Oxidative desulfurization of dibenzothiophene over highly dispersed Mo-doped graphitic carbon nitride
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Resumo
Mo-doped graphitic carbon nitride (Mo/g-C3N4) was successfully prepared by thermal condensation of a Mo/melamine
precursor in a semi-closed alumina crucible at 550 °C without atmosphere. Thermogravimetric analysis (TGA) was used
to evaluate the polymerization route of the precursor, and theoretical and experimental investigations revealed that the Mo
species were likely dispersed and anchored to the pyridinic groups of g-C3N4. As a result, the obtained Mo/g-C3N4 displayed
exceptional catalytic activity in the oxidative desulfurization of dibenzothiophene (DBT) with H2O2. The effects of catalyst
dosage, O/S ratio, and temperature on the catalytic properties of Mo/g-C3N4 were investigated. The kinetic studies revealed
a pseudo-first-order kinetic process for DBT oxidation with an apparent activation energy of 43.6 kJ mol−1. Experimental
and theoretical evaluation of the Mo/g-C3N4 stability suggests that catalytically active Mo species are progressively leached
from the g-C3N4 structure. The decrease in the Mo–N bond order after forming reactive peroxo-Mo(VI) groups was associated with catalyst deactivation.
Abstract
Assunto
Nitreto de carbono, Dessulfuração
Palavras-chave
Graphitic carbon nitride, Oxidative desulfurization, Dibenzothiophene
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https://link.springer.com/article/10.1007/s11696-022-02113-3