Banca de QUALIFICAÇÃO: JESSICA MARIA OLÍVIA DE MELO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JESSICA MARIA OLÍVIA DE MELO
DATE: 07/04/2022
TIME: 14:00
LOCAL: Sala do PPGEQ
TITLE:

Síntese e caracterização de compósitos Co-Mo/HDL para catálise da reação de produção de H2 a partir da hidrólise de borohidreto

KEY WORDS:

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

PAGES: 54
BIG AREA: Engenharias
AREA: Engenharia Química
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. Among the technologies, one of the most viable and stable catalyst supports is Double Lamellar Hydroxide (HDL). The study catalyst is a mixture of zero-valent cobalt and
molybdenum. In this work, the efficiency of HDL doped with Co0 and Mo0 (by two routes) as a catalyst of the NaBH4 hydrolysis reaction for the generation of hydrogen was evaluated. In this study, HDL/Co-Mo was synthesized by the co-precipitation method. The materials were characterized by X-Ray Diffraction (XRD) and it was proven to obtain two different catalysts, crystalline catalyst 1 and amorphous catalyst 2. It was analyzed that increasing NaBH4 concentrations did not make hydrolysis more efficient. In a study of the effect of NaBH4 concentration, a reaction order equal to 0.405 was obtained for the range (0.1 M – 0.8 M) of NaBH4. The shortest reaction time for catalyst 1 was 7.59 minutes and for catalyst 2 it was 4.0 minutes, both for a concentration of 0.4 M NaBH4. In studies varying the concentrations of NaOH, it was observed that, at higher
concentrations, the hydrolysis reaction occurs faster and the reaction order in the range of (0.05 M-0.4 M) of NaOH is 0.295 for the catalyst 1 and 0.578 for catalyst 2. The shortest reaction time for catalyst 1 was 5.32 minutes and for catalyst 2 it was 3.20 minutes, both for the concentration of 0.4 M NaOH. In studies varying the dosage of catalysts, it was observed that at higher dosages the production of H2 occurs faster. order of 0.384 for catalyst 1 and order of 1.50 for catalyst in the range (0.05g - 0.4g) of HDL/Co-Mo. The shortest reaction time for catalyst 1 was 1.32 minutes and for catalyst 2 it was 0.46 minutes, both for the dosage of 0.4 g of catalyst. Comparing the two catalysts, the catalyst obtained by the method 2 proved to be more efficient.

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