DESSULFURIZAÇÃO ADSORTIVA DE DIBENZOTIOFENO UTILIZANDO CARVÃO ATIVADO DE CASCA DE COCO DE DENDÊ IMPREGNADO COM ALUMÍNIO: ESTUDO DE EQUILÍBRIO E CINÉTICA

Autores

DOI:

https://doi.org/10.66104/mzkh2e26

Palavras-chave:

dessulfurização adsortiva; dibenzotiofeno; carvão ativado; isoterma de adsorção; cinética de adsorção

Resumo

A presença de compostos sulfurados em combustíveis derivados do petróleo representa um importante problema ambiental e tecnológico, devido à formação de SO₂ durante a combustão e à desativação de catalisadores nos processos de refino. Nesse contexto, a dessulfurização adsortiva tem sido investigada como alternativa complementar à hidrodessulfurização convencional. O presente trabalho avaliou a remoção de dibenzotiofeno (DBT) por adsorção em carvão ativado obtido da casca de coco de dendê, previamente oxidado com ácido nítrico e impregnado com alumínio (CACD-Al). Experimentos de equilíbrio e cinética foram realizados em sistema fechado e em batelada, em diferentes temperaturas. Os modelos de Langmuir, Freundlich, BET, Radke-Prausnitz e Sips foram ajustados aos dados experimentais, sendo este último o que apresentou o melhor desempenho estatístico, indicando heterogeneidade dos sítios de adsorção. A capacidade máxima obtida foi da ordem de 0,66 mmol g-1 a 30 °C, valor superior ou comparável aos reportados na literatura para carvões ativados aplicados à remoção de DBT. A análise cinética foi descrita satisfatoriamente pelo Modelo de Difusão Superficial Homogênea (HSDM), evidenciando que a difusão intrapartícula é o mecanismo controlador da taxa de adsorção. Os resultados demonstram que o CACD-Al é um adsorvente promissor para a dessulfurização adsortiva de compostos tiofênicos, combinando bom desempenho, baixo custo e origem em resíduo agrícola, com potencial aplicação como etapa complementar aos processos convencionais de remoção de enxofre em combustíveis.

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Biografia do Autor

  • Dr. Aparecido Nivaldo Módenes, Universidade Estadual do Oeste do Paraná

    Docente do Programa de Pós-Graduação em Engenharia Química - PPGEQ da Unioeste, professor associado, departamento de Engenharia Química.

  • Dr. Carlos Eduardo Borba, Universidade Estadual do Oeste do Paraná

    Docente do Programa de Pós-Graduação em Engenharia Química - PPGEQ da Unioeste, professor associado, departamento de Engenharia Química.

  • Ruth Ribeiro Naves Barros , Universidade Estadual do Oeste do Paraná

    Doutoranda, programa de pós-graduação em engenharia química.

  • Dra. Camila Vargas Neves, Universidade Tecnológica Federal do Paraná

    Docente no curso de Tecnologia em Processos Químicos da Universidade Tecnológica Federal do Paraná (UTFPR).

  • Dra. Daniela E. G. Trigueros , Universidade Estadual do Oeste do Paraná

    Docente do Programa de Pós-Graduação em Engenharia Química - PPGEQ da Unioeste, professor associado, departamento de Engenharia Química.

  • Dr. Fernando R. Espinoza-Quiñones , Universidade Estadual do Oeste do Paraná

    Docente do Programa de Pós-Graduação em Engenharia Química - PPGEQ da Unioeste, professor associado, departamento de Engenharia Química.

  • Dra. Isabella C. Dall' Oglio, Universidade Estadual do Oeste do Paraná

    Pós-doutoranda do Programa de Pós-Graduação em Engenharia Química - PPGEQ da Unioeste, professor colaborador do departamento de Engenharia Química.

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Publicado

2026-02-27

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DESSULFURIZAÇÃO ADSORTIVA DE DIBENZOTIOFENO UTILIZANDO CARVÃO ATIVADO DE CASCA DE COCO DE DENDÊ IMPREGNADO COM ALUMÍNIO: ESTUDO DE EQUILÍBRIO E CINÉTICA. (2026). REMUNOM, 2(03), 1-23. https://doi.org/10.66104/mzkh2e26