Banca de DEFESA: JESSICA MARIA OLÍVIA DE MELO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JESSICA MARIA OLÍVIA DE MELO
DATE: 29/09/2022
TIME: 14:00
LOCAL: https://meet.google.com/qxn-jfpz-qiy
TITLE:

Synthesis and characterization of Co-Mo/HDL composites for catalysis of the H2 production reaction from borohydride hydrolysis

KEY WORDS:

Production of H2, Green energy, LDH, Co-Mo.

PAGES: 73
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Balanços Globais de Matéria e Energia
SUMMARY:

Molecular hydrogen (H2) has currently been the subject of many studies because it is a promising alternative as an energy vector for renewable energy sources. Considering the need to use catalysts for the generation of H2, several studies have been developed aiming at more efficiency. In this study, double lamellar hydroxides (HDL) were chosen as support, due to their stability and viability, and as catalyst the mixture of cobalt and zero-valent molybdenum. The efficiency of HDL with Co0 and Mo0 (by two routes) as a catalyst for the NaBH4 hydrolysis reaction was evaluated by the rate of hydrogen generated. Co-Mo/HDL was synthesized by the co-precipitation method. The morphology and structure of the materials were investigated by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS) and Scanning Electron Microscopy (SEM) which prove the achievement of two catalysts different both morphologically and structurally and in catalytic activity. As expected, the reaction rate increases along with the temperature for the two catalysts, obtaining Ea = 20.86 kJ/mol for catalyst 1 and Ea = 25.90 kJ/mol for catalyst 2, indicating excellent performance catalysts. catalytic. The hydrogen generation rates were up to 1067 mL/min g for catalyst 1 and up to 1515 mL/min g for catalyst 2. The characterizations helped to reveal the difference in catalytic activity between the catalysts, evidencing the different positions and ways of how Co-Mo docked in the HDL support. Both catalysts showed high performance, with better performance of catalyst 2, which kept Co-Mo more external and with exposed sites in its structure, thus facilitating catalytic activity. Such conclusions indicate the possibility of using these catalysts to generate H2 in a competitive way in relation to other catalysts present in the literature.

BANKING MEMBERS:
Presidente - 1314677 - CARMEM LUCIA DE PAIVA E SILVA ZANTA
Interna - 1515173 - SIMONI MARGARETI PLENTZ MENEGHETTI
Externo ao Programa - 3252578 - JOSÉ LEANDRO DA SILVA DUARTE
Externo ao Programa - 3182288 - VANDERSON BARBOSA BERNARDO