Summary
A set of Fe-Mo-Mg catalysts with various Mo/Mg weight ratios (40/10, 30/20, 20/30, and 10/40) have 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 impression on the yield and the character of the deposited carbon. The XRD and TPR outcomes revealed that the iron molybdate and magnesioferrite species have been the primary elements of Fe-Mo-Mg catalysts. TEM pictures confirmed that GNS-CNT hybrid supplies have been efficiently grown on the floor of all Fe-Mo-Mg methods, 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 have been of top quality, with ID/IG ratios starting from 0.14 − 0.41. It was additionally seen that rising the MgO content material within the catalyst composition will increase the quantity of CNT in comparison with GNS. The entire 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 because of the presence of quite a few combined oxide species with various buildings, similar to MgFeOx, MgMoOx, and FeMoOx.
