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Cunha-Silva, Luís

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4D15-6F4B-80A2
0000-0001-9229-1412

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2016 - 20192
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  • Mesoporous nanosilica-supported polyoxomolybdate as catalysts for sustainable desulfurization
    Publication . Mirante, Fátima; Gomes, Neide; Branco, Luis; Cunha-Silva, Luís; Almeida, Pedro L.; Pillinger, Martyn; Gago, S.; Granadeiro, Carlos; Balula, Salete
    Mesoporous silica nanoparticles (MSNs) strategically functionalized were used to immobilize a homogeneous polyoxomolybdate catalyst [PMo12O40](3-) (PMo12), active but unstable. The PMo12@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 H2O2 as oxidant and an ionic liquid, [BMIM]PF6, 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 PMo12@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.
    2019-02Journal article Restricted access Show more
  • A novel red emitting material based on polyoxometalate@periodic mesoporous organosilica
    Publication . Granadeiro, Carlos; Ribeiro, Susana; Kaczmarek, Anna M.; Cunha-Silva, Luis; Almeida, Pedro L.; Gago, Sandra; Van Deun, Rik; De Castro, Baltazar; Balula, Salete
    The first lanthanopolyoxometalate-supported bifunctional periodic mesoporous organosilica (BPMO) composite is here reported. The incorporation of decatunsgstoeuropate anions ([Eu(W5O18)(2)](9-)) within the porous channels of an ethylene-bridged TIVIAPS-functionalized BPMO produced a luminescent material exhibiting a strong red emission under UV irradiation. Photoluminescence studies showed an efficient energy transfer process to the lanthanide emitting center in the material (antenna effect). A significant change in the coordination environment of Eu3+ ions was observed after its incorporation into the TMAPS-functionalized material. The possible reason for this is discussed within the paper.
    2016-11Journal article Restricted access Show more