Preparação e caracterização de catalisadores ácidos de zircônia sulfatada para aplicação na esterificação do óleo de algodão

Silva, F. N.; Moura, Thales Felipe Barbosa de; Silva, A. S.; Pallone, Elíria Maria de Jesus Agnolon; Costa, Ana Cristina Figueiredo de Melo

doi:10.1590/0366-69132017633672067

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…[8] The formation of ZrO 2 was not observed, which indicates that there was no structural modification of the SBU, but the decoupling with the terephthalic acid ligand. [39,49] The results obtained from XRD analysis corroborate with FTIR analysis, indicating a loss of the original MOF crystalline characteristics. However, since there is no evidence of ZrO 2 formation, it is understood that there was no total loss of the presence of the ligand.…”

Section: Catalysts Characterizationsupporting

confidence: 66%

“…The apparent acidity of the catalysts was determined according to the methodology described and adapted from Silva et al [39] which consisted of measuring the sample mass of 0.01 g of synthesized catalyst and solubilizing it in 25 mL of deionized water in a 50 mL beaker, stirring for 5 min. After this time, the pH reading was performed on a bench pH meter.…”

Section: Determination Of the Catalysts' Apparent Aciditymentioning

confidence: 99%

“…[8,47] The bands that represent the symmetrical and asymmetrical stretching of the bonds (O Zr O) at 730 and 700 cm À1 remain, but the presence of zirconium dioxide (ZrO 2 ) formation in the synthesized materials was not observed. [39] The X-ray diffractograms (XRD) for the synthesized materials are shown in Figure 3. It is observed that the synthesized UiO-66 presents all the characteristic signals of its crystalline structure.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

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Synthesis of acidic modified UiO‐66 by concentrated sulphation form and its application in the production of fatty acids ethyl esters

et al. 2023

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In this article, UiO‐66 metal–organic frameworks containing structural modifications were synthesized and characterized to increase acidic surface behaviour for application in heterogeneous acid catalysis to produce fatty acid ethyl esters (FAEE) from degummed soybean oil. The solvothermal route synthesized UiO‐66, and the post‐synthesis acid modifications were done by sulphation reaction in strong acidic medium. The synthesized materials were characterized by physicochemical techniques such as X‐ray diffraction (XRD), C‐ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectrometer (FTIR), and N2 physisorption, observing a strong structural modification of the original UiO‐66, but no signal of sulphated ZrO2 was presented. However, the acidic characteristics on the material's surface were increased. A central compound centred on face 23 experiments design was carried out to evaluate three essential reaction variables: temperature, time, and alcohol/oil ratio, obtaining an optimized fit for the UiO‐66‐S35 of temperature at 140°C, time of 3 h, and molar ratio of 16. The optimized statistical adjustment was applied in the reuse cycles assays in three catalyst cycles, reaching the maximum yield of 95% in FAEE, keeping the catalyst active at the end of 3 cycles.

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Section: Catalysts Characterizationsupporting

confidence: 66%

Section: Determination Of the Catalysts' Apparent Aciditymentioning

confidence: 99%

Section: Catalysts Characterizationmentioning

confidence: 99%

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Synthesis of acidic modified UiO‐66 by concentrated sulphation form and its application in the production of fatty acids ethyl esters

et al. 2023

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A Kinetic Investigation of Triacetin Methanolysis and Assessment of the Stability of a Sulfated Zirconium Oxide Catalyst

Temoteo

Silva

Rodrigues

et al. 2018

J Americ Oil Chem Soc

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In this work, the activity and stability of a sulfated zirconium catalyst in transesterification reactions of triacetin, a model molecule, were investigated. This catalyst has Lewis and Brønsted acid sites and has shown to be highly active in reactions converting triacetin into methyl esters. This catalyst was synthesized using the impregnation method, and systematically characterized using the techniques of x‐rays diffraction (XRD), scanning electron microscopy, Fourier transform‐infrared spectroscopy (FT‐IR), Brunauer, Emmett, and Teller, and thermal gravimetry analysis (TGA). Kinetic studies were carried out to determine the activation energy as well as the reaction order. The effects of the main reaction parameters, such as temperature, the molar ratio, and the catalyst content, were evaluated. The reuse and possible leaching of the catalyst were also investigated. The highest efficiency (ca. 99% of methyl esters) was achieved in the sulfated zirconium oxide‐catalyzed transesterification reaction.

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Photoprotective activity of zirconia nanoparticles

Sá

Arantes

Macedo

et al. 2021

Colloids and Surfaces B: Biointerfaces

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Preparação e caracterização de catalisadores ácidos de zircônia sulfatada para aplicação na esterificação do óleo de algodão

Cited by 4 publications

References 24 publications

Synthesis of acidic modified UiO‐66 by concentrated sulphation form and its application in the production of fatty acids ethyl esters

Synthesis of acidic modified UiO‐66 by concentrated sulphation form and its application in the production of fatty acids ethyl esters

A Kinetic Investigation of Triacetin Methanolysis and Assessment of the Stability of a Sulfated Zirconium Oxide Catalyst

Photoprotective activity of zirconia nanoparticles

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