Banca de DEFESA: TOMAZ RODRIGUES DE ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : TOMAZ RODRIGUES DE ARAÚJO
DATA : 15/03/2019
HORA: 15:00
LOCAL: Auditório do LABTAM - NUPPRAR
TÍTULO:

NICKEL-BASED CATALYSTS SUPPORTED ON PEROVSKITES IN CÉRIO (CexAl2-xO3) FOR THE DRY METHANE REFORM

PALAVRAS-CHAVES:

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

PÁGINAS: 115
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

Cerium aluminate is a perovskite of the type AmBnO3 what has catalytic properties little studied when synthesized by microwave assisted autocombustion. In this context, the objective of this work was to produce cerium aluminates in one-step microwave assisted combustion using a single fuel (urea, 250% excess) and apply them as a support in the dry reforming of methane. The variation of the cerium content was: 0.25; 0.50; 0.75 and 1 mol; after the synthesis the supports were impregnated with 10% nickel by mass, and then calcined at 500 °C for 3 h by heating them to 10 °C.min-1 . The X-ray diffraction, scanning electron microscopy (MEV-EDS), thermogravimetric analysis, specific surface area (BET-BJH), helium gas density, MEV-FEG, programmed temperature reduction, in-situ X-ray diffraction (XPD) and absorption spectroscopy in the ultraviolet and visible region were the techniques used in the characterizations. The results show that the formation of the aluminate in the synthesis with reflectance band (380 nm), density (5.06 to 5.96 g.cm- ³), specific area (20.44 to 24.74 m².g-1 ), heterogeneous morphology expressed by diverse surface and rugged reliefs, in addition to conversions above 60% for CO2 and CH4, even though there was coke formation with 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:
Externo ao Programa - 2302898 - ELEDIR VITOR SOBRINHO
Presidente - 6347420 - MARCUS ANTONIO DE FREITAS MELO
Externa ao Programa - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS - UFRN
Externo à Instituição - RODRIGO CÉSAR SANTIAGO - UFERSA