v. 36 n. 2 (2023): Revista ION
Artigos

Catalisadores CoMo suportados em hidrotalcitas terciárias calcinadas (MeFeAl, Me2+: Co2+, Ni2+, Mg2+, Zn2+) para a reação de hidrodessulfurização de dibenzotiofeno

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  • Edwin Oviedo,
  • Carlos Linares,
  • Sylvette Brunet
Edwin Oviedo
Docente Universitario
DOI: https://doi.org/10.18273/revion.v36n2-2023004

Publicado 2023-06-30

Palavras-chave

  • hidrotalcite, hidrodessulfuração, dibenzotiofeno, número de cetano, gasóleo, Diesel,
  • diesel,
  • hidrodessulfuração,
  • gasóleo,
  • número de cetano,
  • dibenzotiofeno,
  • hidrotalcite
    • ...Mais
    Menos

Como Citar

Oviedo, E., Linares, C., & Brunet, S. (2023). Catalisadores CoMo suportados em hidrotalcitas terciárias calcinadas (MeFeAl, Me2+: Co2+, Ni2+, Mg2+, Zn2+) para a reação de hidrodessulfurização de dibenzotiofeno. REVISTA ION, 36(2), 47–62. https://doi.org/10.18273/revion.v36n2-2023004

Copyright (c) 2023 Edwin Oviedo, Carlos Linares, Sylvette Brunet

Creative Commons License
Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.

Resumo

Cinco hidrotalcitas terciárias contendo Fe3+ e Al3+ e Mg2+, Co2+, Ni2+ ou Zn2+ como cátions divalentes foram sintetizadas. Uma razão molar [M+3/(M3++M2+)] de 0,22 e uma razão molar de [Fe3+/Al3+] de 0,66 foram mantidas; com exceção da hidrotalcita MgFeAl cuja razão molar foi dobrada. Os óxidos dessas hidrotalcitas foram utilizados como suportes da fase ativa (Mo) promovida com Co. Hidrotalcitas, óxidos mistos e seus precursores catalíticos foram caracterizados pelas técnicas de análise química por fluorescência de raios X, medições de superfície, difração de raios X (DRX), dessorção de temperatura programada (TPD-CO2), análise elementar (C e S) e microscopia eletrônica de transmissão de alta resolução. Todos os precursores catalíticos foram testados na reação de hidrodessulfuração do dibenzotiofeno apresentando a seguinte ordem de atividade: CoMo/γ-Al2
O3> CoMo/MgFeAl(0,66)> CoMo/MgFeAl(1,32)> CoMo/CoFeAl> CoMo/NiFeAl> Como/ZnFeAl. A atividade catalítica e a seletividade para a formação de produtos de hidrogenação com relação à dessulfuração direta (HID/DSD) aumentaram com o aumento da basicidade do catalisador. Esses resultados foram associados à fração de Mo (fMo) e à natureza do suporte. É importante mencionar que os catalisadores: CoMo/MgFeAl(0,66) e CoMo/MgFeAl(1,32) apresentaram a maior seletividade para a rota de hidrogenação em relação ao catalisador de referência. Adicionalmente, a atividade do catalisador CoMo/MgFeAL(0,66) em direção à via HID foi a mais alta, excedendo inclusive a atividade de CoMo/γ-Al2O3.

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