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Resumo(s)
A straightforward innovative strategy to improve the reusability of a polyoxometalate/porous metal-organic framework (POM/MOF) heterogeneous catalysts based in suitable structural modification by thermal treatment is reported in this manuscript for the first time. The incorporation of the active Keggin-type phosphomolybdate anion ([PMo12O40]3-, PMo12) into the porous Zeolitic Imidazolate Framework (ZIF-8) led to the formation of the composite material PMo12@ZIF-8. This material exhibited catalytic activity during the first use but could not be reused in subsequent oxidative desulfurization (ODS) cycles of a multicomponent model diesel (2000 ppm S). Remarkably, an appropriate post-synthetic thermal treatment at temperatures slightly below the structural collapse point (400 °C and 500 °C), as well as at 550 °C, enabled efficient reutilization of the material. This modified material was reutilized for at least five consecutive ODS cycles without any observable loss in catalytic performance. These results confirm the integrity and durability of the heterogeneous catalyst. The methodology here developed is a reference that can be adapted to improve the robustness of active POM@MOF based catalyst, increasing the viability of these highly active materials for industrial application.
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Palavras-chave
Catalyst reutilization Extractive catalytic oxidative desulfurization Nanocomposite material Polyoxometalates Zeolitic imidazolate frameworks General Chemistry General Materials Science Condensed Matter Physics Mechanics of Materials