Potentialization of bentonite properties as support in acid catalysts

Amaya, Jahaziel; Bobadilla, Luis F.; Azancot, Lola; Centeno, Miguel Ángel; Moreno, Sonia; Molina, Rafael

doi:10.1016/j.materresbull.2019.110728

Cited by 16 publications

(42 citation statements)

References 67 publications

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“…These reported catalyst exhibited very good yield towards DHPMS/DHPMTHs with good reusability. Bentonite belongs to the family of smecitie which contains one octahedral sheet and two silica sheets (2 : 1 or tetrahedral‐octahedral‐tetrahedra (TOT) mineral) that form layer through van der waals force and has the general formula as R x (H 2 O) 4 {(Al 2‐x ,Mgx) 2 [(Si,Al) 4 O 10 ](OH) 2 }, R is the exchangeable cations of alkali and alkaline earth metals between layers [56–61] . Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] .…”

Section: Introductionmentioning

confidence: 99%

“…Bentonite belongs to the family of smecitie which contains one octahedral sheet and two silica sheets (2 : 1 or tetrahedral‐octahedral‐tetrahedra (TOT) mineral) that form layer through van der waals force and has the general formula as R x (H 2 O) 4 {(Al 2‐x ,Mgx) 2 [(Si,Al) 4 O 10 ](OH) 2 }, R is the exchangeable cations of alkali and alkaline earth metals between layers [56–61] . Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] . The other unique properties made it a favorable support for immobilization of metals nanoparticles, [57,59,64] metal oxides, [65,66] metal salts [56,60,63,67] and other modification of bentonite for various application [68–76] .…”

Section: Introductionmentioning

confidence: 99%

“…Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] . The other unique properties made it a favorable support for immobilization of metals nanoparticles, [57,59,64] metal oxides, [65,66] metal salts [56,60,63,67] and other modification of bentonite for various application [68–76] . Bentonite is widely distributed in the Kachchh region of India and mainly sodium and calcium bentonite are found in this area.…”

Section: Introductionmentioning

confidence: 99%

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Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Chopda

Dave

2020

ChemistrySelect

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Fe(III) immobilized over natural bentonite (bent) using the impregnation method. Prepared catalysts were well characterized by XRD, FT-IR and FeSEM. The catalytic activity of three catalysts 10, 20 and 30 % Fe(III)/bent evaluated for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones known as Biginelli reaction. The catalyst 30 % Fe(III)/bent exhibited a high yield of the product towards the synthesis of a variety of dihydropyrimidones (DHPMs). The high yield of dihydropyrimidone (DHPM) was obtained in model reaction in ethanol, acetonitrile, DMF and solvent-free condition. The reusability test indicated that 6 % of yield of product decreased after 5 th cycle. Highlights * 10, 20 and 30 % Fe(III) were supported over bentonite clay. The catalysts are well characterized by (XRD), FT-IR, FeSEM and EDS. All charactization method showed that Fe supported over bentonite. * The used catalysts were screened for Biginelli reaction for synthesis dihydropyrimidones. * 30 % Fe(III)/bent exhibited high yield of product towards model Biginelli reaction between benzaldehyde, ethylacetoacetate and urea in ethanol. * 30 % Fe(III)/bent exhibited high yield of product in CH 3 CN, DMF and solvent free-condition. * The catalyst 30 % Fe(III)/bent applied for synthesis of variety of dihydropyrimodone in good yield in CH 3 CN. * Reusability studies show that no great decline in activity after 5 th cycle.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Chopda

Dave

2020

ChemistrySelect

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“…In this case, the insertion of large molecules into the microstructure of clays or on specific sites is performed. After the treatments, the physical properties of the clays change, and meso-and macro-porous materials can be obtained [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, thermal stability and swelling behavior showed a strong relationship with the differences in the electrical charge of the layers, the origin of the charge deficiency, and interlayer cations [11]. Moreover, these features have motivated the study of Colombian clays in different fields such as environmental remediation, catalysts, and waste treatments [7,8,10,12]. Currently, commercial exploitation is mainly concentrated in animal feeding additives and cat litters.…”

Section: Introductionmentioning

confidence: 99%

Colombian clays binary mixtures: physical changes due to thermal treatments

Betancourt

Domínguez-Ortiz

Martínez-Tejada

2020

DYNA

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Usually, smectite clays, which are used for catalytic purposes, are subjected to chemical and thermochemical treatments to enhance their surface features. This research aims to analyze textural and structural features of the physical mixtures of two Colombian smectite clays at room temperature and after the treatment at 600°C, 800°C, and 1000°C. The physical mixtures of two Colombian clays were characterized by X-ray techniques, thermal analysis, and BET surface area to evaluate physical changes resulting from the three thermal treatments. The results showed the appearance of microstructural changes in basal spacing and other crystals minerals because of the loss of carbonates and alkaline oxides in the clays. Additionally, a dramatic reduction in surface area features was evidenced by the temperature increase. Simultaneously, an increase in the pore size was also observed because of the increase of the temperature treatment. The results reveal that the physical mixture is not an appropriate solution to enhance the textural properties of the Colombian clays for sorption or catalytic purposes.

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Lubricant hydrogenation over a functionalized clay‐based Pd catalyst: A combined computational and experimental study

Asadi

Sadjadi

Nekoomanesh‐Haghighi

et al. 2022

Applied Organom Chemis

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In the world of chemical catalysis and with the importance of being especially in the petrochemical industry, hydrogenation reactions play a central role. Within this framework, the hydrogenation of polyalphaolefins (PAOs) is receiving increasing attention. In this work, for the sake of efficiency and to furnish an efficient support for the immobilization of Pd nanoparticles, a new catalyst containing the 1,3‐diaminopropane (DAP) diamine for the decoration of the halloysite (HNT) outer surface is used. The resulting catalytic system exhibited high activity in the hydrogenation of PAOs and high catalyst recyclability since it could be used for several reaction runs, with no appreciable loss of the catalytic activity and Pd leaching. In addition, the nature of the heterogeneous catalysis was demonstrated by a hot filtration test. Density functional theory (DFT) calculations not only unveil the reaction mechanism, in which the rate determining step was determined mechanistically, but also confirm the best location of the palladium nanoparticles, placed between the diamino ligands in the halloysite surface. Furthermore, the computational simulations rationalize why experimentally the catalytic process requires hydrogen pressure of 7 bar and temperature of 130°C to reach high yield.

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Potentialization of bentonite properties as support in acid catalysts

Cited by 16 publications

References 67 publications

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Colombian clays binary mixtures: physical changes due to thermal treatments

Lubricant hydrogenation over a functionalized clay‐based Pd catalyst: A combined computational and experimental study

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