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Mesoporous nanosilica-supported polyoxomolybdate as catalysts for sustainable desulfurization
Publication . Mirante, Fátima; Gomes, Neide; Branco, Luís C.; Cunha-Silva, Luís; Almeida, Pedro L.; Pillinger, Martyn; Gago, Sandra; Granadeiro, Carlos M.; Balula, Salete S.; LAQV@REQUIMTE; DQ - Departamento de Química; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); DCM - Departamento de Ciência dos Materiais; Elsevier Science B.V., Inc
Mesoporous silica nanoparticles (MSNs) strategically functionalized were used to immobilize a homogeneous polyoxomolybdate catalyst [PMo 12 O 40 ] 3- (PMo 12 ), active but unstable. The PMo 12 @TBA-MSN composite (where TBA refers to surface-tethered tributylammonium groups) conferred high stability to the polyoxomolybdate catalytic center and displayed an increase in efficiency for the oxidative desulfurization (ECODS) of a diesel simulant under sustainable conditions (using H 2 O 2 as oxidant and an ionic liquid, [BMIM]PF 6 , as solvent). Continuous reuse of the catalyst and ionic liquid solvent in consecutive ECODS cycles was successfully performed, avoiding the production of residual wastes. The performance of the PMo 12 @TBA-MSN catalyst improved upon its reuse, leading to complete desulfurization of a multicomponent model diesel containing benzothiophene derivatives after just 1 h of the catalytic stage of the process. The robust nature of the supported catalyst was indicated by characterization of the recovered solid which showed retention of the structural and chemical integrities.
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Fundação para a Ciência e a Tecnologia
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5876
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PEst-OE/EME/UI0712/2014