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Previous issue date: 2017-12-18 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Alguns res?duos, provenientes das mais variadas atividades, podem ser reaproveitados, diminuindo o efeito dos impactos ambientais ocasionados pela m? disposi??o dos mesmos no meio ambiente. Os res?duos classificados com biomassa lignocelul?sica, podem ser convertidos em produtos qu?micos e combust?veis a partir da pir?lise r?pida convencional, gerando como produto principal o bio-?leo com caracter?sticas diretamente ligadas as caracter?sticas da biomassa de origem que podem ser melhoradas a partir do uso de catalisadores. Neste trabalho foram sintetizados catalisadores do tipo ZSM-5 e HZSM-5, utilizando res?duos de p? de granito, p? de vidro, diatomita e cinza da casca do arroz como fontes alternativas e tamb?m um catalisador utilizando fonte convencional de S?lica e Alum?nio. O objetivo da s?ntese desses materiais ? utiliz?-los como catalisador na pir?lise da fibra do coco visando a obten??o de produtos com maior valor agregado, reduzindo a produ??o de compostos oxigenados. A biomassa utilizada foi caracterizada por an?lise imediata, densidade, an?lise elementar, Teor de Celulose, hemicelulose e lignina, Poder calor?fico, TG/DTG, DRX, FT-IR e FRX afim de analisar o potencial energ?tico da mesma. Os precursores de S?lica e Alum?nio foram submetidos a an?lises de FRX, DRX, e os catalisadores foram caracterizados por TG/DTG, DRX, FT-IR, MEV e BET. Nos resultados de pir?lise convencional da fibra do coco observou a grande produ??o de produtos oxigenados, a maior parte deles fen?is e nos resultados das pir?lise catal?tica foi poss?vel observar a diminui??o desses produtos, provando a efici?ncia dos catalisadores utilizados. / Some waste, from the most varied activities, can be reused, reducing the effect of these impacts, usually caused by poor disposal in the environment. The residues classified with lignocellulosic biomass can be converted into chemical products and fuels from the conventional fast pyrolysis, generating as main product the bio-oil. This generally presents some undesirable characteristics directly linked to the characteristics of the source biomass, which decrease its energy efficiency. The use of catalysts allows the reduction of these undesirable products and improves the final quality of the bio oil. As a result, ZSM-5 and HZSM-5 catalysts were synthesized using granite powder, glass powder, diatomite and rice husk ash as alternative sources of silica and aluminum; was also synthesized using a conventional silica and aluminum source, serving as a standard for the others. . The objective of the synthesis of these materials is to use them as a catalyst in the pyrolysis of coconut fiber in order to obtain products with higher added value, reducing the production of oxygenated compounds. The biomass used was characterized by immediate analysis, density, elemental analysis, cellulose content, hemicellulose and lignin, calorific power, TG / DTG, XRD, FT-IR and FRX in order to analyze the energy potential of the same. Silica and Aluminum precursors were subjected to FRX, XRD analyzes, and the catalysts were characterized by TG / DTG, DRX, FT-IR, MEV and BET. In the results of conventional pyrolysis of the coconut fiber, it was observed the great production of oxygenated products, most of them phenols and in the results of the catalytic pyrolysis it was possible to observe the decrease of these products, proving the efficiency of the catalysts used.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/25052 |
| Date | 18 December 2017 |
| Creators | Costa, Juliana Elionara Bezerra |
| Contributors | 04514998320, Costa, Cintia de Castro, 01274338484, Barros, Joana Maria de Farias, 85239658404, Rabelo Neto, Raimundo Crisostomo, 61909378372, Braga, Renata Martins, 05165674460, Melo, Marcus Antonio de Freitas |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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