Banca de QUALIFICAÇÃO: TOMAZ RODRIGUES DE ARAÚJO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : TOMAZ RODRIGUES DE ARAÚJO
DATA : 20/12/2018
HORA: 15:00
LOCAL: Auditório do LABTAM - NUPPRAR
TÍTULO:

NICKEL-BASED CATALYSTS SUPPORTED ON CEXAL2-XO3 PEROVSKITES SYNTHESIZED BY THE ONE-STEP METHOD BY MIDDLE MICROWAVE ASSISTED COMBUSTION FOR DRY METHANE REFORM

PALAVRAS-CHAVES:

Perovskites, CexAl2-xO3, one-step, dry methane reform, self-combustion and microwave

PÁGINAS: 95
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

Cerium aluminate is a perovskite (AmBnO3) which has catalytic properties still poorly studied, especially when synthesized by microwave assisted self-combustion. In this context, the objective of this work was to produce aluminate aluminates, one-step, via microwave assisted combustion using a single fuel (urea, 250% excess), and to apply them as a support in the dry reforming of methane. The variation of the content (mol) of cerium was: 0.25; 0.50; 0.75 and 1; post-synthesized the supports were impregnated with 10% nickel in mass, and then calcined at 500 ° C for 3h by heating them to 10 ° C / min. The X-ray diffraction, scanning electronics microscopy, thermogravimetric analysis, specific surface area (BET-BJH), helium gas density, programmed temperature reduction and spectrophotometry in the ultraviolet and visible region were the techniques used in characterizations. The results show that there was aluminate formation in the synthesis with a reflectance band (380 nm), density (5.0636 to 5.9639 g / cm³), surface area (20.435 to 24.741 m²g-1) and morphology consistent with the literature and with conversions above of 60% for CO2 and the CH4, same though there was coke formation with of nanotube morphology, however, there was no deactivation of the catalysts after 20 h of reaction. These results shows if relevants, once the work produced single-stage perovskites Ce1Al1O3 with stable crystalline structure and promising catalytic performance for the syngas gas industry, besides optimize the manufacturing process of these catalysts with the elimination of the calcination step of the support.

MEMBROS DA BANCA:
Interno - 349770 - DULCE MARIA DE ARAUJO MELO
Presidente - 6347420 - MARCUS ANTONIO DE FREITAS MELO
Externo ao Programa - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - ÂNGELO ANDERSON SILVA DE OLIVEIRA - UFRN