Catalytic performance of calcium titanate for catalytic decomposition of waste polypropylene to carbon nanotubes in a single-stage cvd reactor

Show simple item record Modekwe, Helen Uchenna Mamo, Messai Adenew Daramola, Michael Olawale Moothi, Kapil 2021-03-25T09:07:25Z 2021-03-25T09:07:25Z 2020-09
dc.description.abstract Calcium titanate mixed metal oxides with different contents were used as supports for NiMo catalyst prepared by the sol–gel method. The activities of these catalysts were tested in the catalytic decomposition of waste polypropylene (PP) for the synthesis of carbon nanotubes (CNTs) using a single-stage chemical vapor deposition technique. The physico-chemical properties of the catalysts and deposited carbon over the catalysts were checked by X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature-programmed reduction (TPR), N2 physisorption, transmission electron microscopy (TEM), Raman spectroscopy, and thermogravimetric analysis (TGA). The TEM and XRD results presented a high dispersion of the active metal species on the surface of the support materials. The result showed that increasing the support content led to an increased crystallite size of the catalysts and a resultant reduction in CNTs yield from 44% to 35%. NiMo-supported CaTiO3 catalyst displayed good catalytic activity and stability toward CNTs growth. Furthermore, the effect of calcination temperature on the morphology, yield, and quality of CNTs was also studied, and it was observed that thermal treatment up to 700 ◦C could produce well graphitized, high-quality, and high-yield CNTs from the waste PP. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.librarian pm2021 en_ZA
dc.description.sponsorship The University of Johannesburg, South Africa en_ZA
dc.description.uri en_ZA
dc.identifier.citation Modekwe, H.U.; Mamo, M.A.; Daramola, M.O.; Moothi, K. Catalytic Performance of Calcium Titanate for Catalytic Decomposition of Waste Polypropylene to Carbon Nanotubes in a Single-Stage CVD Reactor. Catalysts 2020, 10, 1030. en_ZA
dc.identifier.issn 2073-4344 (online)
dc.identifier.other 10.3390/catal10091030
dc.language.iso en en_ZA
dc.publisher MDPI en_ZA
dc.rights © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. en_ZA
dc.subject Calcium titanate en_ZA
dc.subject NiMo catalyst en_ZA
dc.subject Catalyst support en_ZA
dc.subject Carbon nanotubes en_ZA
dc.subject Waste polypropylene en_ZA
dc.subject Thermogravimetric analysis (TGA) en_ZA
dc.subject Raman spectroscopy en_ZA
dc.subject X-ray diffraction (XRD) en_ZA
dc.subject Scanning electron microscopy (SEM) en_ZA
dc.subject Transmission electron microscopy (TEM) en_ZA
dc.subject Temperature-programmed reduction (TPR) en_ZA
dc.subject N2 physisorption en_ZA
dc.title Catalytic performance of calcium titanate for catalytic decomposition of waste polypropylene to carbon nanotubes in a single-stage cvd reactor en_ZA
dc.type Article en_ZA

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