Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4
Ano de defesa: | 2015 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Não Informado pela instituição
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Programa de Pós-Graduação: |
Pós-Graduação em Engenharia Química
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://ri.ufs.br/jspui/handle/riufs/17052 |
Resumo: | Due to the increase in the production of post-consumer plastic waste, the improper disposal and long-term degradation of this material, Brazil has faced serious environmental impacts. In order to avoid a worsening situation, the catalytic pyrolysis has become a very attractive process within the chemical treatment of post-consumer polymers, reducing the operating limitations of thermal pyrolysis, thus promoting processes with lower energy expenditure and selectively generating product high added value. Thus, in the present work were synthesized by hydrothermal method, a series of acids with heterogeneous catalysts mesoporous AlMCM-48 type cubic structure containing different ratios of Si/Al (50, 100, 150) for application to the pyrolysis reaction. The syntheses were performed over a period of three days with the pH between 11-13 and a highly polymerized silica source, ie, the ratio CTMABr/TEOS 0.59. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis via TG/DTG and nitrogen adsorption. Through these characterization techniques it was observed that it was possible to develop a series of catalysts with high cubic mesoporous ordering equivalent and thermally stable thermogravimetric profile, surface area and size relatively high pore volume and had agglomerated spherical morphology. The thermal and catalytic pyrolysis reactions were performed using high density polyethylene (HDPE) and polypropylene (PP), where a comparative analysis of the thermal and catalytic pyrolysis catalysts on different AlMCM-48 type was performed. Through the conversion curves it was possible to observe and compare the operating conditions to obtain a given conversion as a function of the temperature correlated with the results obtained by kinetic Isoconversional methods proposed by Flynn-Wall-Ozawa (FWO) and Vyazovkin, may analyze the influence of AlMCM-48 on the activation energy (Ea) of pyrolysis reactions. The results showed a remarkable effect of the catalyst to accelerate the process of pyrolysis. In the catalytic pyrolysis of HDPE that the catalyst was more efficiently presented the Si/Al = 50 ratio, with a yield of 77.31 %, and the PP to the most efficient catalyst was the Si/Al = 100 ratio, who presented a yield of 75.84 %. As for the kinetics, both methods have been effective isoconversão to determine Ea HDPE and PP. The method Vyazovkin exhibited lower activation energies, an average difference 87.220 kJ.mol-1 for HDPE and 111.811 kJ.mol-1 to PP compared with the FWO method. The Ea determined by both methods showed the same behavior on the dependence of conversion and Ea(HDPE) < Ea(PP). In this work, efficient kinetic results were obtained, compared to pyrolysis reactions involving the HDPE and PP over AlMCM-48 catalysts, providing a basis for the potential benefit of the chemical recycling of post-consumer polymers, potentially leading to an efficient process in terms of energy costs. |
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Santos, Tiago Gomes dosSouza, Marcelo José Barros deAraujo, Antonio Souza de2023-02-03T23:07:23Z2023-02-03T23:07:23Z2015-07-15SANTOS, Tiago Gomes dos. Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4. 2015. 86 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Sergipe, São Cristóvão, 2015.http://ri.ufs.br/jspui/handle/riufs/17052Due to the increase in the production of post-consumer plastic waste, the improper disposal and long-term degradation of this material, Brazil has faced serious environmental impacts. In order to avoid a worsening situation, the catalytic pyrolysis has become a very attractive process within the chemical treatment of post-consumer polymers, reducing the operating limitations of thermal pyrolysis, thus promoting processes with lower energy expenditure and selectively generating product high added value. Thus, in the present work were synthesized by hydrothermal method, a series of acids with heterogeneous catalysts mesoporous AlMCM-48 type cubic structure containing different ratios of Si/Al (50, 100, 150) for application to the pyrolysis reaction. The syntheses were performed over a period of three days with the pH between 11-13 and a highly polymerized silica source, ie, the ratio CTMABr/TEOS 0.59. