Summary
A set of Fe-Mo-Mg catalysts with various Mo/Mg weight ratios (40/10, 30/20, 20/30, and 10/40) had been ready and evaluated for the synthesis of graphene nanosheets/carbon nanotubes (GNS/CNT) hybrid supplies by way of methane chemical vapor deposition. The outcomes confirmed that altering the Mo/Mg ratio had a major influence on the yield and the character of the deposited carbon. The XRD and TPR outcomes revealed that the iron molybdate and magnesioferrite species had been the primary elements of Fe-Mo-Mg catalysts. TEM photos confirmed that GNS-CNT hybrid supplies had been efficiently grown on the floor of all Fe-Mo-Mg programs, apart from the catalyst with the Mo/Mg ratio of 10:40, which produced CNT solely. Raman spectroscopy outcomes revealed that each one carbon merchandise had been of top of the range, with ID/IG ratios starting from 0.14 − 0.41. It was additionally observed that growing the MgO content material within the catalyst composition will increase the quantity of CNT in comparison with GNS. The full carbon yield elevated from 170% to 284% for Fe-40Mo-10Mg and Fe-10Mo-40Mg, respectively. The gradual incorporation of Mg into the Fe-Mo catalyst considerably elevated catalytic development exercise as a result of presence of quite a few blended oxide species with various constructions, reminiscent of MgFeOx, MgMoOx, and FeMoOx.
