Browsing by Author "Dongil, Ana Belén"

Now showing 1 - 11 of 11
  • Thumbnail Image
    Item
    Biomass and CO2-Derived Fuels Through Carbon-Based Catalysis. Recent Advances and Future Challenges
    (2023) Peixoto, Andreia F.; Fernandes, Diana M.; Dongil, Ana Belén; Blanco, Elodie; Freire, Cristina
  • Thumbnail Image
    Item
    Effect of carbon support and functionalization on the synthesis of rhenium carbide and its use on HDO of guaiacol
    (2023) Blanco, Elodie; Cabeza, Paula; Naharro Ovejero, Verónica; Contreras, Claudio; Dongil, Ana Belén; Ghampson, Isaac Tyrone; Escalona, Néstor
  • Thumbnail Image
    Item
    Effect of the Carbon Support and Conditions on the Carbothermal Synthesis of Cu-Molybdenum Carbide and Its Application on CO2 Hydrogenation to Methanol
    (2022) Dongil, Ana Belén; Blanco, Elodie; Villora-Pico, Juan José; Sepúlveda-Escribano, Antonio; Rodríguez-Ramos, Inmaculada
  • Thumbnail Image
    Item
    Effect of the Support Functionalization of Mono- and Bimetallic Ni/Co Supported on Graphene in Hydrodeoxygenation of Guaiacol
    (2021) Blanco, Elodie; Carrales-Alvarado, Damarys; Dongil, Ana Belén; Escalona, Néstor
  • Thumbnail Image
    Item
    Effect of the Support on Rhenium Carbide in the Hydrodeoxygenation of Guaiacol as Lignin-Derived Model Compound
    (2022) Blanco, Elodie; Dongil, Ana Belén; Ghampson, Isaac Tyrone; Escalona, Néstor
  • Thumbnail Image
    Item
    Insights in supported rhenium carbide catalysts for hydroconversion of lignin-derived compounds
    (2020) Blanco, Elodie; Dongil, Ana Belén; García-Fierro, José Luis; Escalona, Néstor
  • Thumbnail Image
    Item
    Optimizing the carburization conditions of supported rhenium carbide for guaiacol conversion
    (2021) Blanco, Elodie; Dongil, Ana Belén; Ghampson, Isaac Tyrone; García-Fierro, José Luis; Escalona, Néstor
  • Thumbnail Image
    Item
    Selective benzaldehyde/acetone to benzalacetone cross-aldol condensation catalyzed by UiO-66 MOFs
    (2025) Pazo Carballo, Cesar Alexander; Camu Macaya, Esteban Alonso; Yoan Hidalgo-Rosa; Llanos, Jaime; Zarate, Ximena; Dongil, Ana Belén; Schott Verdugo, Eduardo Enrique; Escalona Burgos, Nestor Guillermo
    Cross-aldol condensation reactions are an important family of reactions that generate added-value chemicals with long chain products. Those products have multiple applications, such as those in the pharmaceutical industry, flavors and fragrances, agricultural chemicals and fine and specialty chemicals, among others. Possible products are long chain aromatic compounds, which could be used to generate fuels. The ability to generate that kind of fuel from biomass has been a challenge over the last few years. In this report the cross-aldol condensation reaction study using a family of UiO-66 MOFs between benzaldehyde and acetone to produce benzalacetone was performed. Thus, a family of UiO-66 MOFs was synthesized and characterized (by means of N2 physisorption, NH3-TPD, CO2-TPD, ATR-FTIR, and powder X-ray diffraction) and its catalytic activity was studied in detail. Good conversion and selectivity were obtained. A thorough study of the kinetics of this reaction was performed for all the used UiO-66 MOFs. In this sense, the Langmuir–Hinshelwood kinetic models fitted the experimental data. The behavior predictions using different metals (Zr, Hf or Zr/Hf) and linkers (BDC or PDC) were fitted from the bimolecular one-site and two-site models. Competitive and non-competitive mechanisms were used to explain the production of the main intermediate compound (β-hydroxy ketone). The catalyst Zr/Hf-UiO-66 showed the best activity, which could be attributed to the greater total interaction energy of benzaldehyde/acetone on the catalyst surface (as shown by DFT calculations). A synergetic effect is observed for the bimetallic UiO-66 catalyst between Zr and Hf, obtaining a higher reaction rate than for the monometallic catalysts. Furthermore, a similar effect was reflected in the TOF for Zr/Hf-UiO-66. The best selectivity towards benzalacetone was obtained for Hf-UiO-66-PDC under iso-conversion conditions. Finally, depending on the metal–linker pair, differences in the benzaldehyde/acetone adsorption modes were observed, indicating the presence of bimolecular kinetic adjustments at one and two sites for the aldol condensation of benzaldehyde. All the results shown herein were supported by means of DFT calculations.
