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Alexandre Viana
LAQV/REQUIMTE & Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal

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Journal article
Published: 19 June 2021 in Sustainable Chemistry
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An effective process to remove nitrogen-based compounds from fossil fuels without harming the process of sulfur removal is an actual gap in refineries. A success combination of desulfurization and denitrogenation processes capable of completely removing the most environmental contaminates in diesel under sustainable conditions was achieved in this work, applying polyoxometalates as catalysts, hydrogen peroxide as oxidant, and an immiscible ionic liquid as an extraction solvent. The developed process based in simultaneous oxidative desulfurization (ODS) and oxidative denitrogenation (ODN) involved initial extraction of sulfur and nitrogen compounds followed by catalytic oxidation. Keggin-type polyoxomolybdates revealed much higher reusing capacity than the related polyoxotungstate. Effectively, the first catalysts practically allowed complete sulfur and nitrogen removal only in 1 h of reaction and for ten consecutive cycles, maintaining the original catalyst and ionic liquid samples.

ACS Style

Dinis Silva; Alexandre Viana; Fátima Mirante; Baltazar de Castro; Luís Cunha-Silva; Salete Balula. Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System. Sustainable Chemistry 2021, 2, 382 -391.

AMA Style

Dinis Silva, Alexandre Viana, Fátima Mirante, Baltazar de Castro, Luís Cunha-Silva, Salete Balula. Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System. Sustainable Chemistry. 2021; 2 (2):382-391.

Chicago/Turabian Style

Dinis Silva; Alexandre Viana; Fátima Mirante; Baltazar de Castro; Luís Cunha-Silva; Salete Balula. 2021. "Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System." Sustainable Chemistry 2, no. 2: 382-391.

Journal article
Published: 11 May 2020 in Catalysis Today
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An unprecedented and straightforward strategy towards the activation of metal-organic frameworks UiO-66(Zr) and UiO-66(Hf) in oxidative desulfurization reactions was developed. Post-synthetic treatment of poor-defect pristine UiO-66 materials with chloride-based salts (for example TiCl4) leaded to the preparation of more active and recyclable heterogeneous catalysts for oxidative desulfurization processes. The pristine UiO-66(Hf) showed to be an inactive catalyst; however, after activation treatment 80% of total desulfurization was achieved after 1 h. Also, UiO-66 (Zr) increased appreciably its activity after treatment with chloride-based salts (from 62% from 97% after treatment with TiCl4). The insertion of chloride in UiO-66 framework did not retained the counter-cation Ti(IV). The possible interaction of chloride with UiO-66 framework enhances catalytic activity without structural degradation of catalyst, even after consecutive reaction cycles. Chloride activation method opened a new route to activate efficiently catalytic UiO-66 MOFs. This is a cost-effective method capable to be feasible to other MOFs structures, promoting their catalytic capacities and enlarging their catalytic application.

ACS Style

Alexandre Viana; Diana Julião; Fátima Mirante; Rui G. Faria; Baltazar de Castro; Salete S. Balula; Luís Cunha-Silva. Straightforward activation of metal-organic framework UiO-66 for oxidative desulfurization processes. Catalysis Today 2020, 362, 28 -34.

AMA Style

Alexandre Viana, Diana Julião, Fátima Mirante, Rui G. Faria, Baltazar de Castro, Salete S. Balula, Luís Cunha-Silva. Straightforward activation of metal-organic framework UiO-66 for oxidative desulfurization processes. Catalysis Today. 2020; 362 ():28-34.

Chicago/Turabian Style

Alexandre Viana; Diana Julião; Fátima Mirante; Rui G. Faria; Baltazar de Castro; Salete S. Balula; Luís Cunha-Silva. 2020. "Straightforward activation of metal-organic framework UiO-66 for oxidative desulfurization processes." Catalysis Today 362, no. : 28-34.

Journal article
Published: 17 September 2019 in Materials
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Porous metal-organic framework (MOF) materials UiO-66(Zr) obtained by solvothermal and microwave advanced synthesis (MWAS) procedures were characterized, and their catalytic efficiency was investigated for oxidative desulfurization (ODS) processes using a multicomponent model diesel containing benzothiophene and dibenzothiophene derivatives. The preparation parameters as the cooling time after oven use in the solvothermal procedure, and also the reaction time in the MWAS method seemed to play an important role in the catalytic performance of the UiO-66(Zr) material, as well as in its recycle capacity. The material prepared by the solvothermal procedure with a fast cooling time showed the best catalytic performance (desulfurization efficiency of 99.5% after 3 h). However, the application of the UiO-66(Zr) material prepared by the MWAS method (desulfurization efficiency of 96% after 3 h) conciliated a higher number of advantages, such as shorter reaction time preparation (15 min) and high catalytic activity for a higher number of reaction cycles. The UiO-66(Zr) prepared by the MWAS method was used for the first time in an oxidative desulfurization process, and according to the catalytic results obtained (high recycle capacity and stability) and shorter reaction time preparation, seems to be a promising material for industrial application.

ACS Style

Alexandre Viana; Susana O. Ribeiro; Baltazar De Castro; Salete S. Balula; Luís Cunha-Silva. Influence of UiO-66(Zr) Preparation Strategies in Its Catalytic Efficiency for Desulfurization Process. Materials 2019, 12, 3009 .

AMA Style

Alexandre Viana, Susana O. Ribeiro, Baltazar De Castro, Salete S. Balula, Luís Cunha-Silva. Influence of UiO-66(Zr) Preparation Strategies in Its Catalytic Efficiency for Desulfurization Process. Materials. 2019; 12 (18):3009.

Chicago/Turabian Style

Alexandre Viana; Susana O. Ribeiro; Baltazar De Castro; Salete S. Balula; Luís Cunha-Silva. 2019. "Influence of UiO-66(Zr) Preparation Strategies in Its Catalytic Efficiency for Desulfurization Process." Materials 12, no. 18: 3009.