Banca de QUALIFICAÇÃO: PEDRO PAULO LINHARES FERREIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : PEDRO PAULO LINHARES FERREIRA
DATE: 27/05/2021
TIME: 09:00
LOCAL: Sala virtual (videoconferência)
TITLE:

Synthesis and structural evaluation of carbon nanotubes via Ni / MgAl2O4 catalysts doped with Mn by green synthesis

KEY WORDS:

carbon nanotubes, catalyst, nanotechnology

PAGES: 150
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

Carbon nanotechnology has been attracting a lot of interest in scientific communities, especially in recent decades. This is due to the desire to achieve the desired control at the atomic and molecular level of carbon. This effort comes from the quality of its mechanical and electrical properties of great relevance, which gain prominence for the synthesis of different materials that flow into different fields such as nanomedicine, energy storage, environment and sensors. However, this promising material is sometimes not economically viable. This work aims to search for more viable alternatives to this reality, looking for a low cost option for the synthesis of carbon nanotubes (CNT). The research also aims to characterize and evaluate carbon nanotubes synthesized from Ni / MgAl2O4 catalysts doped with Mn. For this purpose, the catalyst supports were synthesized via microwave combustion, achieving two routes, the first of which was used only; and the second using aloe vera as a chelating agent. Both pathways had the purpose of doping Mn2 + ions at MgAl2O4 sites A and B, for the evaluation of their characteristics as a support. Then, the synthesized material was subjected to calcination at 900 ° C for 3 hours. The supports were then, via wet impregnation, impregnated with 50% nickel and, once again, subjected to heat treatment (550 ° C / 3h). The formed catalyst was subjected to a catalytic unit for activation and formation of carbon nanotubes. The material formed was analyzed using Raman spectroscopy, scanning electron microscopy (SEM) and thermogravimetry (TG). The supports were also analyzed by X-ray diffractometry (XRD) and ultraviolet (UV-Vis). Previous results showed that the synthesis route used for the promotion of supports and catalysts, is efficient in the production of carbon nanotubes.

BANKING MEMBERS:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo à Instituição - GILVAN PEREIRA DE FIGUEREDO - IFMA
Externo à Instituição - RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS - UFRN