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis via TG/DTG and nitrogen adsorption. Through these characterization techniques it was observed that it was possible to develop a series of catalysts with high cubic mesoporous ordering equivalent and thermally stable thermogravimetric profile, surface area and size relatively high pore volume and had agglomerated spherical morphology. The thermal and catalytic pyrolysis reactions were performed using high density polyethylene (HDPE) and polypropylene (PP), where a comparative analysis of the thermal and catalytic pyrolysis catalysts on different AlMCM-48 type was performed. Through the conversion curves it was possible to observe and compare the operating conditions to obtain a given conversion as a function of the temperature correlated with the results obtained by kinetic Isoconversional methods proposed by Flynn-Wall-Ozawa (FWO) and Vyazovkin, may analyze the influence of AlMCM-48 on the activation energy (Ea) of pyrolysis reactions. The results showed a remarkable effect of the catalyst to accelerate the process of pyrolysis. In the catalytic pyrolysis of HDPE that the catalyst was more efficiently presented the Si/Al = 50 ratio, with a yield of 77.31 %, and the PP to the most efficient catalyst was the Si/Al = 100 ratio, who presented a yield of 75.84 %. As for the kinetics, both methods have been effective isoconversão to determine Ea HDPE and PP. The method Vyazovkin exhibited lower activation energies, an average difference 87.220 kJ.mol-1 for HDPE and 111.811 kJ.mol-1 to PP compared with the FWO method. The Ea determined by both methods showed the same behavior on the dependence of conversion and Ea(HDPE) < Ea(PP). In this work, efficient kinetic results were obtained, compared to pyrolysis reactions involving the HDPE and PP over AlMCM-48 catalysts, providing a basis for the potential benefit of the chemical recycling of post-consumer polymers, potentially leading to an efficient process in terms of energy costs.Devido ao aumento na produção de resíduos plásticos pós-consumo, no descarte inadequado e no longo período de degradação deste material, o Brasil tem enfrentado sérios impactos ambientais. A fim de evitar uma situação de agravamento, a pirólise catalítica tornou-se um processo bastante atrativo no âmbito do tratamento químico de polímeros pós-consumo, atenuando as limitações operacionais da pirólise térmica, promovendo assim processos com menores gastos energéticos e gerando seletivamente produtos de alto valor agregado. Assim, no presente trabalho de pesquisa foram sintetizados, pelo método hidrotérmico, uma série de catalisadores heterogêneos mesoporosos ácidos com estrutura cúbica tipo AlMCM-48 contendo diferentes razões de Si/Al (50, 100, 150) para aplicação na reação de pirólise. As sínteses foram realizadas durante um período de três dias com o pH entre 11-13 e uma fonte de sílica altamente polimerizada, ou seja, a razão CTMABr/TEOS de 0,59. Os catalisadores obtidos foram caracterizados por difração de raios-X (DRX), microscopia eletrônica de varredura (MEV), análise térmica via TG/DTG e adsorção de nitrogênio. Através destas técnicas de caracterização observou-se que foi possível desenvolver uma série de catalisadores com alto grau de ordenação cúbica mesoporosa, perfil termogravimétrico equivalente e termicamente estável, tamanhos de área superficial e volume de poros relativamente altos e apresentaram morfologia esférica e aglomerada. As reações de pirólise térmica e catalítica foram realizadas utilizando polietileno de alta densidade (PEAD) e polipropileno (PP), onde uma análise comparativa da pirólise térmica e catalítica sobre os diferentes catalisadores tipo AlMCM-48 foi realizada. Através das curvas de conversão foi possível observar e comparar as condições operacionais para se obter uma determinada conversão em função da temperatura, sendo os resultados obtidos correlacionados pelos métodos cinéticos de isoconversão propostos