Banca de DEFESA: ELLEN KADJA LIMA DE MORAIS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ELLEN KADJA LIMA DE MORAIS
DATA : 23/11/2018
HORA: 09:00
LOCAL: Auditório do CCET/UFRN
TÍTULO:

CATALYTIC CO-PYROLYSIS OF PLASTIC WASTE AND EUCALYPT BIOMASS FOR OBTAINING ALTERNATIVE FUELS

PALAVRAS-CHAVES:

Co-pyrolysis; Beta Zeolite; Plastic polyolefins; Lignocellulosic biomass.

PÁGINAS: 107
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Research on sustainable energy sources has encouraged alternative conversion processes. Based on this context, the present work reports the co-pyrolysis of the mixture of lignocellulosic biomass (eucalyptus wood chips) and low density polyethylene (LDPE) using Beta zeolite as a catalyst. The Beta samples employed have different Si / Al ratios (18 and 80) and are formed by aggregates of nanocrystals, which gives them significant mesopore / outer surface area and, therefore, with appropriate accessibility for the conversion of voluminous molecules. The reactions were performed in a two-stage system (thermal / catalytic), operating at 550 and 500 ° C, respectively. All the fractions produced (coal, coke, bio-oil and gases) were quantified and characterized by standardized analytical techniques - for the solid products (coal and coke) thermogravimetry and elemental analysis (CHNS-O) were used - while the product (bio-oil) was analyzed by Karl Fischer, CHNS-O and Gas Chromatography / Mass Spectrum and, finally, the gaseous product monitored by the Gas Chromatograph. The evolution of the product distribution with the variation of the ratio catalyst / blend of biomass and polyethylene (C / M) was investigated. A maximum organic fraction yield (bio-oil) was observed for both samples at the intermediate C / M ratios, ie with 1.6 and 2.0 g of catalyst, due to the conversion of the wax, consisting mainly of linear hydrocarbons produced by cracking of LDPE, on the acid sites of the zeolite. The yield corresponding to this maximum was higher for the Beta sample with higher acidity (Si / Al = 18). The cracking of the wax fraction was accompanied by a significant reduction in the oxygen content of the bio-oil, which markedly improved its fuel properties, indicating that positive synergistic effects occur during the co-pyrolysis of the mixture of lignocellulosic biomass and polyolefin plastics. Finally, it was observed that for the high C / M ratios, relative to 3.0 g of catalyst, the main components of the bio-oil fraction were aliphatic and aromatic hydrocarbons from wax cracking, oligomerization / cyclization / aromatization of light olefins and Diels-Alder condensation between furans and light olefins. These results confirm the potential use of co-pyrolysis by using zeolite Beta that efficiently catalyzes the conversion of the blend (biomass / polyethylene) to low molecular weight hydrocarbons, reaching a high degree of deoxygenation.

MEMBROS DA BANCA:
Interno - 2140818 - AMANDA DUARTE GONDIM
Externo à Instituição - ANA CATARINA FERNANDES CORIOLANO - UnP
Presidente - 350509 - ANTONIO SOUZA DE ARAUJO
Externo à Instituição - RENATA MARTINS BRAGA - UFRN
Externo à Instituição - VINÍCIUS PATRÍCIO DA SILVA CALDEIRA - UERN