Banca de DEFESA: ROMARIO CEZAR PEREIRA DA COSTA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ROMARIO CEZAR PEREIRA DA COSTA
DATE: 20/12/2019
TIME: 15:00
LOCAL: Auditório do NUPPRAR
TITLE:

MINERAL-SUPPORTED SOLID Cu AND Mn-BASED OXYGEN CARRIERS FOR USE IN CHEMICAL LOOPING COMBUSTION TECHNOLOGY WITH CO₂-CAPTURE

KEY WORDS:

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

PAGES: 125
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Físico Química Inorgânica
SUMMARY:

Energy systems with carbon dioxide capture and storage have been shown to be an alternative to minimize greenhouse gas emissions. The capture of CO₂ by combustion by chemical recirculation, from Chemical Looping Combustion (CLC), stands out for not having energy penalty, but the cost and efficiency of the process depend on the materials used as oxygen carriers. In view of this, this work aims to synthesize and evaluate solid copper and manganese oxygen carriers supported on diatomite and kaolin in order to produce energy through indirect burning of fossil fuels through the CLC process. The carriers were synthesized by the incipient wet impregnation technique and characterized by X-ray diffraction, scanning electron microscopy equipped with an X-ray dispersive energy analyzer, mechanical resistance, air jet index, reduction at programmed temperature and reactivity tests by thermogravimetry. It was also verified, by temogravimetry, the oxygen transport capacity of each sample (R_oc). X-ray diffraction analysis detected the presence of characteristic peaks of the active phases (CuO, Mn₃O₄ and Mn₇SiO₁₂), which were also confirmed by programmed temperature reduction tests. The mechanical resistance of conveyor particles below 1N is unviable in CLC beds. ¾ of the materials studied in this work obtained mechanical strength higher than 2N. The reactivity of the samples was evaluated by thermogravimetry, where three reduction and oxidation cycles were performed. In this analysis it was observed that CuO supported in diatomite (Cu-D) stood out in relation to the others, due to its high reactivity and oxygen transport capacity. This material obtained a conversion percentage of H₂ above 95%, followed by kaolin supported CuO (~ 90%). Manganese-based materials showed good H₂ and CH₄ conversion results (above 90%), but were not efficient in oxidation, losing reactivity at each cycle. The copper-based samples are promising, as they obtained mechanical resistance above 2N, high oxygen transport capacity and fuel conversion efficiency, with values above 95%.

BANKING MEMBERS:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Interna - 1805556 - LUCIENE DA SILVA SANTOS
Externa ao Programa - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - RODRIGO CÉSAR SANTIAGO - UFERSA
Externo à Instituição - TIAGO ROBERTO DA COSTA - IFRN