Desenvolvimento de catalisadores à base de materiais carbonosos derivados do coco verde e sua aplicação no beneficiamento de bio-óleo

• Ano de defesa: 2022
• Autor(a) principal: Arantes, Heryson Tresmann Lopes de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Química; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Química
• Palavras-chave em Português: Resíduo de poliestireno; Pericarpo de coco verde; Pirólise intermediária; Pirólise catalítica; Biocarvão ativado; subject.br-rjbn; Química
• Link de acesso: http://repositorio.ufes.br/handle/10/16254

Biocarvão based catalysts and waste polystyrene were employed to study their effect on both yield and composition of bio-oil from intermediate pyrolysis of green coconut (Cocos nucifera L.) pericarp through catalytic co-pyrolysis. Biocarvão from intermediate pyrolysis was directly employed as a catalyst, but steam activated biocarvãos with different activation time from single step activation were also studied as a low-cost catalyst. These materials are known to contain alkali and alkaline earth metals that can promote different types of reactions like demethoxylation, deoxygenation, cracking and polymerization reactions, which ultimately can lead to improved bio-oil composition. Properties of the catalysts were characterized by N2 physisorption, SEM, SEM-EDS, XRD, and ATR-FTIR techniques. Results from pyrolysis assays confirmed that co-processing biomass and plastic (waste polystyrene) can lead to higher yield of bio-oil, while greatly shifting product composition towards less oxygenated compounds. Catalytic co-pyrolysis with the low-cost catalysts confirmed that it is possible to attain high yield of monoaromatics without relying on zeolite catalysts. This effect was attributed to a synergetic effect between waste polystyrene and activated biocarvão, which ultimately resulted in a bio-oil organic fraction containing up to 60 % of xylene in its composition, while also increasing HHV from 18.65 to 34.11 MJ kg-1.