Catalytic isomerization of α-pinene oxide in the presence of acid-modified clays

Sidorenko, A.Yu.; Кравцова, А.В.; Aho, Atte; Heinmaa, Ivo; Kuznetsova, T. F.; Murzin, Dmitry Yu.; Agabekov, V. E.

doi:10.1016/j.mcat.2018.01.021

Cited by 28 publications

(11 citation statements)

References 45 publications

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“…3. All the samples show a broad, intense absorption band with a maximum at 1030 cm −1 associated with the Si-O stretching vibrations (Theodosoglou et al 2010;Hsiao et al 2017;Sidorenko et al 2018).…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

“…The peak at 1030 cm −1 and also in the 550-400 and 3700-3600 cm −1 regions in the S1, S2 and S3 acid-treated samples are retained, indicating the absence of significant destruction of the structure. Contrarily, the peaks associated with the S4 sample become less intense, thus suggesting that the material structure started to shatter (Sidorenko et al 2018). Table 3 shows the textural properties obtained from nitrogen adsorption-desorption isotherms, as well as the superficial acid properties for samples S0-S4.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

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Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Reinoso

Angeletti

Cervellini

et al. 2020

Braz. J. Chem. Eng.

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This paper aims to characterize a natural sediment from Bahía Blanca estuary (Argentina) as a new clay source and determine the catalytic capacity after its structural modification by an acid activation process. The acid treatment was performed by employing H 2 SO 4 at different concentrations at 353 K and 60 min. The raw material and acid-activated samples were characterized by XRD, XRF, FTIR, N 2 physisorption, TGA, SEM, EDX, potentiometric titration and pyridine adsorption monitored by FTIR. Moreover, the catalytic activity on lauric acid esterification with methanol was evaluated as a test reaction. From the structural characterization, it was determined that the material studied contains mainly Ca-montmorillonite, illite, albite and quartz. Likewise, the results obtained showed that the acid-treatment impacts the material characteristics, predominantly surface acidity and textural properties. Particularly, it was evidenced that the samples treated under medium acid activation conditions lead to an increase in acid site number and strength and specific surface area and consequently improve the catalytic activity. The results obtained evidenced that this low cost and widely available raw material presents an interesting mineralogical composition with a high clay mineral content. Additionally, the catalytic performance showed a good conversion in the test reaction regarding other heterogeneous catalysts. Hence, considering these results, this natural sediment merits further research on its purification and application.

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Reinoso

Angeletti

Cervellini

et al. 2020

Braz. J. Chem. Eng.

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“…Indeed, the treatment with minerals acids significantly changed their textural characteristics. This can expand their applications to include environmental protection [14,15], catalytic cracking of petroleum [16], catalyst supports in many chemical processes and detergent in paper industries and textile fabrications [17][18][19]. In fact, the most applications of these clays are bleaching, purification and stabilization of vegetable oils.…”

Section: Introductionmentioning

confidence: 99%

Effect of Structure and Chemical Activation on the Adsorption Properties of Green Clay Minerals for the Removal of Cationic Dye

et al. 2018

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In this study, natural clay minerals with green appearance were treated with sulfuric acid. Mass percentage of acid (wt%), temperature (T), contact time (t) and liquid-to-solid mass ratio (R) are used as the prevailing factors that determine the extent of acid-activation. The values of these factors range from 15–50%, 60–90 °C, 1.5–6 h and 4–7, respectively. The study has focused on the structural changes as well as textural characteristics of the clay. Three activated clay samples were prepared under different treatment conditions. The samples were characterized using X-ray powder diffraction (XRD), fourier transform infrared (FTIR), scanning electron microscope (SEM), chemical analysis and N2 adsorption techniques. Characterization of the treated clay minerals exhibited significant structural changes to a greater extent of acid-activation, from being partially crystalline to being amorphous silica. The surface area and total pore volume of clay increased proportionally with the level of acid treatment. The average pore diameter behaved differently. During the strong acid treatment, a large increase in pore volume and the enlargement of the pore size distribution were observed. This suggests that considerable structural changes and partial destruction may have occurred in this condition. The removal of methylene blue, used as cationic dye, from aqueous solution by the batch adsorption technique on three prepared acid-activated clay samples was studied. The Langmuir model was found to agree well with the experimental data.

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“…6). The PIN clay and PIN-MOD clay spectra presented characteristic bands at 3455 cm -1 , attributed to the vibrations of the hydroxyl groups of water molecules, in addition to angular deformation for the adsorbed water molecules identified in 1648 cm -1 [22,23]. The band at 3621 cm -1 was attributed to the structural -OH [23].…”

Section: Resultsmentioning

confidence: 95%

“…The PIN clay and PIN-MOD clay spectra presented characteristic bands at 3455 cm -1 , attributed to the vibrations of the hydroxyl groups of water molecules, in addition to angular deformation for the adsorbed water molecules identified in 1648 cm -1 [22,23]. The band at 3621 cm -1 was attributed to the structural -OH [23]. The 1421 cm -1 adsorption band in the PIN clay attributed to the stretching vibrations of the CO 3 2ion (from calcite) disappeared after the acid treatment due to the reaction with HCl, thereby forming CO 2 and H 2 O [23].…”

Section: Resultsmentioning

confidence: 99%

Modeling, equilibrium and kinetics of CO2 adsorption in LTA zeolite obtained from clay

et al. 2021

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This paper discussed the synthesis of LTA zeolite from Pinheiro clay (PIN) aiming for adsorption of CO 2 . To obtain the LTA-PIN zeolite, the PIN was submitted to acid treatment, followed by calcination and hydrothermal treatment. These treatments promoted the reorganization of the crystalline structure of the PIN, leading to the LTA-PIN zeolite with 95.79% purity confirmed by XRD, SEM, XRF, and FTIR results. The performance of the LTA-PIN zeolite was similar to the one of the standard LTA zeolite. The CO 2 adsorption by the zeolites could be properly described by the pseudo-second-order kinetic and Freundlich isotherm models, suggesting that physisorption was the main mechanism responsible for the deposition of CO 2 at the surface of the zeolites. According to regeneration results, LTA-PIN zeolite can be reused five times without significant loss of CO 2 adsorption capacity, contrary to the 12% reduction in CO 2 adsorption capacity presented by the LTA-standard zeolite.

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Catalytic isomerization of α-pinene oxide in the presence of acid-modified clays

Cited by 28 publications

References 45 publications

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Effect of Structure and Chemical Activation on the Adsorption Properties of Green Clay Minerals for the Removal of Cationic Dye

Modeling, equilibrium and kinetics of CO2 adsorption in LTA zeolite obtained from clay

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