Banca de DEFESA: ANA CLAUDIA BEZERRA DE QUEIROZ
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : ANA CLAUDIA BEZERRA DE QUEIROZ
DATA : 30/05/2025
HORA: 08:00
LOCAL: Sala de vídeoconferência
TÍTULO:
CATALYTIC THERMODEGRADATION OF COCONUT SHELL BIOMASS PRE-TREATED WITH Mgx-ZnyO IN BETA ZEOLITE
PALAVRAS-CHAVES:
Acetylation; acid leaching; Mechanochemistry.
PÁGINAS: 66
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:
Concern about non-renewable energy sources drives the search for alternative sources, such as coconut shell biomass, which stands out as a renewable, residual carbon source, with low cost and high availability. In view of this, technology has been sought to promote the generation of energy from the use of biomass, such as biomass pre-treatment processes and the development of catalysts for use in catalytic pyrolysis. From this perspective, this work reported the development of a catalyst composed of Beta zeolite and magnesium and zinc bimetallic oxide impregnated by excess solvent and mechanochemistry. Furthermore, acid leaching and biomass acetylation pre-treatment methods were carried out, with the expectation that these could promote improvements when applied to catalytic pyrolysis of coconut shells. The oxide obtained is composed of a mixture of phases, Mg0.1O1Zn0.9, MgO and, mainly, ZnO, consisting of the agglomeration of smaller particles, with a homogeneous dispersion of Mg and Zn. Mechanochemical and excess solvent impregnation were efficient in inserting the oxide into the zeolite. Furthermore, mechanochemical impregnation in 5 and 10 min increased the external area and possibly promoted the generation of intercrystalline porosity due to the reduction in particle size. After 30 min the structure was possibly disorganized. Acetylation changed the functional groups and composition of the biomass. Acid leaching pretreatment removed impurities, reduced moisture and facilitated complete biomass degradation up to 800 °C, without residue. Acetylation degraded lignin more at lower temperatures. Therefore, the strategies presented show promising potential to improve the conversion of coconut shell biomass into alternative energy resources to fossil fuels.
MEMBROS DA BANCA:
Externo à Instituição - ADONAY RODRIGUES LOIOLA - UFC
Interno - 13136 - LEANDRO BEZERRA DE LIMA
Externa à Instituição - LINDIANE BIESEKI - UFRN
Presidente - 12281 - VINICIUS PATRICIO SANTOS CALDEIRA