por Flynn-Wall-Ozawa (FWO) e Vyazovkin, podendo-se analisar a influência do AlMCM-48 na energia de ativação (Ea) das reações de pirólise. Os resultados obtidos mostraram um efeito notável do catalisador para acelerar os processos da pirólise. Na pirólise catalítica do PEAD o catalisador que apresentou mais eficiência foi o de razão Si/Al = 50, com um rendimento de 77,31 %, e quanto ao PP o catalisador mais eficiente foi o de razão Si/Al = 100, que apresentou um rendimento de 75,84 %. Quanto ao comportamento cinético, ambos os métodos de isoconversão se mostraram eficientes para determinar as Ea do PEAD e do PP. O método de Vyazovkin exibiu energias de ativação mais baixas, numa diferença média de 87,220 kJ.mol -1 para o PEAD e 111,811 kJ.mol1 para o PP, quando comparado com o método de FWO. As Ea determinadas por ambos os métodos mostraram o mesmo comportamento sobre a dependência da conversão e Ea(PEAD) < Ea(PP). Neste trabalho, foram obtidos resultados cinéticos eficientes, frente às reações de pirólise que envolveram o PEAD e o PP sobre os catalisadores AlMCM-48, fornecendo uma base para o benefício potencial da reciclagem química de polímeros pós-consumo, levando potencialmente a um processo eficaz, em termos de gastos de energia.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqSão CristóvãoporEngenharia químicaProcessos químicosPirólisePolímerosCatalisadoresSíntese hidrotérmicaAlMCM-48Polímeros pós-consumoPirólise catalíticaMétodos de isoconversãoHydrothermal synthesisPost-consumer polymersCatalytic pyrolysisIsoconversional methodsENGENHARIAS::ENGENHARIA QUIMICAPirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4Pyrolysis thermal and catalytic of post-consumer polymer over catalysts type AlMCM-48info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em Engenharia QuímicaUniversidade Federal de Sergipereponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/17052/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALTIAGO_GOMES_SANTOS.pdfTIAGO_GOMES_SANTOS.pdfapplication/pdf6773655https://ri.ufs.br/jspui/bitstream/riufs/17052/2/TIAGO_GOMES_SANTOS.pdfab69db9ddacc24fa729b4254b8e1e07cMD52TEXTTIAGO_GOMES_SANTOS.pdf.txtTIAGO_GOMES_SANTOS.pdf.txtExtracted texttext/plain145366https://ri.ufs.br/jspui/bitstream/riufs/17052/3/TIAGO_GOMES_SANTOS.pdf.txt2eb3f12f8951af522a272ded36ba4592MD53THUMBNAILTIAGO_GOMES_SANTOS.pdf.jpgTIAGO_GOMES_SANTOS.pdf.jpgGenerated Thumbnailimage/jpeg1232https://ri.ufs.br/jspui/bitstream/riufs/17052/4/TIAGO_GOMES_SANTOS.pdf.jpg8c9951784e6bbdf0fc82ac1e839467e8MD54riufs/170522023-02-03 20:07:23.308oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2023-02-03T23:07:23Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
dc.title.alternative.eng.fl_str_mv |
Pyrolysis thermal and catalytic of post-consumer polymer over catalysts type AlMCM-48 |
title |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
spellingShingle |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 Santos, Tiago Gomes dos Engenharia química Processos químicos Pirólise Polímeros Catalisadores Síntese hidrotérmica AlMCM-48 Polímeros pós-consumo Pirólise catalítica Métodos de isoconversão Hydrothermal synthesis Post-consumer polymers Catalytic pyrolysis Isoconversional methods ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
title_full |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
title_fullStr |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
title_full_unstemmed |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
title_sort |
Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4 |
author |
Santos, Tiago Gomes dos |
author_facet |
Santos, Tiago Gomes dos |
author_role |
author |
dc.contributor.author.fl_str_mv |
Santos, Tiago Gomes dos |
dc.contributor.advisor1.fl_str_mv |
Souza, Marcelo José Barros de |
dc.contributor.advisor-co1.fl_str_mv |
Araujo, Antonio Souza de |
contributor_str_mv |
Souza, Marcelo José Barros de Araujo, Antonio Souza de |
dc.subject.por.fl_str_mv |
Engenharia química Processos químicos Pirólise Polímeros Catalisadores Síntese hidrotérmica AlMCM-48 Polímeros pós-consumo Pirólise catalítica Métodos de isoconversão |
topic |
