Cobalt-Based Sandwich-Type Polyoxometalate Supported on Amino-Silane Decorated Magnetic Graphene Oxide : A Beneficial and Recoverable Catalyst for Extractive-Catalytic Oxidative Desulfurization of Model Oil
In order to produce ultra-low sulfur fuel, a sandwich-type polyoxometalate (K10[Co4(H2O)2(PW9O34)2]10- (Co4-POM) was covalently immobilized on amino-modified magnetic graphene oxide. The (Co4-POM@APTES-(Fe3O4/GO)) nanocomposite was employed as a novel heterogeneous catalyst in an extractive- catalytic oxidative desulfurization system (ECODS). The textural and surface properties of the prepared samples were characterized by XRD, FT-IR, SEM, EDX, N2 adsorption, and VSM techniques. Also, the influence of the Co4-POM load percentage (10, 20, 30, and 40 wt%), reaction temperature, catalyst dosage, and H2O2/DBT molar ratio was investigated on the catalytic performance of the prepared catalysts. The results showed that the highest catalytic activity was observed for Co4-POM loadings of 30 wt %. Dibenzothiophene (DBT) was removed completely within 30 min at 50 °C using 4 g cat L-1 fuel and H2O2/DBT molar ratio of 4. The nanocomposite can be easily separated and reused by utilizing an external magnetic field without any substantial decline in its catalytic activity even after five runs. The kinetics of the reaction was fitted to a pseudo-first-order model. Finally, a reaction mechanism for the catalytic oxidation of DBT by the magnetic catalyst of Co4-POM@APTES-(Fe3O4/GO) was proposed
Year of publication: |
[2022]
|
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Authors: | Mohammadi Nejati, Fariba ; Shahhosseini, Shahrokh ; Rezaei, M. |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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