Effect of Different Catalyst Supports on the Quality, Yield and Morphology of Carbon Nanotubes Produced from Waste Polypropylene Plastics

The role of the effect support on reactivity heterogeneous catalysts cannot be over-emphasized. Therefore, study documented in this article investigated different metal oxide supports (MgO, CaO and TiO2) mixed (CaTiO3) performance a bimetallic NiMo catalyst prepared via sol–gel method during catalytic growth carbon nanotubes (CNTs) from waste polypropylene (PP). Waste PP was pyrolyzed at 700 °C single-stage chemical vapor deposition reactor off-gas utilized in-situ as cheap feedstock for CNTs under similar conditions all (supported unsupported). structures deposited were extensively characterized using X-ray diffraction (XRD), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), etc. supported unsupported evaluated terms yield, purity, morphology synthesized CNTs. results revealed that stabilizing is fundamental preventing nanoparticle agglomeration aggregation, thereby resulting improved yield quality Supported produced better aligned graphitic high-quality NiMo/CaTiO3 highest 40.0%, while low-quality with lowest 18.4%. type overall stability materials play significant roles PP.