Engenharia química Processos químicos Pirólise Polímeros Catalisadores Síntese hidrotérmica AlMCM-48 Polímeros pós-consumo Pirólise catalítica Métodos de isoconversão Hydrothermal synthesis Post-consumer polymers Catalytic pyrolysis Isoconversional methods ENGENHARIAS::ENGENHARIA QUIMICA |
dc.subject.eng.fl_str_mv |
Hydrothermal synthesis Post-consumer polymers Catalytic pyrolysis Isoconversional methods |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA QUIMICA |
description |
Due to the increase in the production of post-consumer plastic waste, the improper disposal and long-term degradation of this material, Brazil has faced serious environmental impacts. In order to avoid a worsening situation, the catalytic pyrolysis has become a very attractive process within the chemical treatment of post-consumer polymers, reducing the operating limitations of thermal pyrolysis, thus promoting processes with lower energy expenditure and selectively generating product high added value. Thus, in the present work were synthesized by hydrothermal method, a series of acids with heterogeneous catalysts mesoporous AlMCM-48 type cubic structure containing different ratios of Si/Al (50, 100, 150) for application to the pyrolysis reaction. The syntheses were performed over a period of three days with the pH between 11-13 and a highly polymerized silica source, ie, the ratio CTMABr/TEOS 0.59. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis via TG/DTG and nitrogen adsorption. Through these characterization techniques it was observed that it was possible to develop a series of catalysts with high cubic mesoporous ordering equivalent and thermally stable thermogravimetric profile, surface area and size relatively high pore volume and had agglomerated spherical morphology. The thermal and catalytic pyrolysis reactions were performed using high density polyethylene (HDPE) and polypropylene (PP), where a comparative analysis of the thermal and catalytic pyrolysis catalysts on different AlMCM-48 type was performed. Through the conversion curves it was possible to observe and compare the operating conditions to obtain a given conversion as a function of the temperature correlated with the results obtained by kinetic Isoconversional methods proposed by Flynn-Wall-Ozawa (FWO) and Vyazovkin, may analyze the influence of AlMCM-48 on the activation energy (Ea) of pyrolysis reactions. The results showed a remarkable effect of the catalyst to accelerate the process of pyrolysis. In the catalytic pyrolysis of HDPE that the catalyst was more efficiently presented the Si/Al = 50 ratio, with a yield of 77.31 %, and the PP to the most efficient catalyst was the Si/Al = 100 ratio, who presented a yield of 75.84 %. As for the kinetics, both methods have been effective isoconversão to determine Ea HDPE and PP. The method Vyazovkin exhibited lower activation energies, an average difference 87.220 kJ.mol-1 for HDPE and 111.811 kJ.mol-1 to PP compared with the FWO method. The Ea determined by both methods showed the same behavior on the dependence of conversion and Ea(HDPE) < Ea(PP). In this work, efficient kinetic results were obtained, compared to pyrolysis reactions involving the HDPE and PP over AlMCM-48 catalysts, providing a basis for the potential benefit of the chemical recycling of post-consumer polymers, potentially leading to an efficient process in terms of energy costs. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015-07-15 |
dc.date.accessioned.fl_str_mv |
2023-02-03T23:07:23Z |
dc.date.available.fl_str_mv |
2023-02-03T23:07:23Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, Tiago Gomes dos. Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4. 2015. 86 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Sergipe, São Cristóvão, 2015. |
dc.identifier.uri.fl_str_mv |
http://ri.ufs.br/jspui/handle/riufs/17052 |
identifier_str_mv |
SANTOS, Tiago Gomes dos. Pirólise térmica e catalítica de polímeros pós-consumo sobre catalisadores tipo AIMCM-4. 2015. 86 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Sergipe, São Cristóvão, 2015. |
url |
http://ri.ufs.br/jspui/handle/riufs/17052 |
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por |
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Pós-Graduação em Engenharia Química |
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Universidade Federal de Sergipe |
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