  • Thumbnail Image
    Item
    Sulfate-modified MOF-808 as a superacid catalyst: a performance evaluation of Zr(iv) and Hf(iv) analogues in acetalization reactions
    (2025) Roa Gómez, Vanesa Belen; Cea, Sebastián; Pazo Carballo, César Alexander; Llanos, Jaime; Olivares, Douglas; Escalona, Néstor; Leiva Campusano, Ángel; Hidalgo-Rosa, Yoan; Zarate, Ximena; Dongil, Ana Belén; Schott Verdugo, Eduardo
    In this study, we report the synthesis and characterization of MOF-808-SO4-M (M = Zr(IV), Hf(IV)), derived from MOF-808-M precursors. The introduction of sulfate groups enhances the Brønsted acidity of these materials, significantly improving their catalytic performance in the benzaldehyde acetalization reaction. The materials were characterized using powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FT-IR), nitrogen adsorption–desorption analysis, thermogravimetric analysis (TGA), energy-dispersive spectroscopy (EDS), and Hammett indicator tests. Catalytic evaluation revealed that MOF-808-SO4-Zr exhibited significantly higher conversion compared to its Hf-based analogue, a difference attributed to its greater density of acid sites, as confirmed by temperature-programmed surface reaction (TPSR) analysis. These experimental results were further supported by density functional theory (DFT) calculations, which provided insights into the acidic properties and catalytic behavior of the materials.
  • Thumbnail Image
    Item
    Synergy between Ni and Co Nanoparticles Supported on Carbon in Guaiacol Conversion
    (2020) Blanco, Elodie; Dongil, Ana Belén; Escalona, Néstor
  • Thumbnail Image
    Item
    Theoretical and Experimental Study for Cross-Coupling Aldol Condensation over Mono- and Bimetallic UiO-66 Nanocatalysts
    (2023) Pazo Carballo, César Alexander; Blanco, Elodie; Camu, Esteban; Leiva Campusano, Ángel; Hidalgo-Rosa, Yoan; Zarate, Ximena; Dongil, Ana Belén; Schott Verdugo, Eduardo Enrique; Escalona, Néstor
    Mono- and bimetallic UiO-66 nanocatalysts were synthesized using the solvothermal synthesis method and evaluated in the aldol condensation reaction of benzaldehyde and acetone in a batch reactor. N2 physisorption, thermogravimetric analysis, temperature-programmed desorption of ammonia, X-ray diffraction, field-emission scanning electron microscopy–energy-dispersive X-ray, X-ray photoelectron spectroscopy, potentiometric titration, and Fourier transform infrared were used to characterize the nanocatalysts. The higher activity exhibited by the Zr/Hf-UiO-66 catalyst could be attributed to the lower orbital energy interaction with benzaldehyde, as shown by density functional theory. A synergetic effect is observed for the bimetallic UiO-66 nanocatalyst between Zr and Hf, obtaining a higher reaction rate than the monometallic nanocatalysts. Meanwhile, this antagonistic effect was shown in the bimetallic catalysts between Zr and Ce, which was less active than the monometallic UiO-66 catalyst due to free COOH generated during the synthesis. Finally, the selectivity results showed that incorporating Hf and Ce on Zr-UiO-66 favors benzalacetone formation by cross-coupling condensation of benzaldehyde and acetone at isoconversion conditions.