Banca de QUALIFICAÇÃO: ROMARIO CEZAR PEREIRA DA COSTA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ROMARIO CEZAR PEREIRA DA COSTA
DATA : 02/07/2019
HORA: 10:00
LOCAL: a definir
TÍTULO:

Synthesis and characterization of solid carriers based on Cu and Mn supported on minerals for use in chemical looping technology with CO₂ capture

PALAVRAS-CHAVES:

CO₂ capture. Chemical looping. CLC. Copper. Manganese. Diatomite. Kaolin.

PÁGINAS: 90
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Determinação de Estrutura de Compostos Inorgânicos
RESUMO:

In recent years there has been extensive research into the causes and consequences of climate change in favor of the amount of anthropogenic gases emitted into the atmosphere. One of the major causes of greenhouse effect is CO₂, which has been mostly produced from the burning of fossil fuels. In order to minimize the emissions, as well as the serious consequences caused by this gas, several researchers around the world have developed mechanisms to capture and store carbon dioxide. Conventional CO₂ capture means uses a large amount of energy for this separation, but the capture of CO₂ through the chemical looping combustion process (CLC), stands out as not having energy penalty. In view of this, this doctoral thesis aimed to synthesize and evaluate solid oxygen carriers based on copper and manganese supported on diatomite and kaolin in order to produce energy through the indirect burning of fossil fuels. The carriers were analyzed by XRD, SEM-EDS and EDX, mechanical resistance, friction tests (AJI), TPR and reactivity tests by thermogravimetry, as well as verifying the oxygen transport capacity of each material (Roc). According to the XRD results, copper (CuO) and manganese (Mn₃O₄) oxides, ie the active phases, were formed, corroborating with the results generated by TPR, which presented characteristics of materials composed of these oxides, besides evaluating the reducibility of each carrier. In general, considerable values of mechanical strength of the carriers were observed, being ideal for use in CLC. The reactivity of the samples was evaluated by means of thermogravimetry, where reduction and oxidation cycles were performed, which showed high reactivity and oxygen transport capacity of at least two of these materials. Better conversion values of H₂ and CH₄ fuels were observed for copper samples, especially Cu/diatomite. The copper-based samples excelled by having attended practically all the requirements needed to be used in chemical looping (CLC) combustion processes.

MEMBROS DA BANCA:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo ao Programa - 2302898 - ELEDIR VITOR SOBRINHO
Externa ao Programa - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS - UFRN