parameters like flow rate of hydrocarbon and V-MCM-41 with various Si/V ratio are also investigated. Using our optimised conditions for the system, the CNTs were selectively synthesised with a less amount of amorphous carbon, which were then purified and characterised by TGA, SEM, TEM and Raman spectroscopy.
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