Effect of the Acid Treatment of Montmorillonite Clay in the Oleic Acid Esterification Reaction

Nascimento, A. R. do; Alves, José Antônio Barros Leal Reis; Melo, D.M.A.; Melo, Dulce Maria de Araújo; Souza, M. J. B.; Pedrosa, Anne Michelle Garrido

doi:10.1590/1516-1439.293014

Cited by 20 publications

(8 citation statements)

References 26 publications

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“…the indexed CeO 2 cubic system, unit cell and cubic face centered space group (Nascimento et al, 2015;Nascimento et al, 2014). The results indicate that Ce is successfully incorporated into the Kaolin clay support.…”

Section: Catalyst Characterizationmentioning

confidence: 83%

Ce/kaolin clay as an active catalyst for fatty acid methyl esters production from cottonseed oil in a new integrated apparatus

Liu

Gui

2018

Braz. J. Chem. Eng.

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An efficient solid acid catalyst (Ce/Kaolin clay) was prepared and investigated for transesterification of cottonseed oil to fatty acid methyl esters (FAME). The catalysts were characterized by XRD, BET, and NH 3-TPD measurements. A new integrated apparatus for extraction and transesterification of cottonseed oil was developed. The effects of cerium loading, catalyst calcination temperature, methanol flow rate, reaction temperature, reaction time, and catalyst amount were also investigated. The results indicated that the Ce/Kaolin clay showed high catalytic activity under the calcination temperature of 700 o C and cerium loading of 0.05 g/g. The optimum transesterification reaction conditions were as follows: methanol flow rate 4.0 mL/min, reaction temperature 60 o C,reaction time 3 h, and catalyst amount 15 g. Under these conditions, the yield of FAME was up to 91%.The catalytic activity of Ce/Kaolin clay still remained high after 4 times of repeated use. The results indicated that the Ce/Kaolin clay catalysts had a good potential for use in the large-scale production of FAME.

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Section: Catalyst Characterizationmentioning

confidence: 83%

Ce/kaolin clay as an active catalyst for fatty acid methyl esters production from cottonseed oil in a new integrated apparatus

Liu

Gui

2018

Braz. J. Chem. Eng.

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“…Among various quartz phases the most prominent one was obtained at 2θ = 26.68° (d = 3.3385 Å) [39]. From the figure it is evident that the quartz phase was highly affected by acid treatment because the intensity of quartz phase was reduced to a significant extent [40]. Although the kaolinite phases were not strongly affected by acid treatment, the lowering of the intensity of the peaks was attributed to the structural disorder [41].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 93%

pH Induced Fabrication of Kaolinite-Chitosan Biocomposite

Dey

Al‐Amin

Rashid

et al. 2016

ILCPA

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Abstract. Functionalization of indigenous materials improves inherent physicochemical properties that depend mainly on their fabrication techniques. Here, pH triggered biocomposites using different proportions of kaolinite and chitosan were fabricated. It was revealed that the biocomposites were formed in 1M acetic acid and stabilized after dropwise addition of the mixture of kaolinite and chitosan solution in 3M NaOH. Binding of kaolinite and chitosan at their interface through functional groups was studied using Fourier transform infrared (FT-IR) spectroscopy and dynamic light scattering (DLS). The average particle size of the biocomposite in aqueous system having 80% w/w kaolinite and 20% w/w chitosan was determined to be 400.8 nm. Crystallinity disappearance of chitosan in the biocomposite, as shown in x-ray diffraction (XRD) spectrum, supports the wrapping of kaolinite with soft and flexible chitosan. Differential scanning calorimetry (DSC) showed the thermal stability of the biocomposites and it was found that the biocomposite fabricated from 50% w/w kaolinite and 50% w/w chitosan was stabled up to 318 o C. Morphological studies were carried out using scanning electron microscopy (SEM), where a progressive tendency towards granular morphology was evidenced with increase in kaolinite content. These functionalized materials in bionanocomposite structure would play a vital role in advanced research in analytical and environmental science.

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“…34−37 The use of these materials as heterogeneous catalysts is a powerful and interesting method for the development of green protocols by minimizing the dangerous waste related to organic syntheses. Natural or modified clays are effectively used in a wide range of chemical reactions such as reduction of methylene blue, 38 esterification reactions, 39 hydroxylations of arylboronic acids, 40 cyclization reactions, 41 hydration of nitriles to amides, 42 allylsilylations of aromatic and aliphatic alkenes, 43 and synthesis of 1,3-oxazines. 44 In addition, these reactions are often carried out under mild conditions, providing high yields with good selectivities.…”

Section: Introductionmentioning

confidence: 99%

Acid-activated clay as heterogeneous and reusable catalyst for the synthesis ofbioactive cyclic ketal derivatives

Hagui¹,

Amri²,

Farès³

et al. 2019

Turk J Chem

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A new heterogeneous acid catalyst based on a natural resource, Tunisian clay (Clay-H0.5), has been prepared and characterized by FT-IR, FE-SEM, and powder X-ray diffraction (XRD), as well as chemical composition, cation exchange capacity, specific surface area, and pore volume. Acid treatment for 0.5 h enlarged the surface area from 78.24 to 186.10 m 2 /g and pore volume (PV) from 0.186 to 0.281 cm 3 /g. The catalytic activity of this material was investigated in ketalization reaction under mild solvent-free conditions. This achieved up to 92% isolated yield for only 10 wt.% of the catalyst. This environmentally friendly method has advantages such as simple work-up procedure, avoidance of organic solvents, and good performance in ketalization reactions. Importantly, the Clay-H0.5 catalyst showed good recyclability where insignificant activity loss was exhibited even after six runs. Synthesized cyclic ketals were tested for their possible antileishmanial and antibacterial activities as well as antifungal activity. Biological screening showed that compound 11 had important antileishmanial activity against both L. major and L. infantum, while compound 14 also had significant antibacterial activity against four gram-positive and two gram-negative bacteria, and antifungal activity against Candida albicans, with minimal inhibitory concentration values ranging from 15.62 µg/mL to 125 µg/mL.

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Effect of the Acid Treatment of Montmorillonite Clay in the Oleic Acid Esterification Reaction

Cited by 20 publications

References 26 publications

Ce/kaolin clay as an active catalyst for fatty acid methyl esters production from cottonseed oil in a new integrated apparatus

Ce/kaolin clay as an active catalyst for fatty acid methyl esters production from cottonseed oil in a new integrated apparatus

pH Induced Fabrication of Kaolinite-Chitosan Biocomposite

Acid-activated clay as heterogeneous and reusable catalyst for the synthesis ofbioactive cyclic ketal derivatives

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