Hydrogenation of Vegetable Oils over a Palladium Catalyst Supported on Activated Diatomite

Toshtay, Kainaubek; Auezov, A. B.

doi:10.1134/s2070050420010109

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…После этого катализатор отмывали дистиллированной водой, отфильтровывали и сушили при 110 о С. Таким образом получали катализаторы с содержанием платины 0.2, 0.5 и 1.0 % Pt/Д. Физико-химические свойства носителя подробно описаны в [17,18].…”

Section: экспериментальная частьunclassified

New Stereoselective Catalysts for the Hydrogenation of Sunflower Oil

Toshtay,

Auyezov

2023

Chem. J. of Kaz.

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The work is devoted to the creation of new stereoselective catalysts for the hydrogenation of sunflower oil, which can significantly reduce the trans-isomers of fatty acids. Thus, on nickel catalysts used in industry, the content of trans-isomers of fatty acids reaches up to 30%. Platinum deposited on diatomite (processed natural clay) 0.2 to 1% is offered as a catalyst. Methodology. The hydrogenation was carried out in an autoclave, excluding external diffusion inhibition, at hydrogen pressures ranging from 0.25 to 1.0 MPa and temperatures ranging from 90 to 110°C. Results and discussion. Chromatographic analysis was used in all cases to determine the isomeric composition of fatty acids, making it possible for the first time to change hydrogen pressure and reaction temperature without changing the isomeric composition. This allows the study of how stereoisomeric composition changes during the hydrogenation of fatty acids. Various physical methods are used to verify catalysts: TPD, BET, and TEM, etc., which can determine catalyst particle size, hydrogen adsorption forms, and specific surfaces. Conclusion. These characteristics were correlated with the activity and stereoselectivity of the studied catalysts. Trans-fatty acids are found to be two to three times lower on platinum catalysts than on nickel catalysts.

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Section: экспериментальная частьunclassified

New Stereoselective Catalysts for the Hydrogenation of Sunflower Oil

Toshtay,

Auyezov

2023

Chem. J. of Kaz.

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“…Vegetable oil-derived compounds such as castor oil-based ricinoleic acid (12-hydroxy-9-octadecenoic acid) have been considered to be an important alternative to diesel fuel. − Methyl undecenoate, which comes from methyl ricinoleate pyrolysis, is also an interesting substrate because its carbon chain length is suitable for jet fuels . The CC hydrogenation of oleochemicals, one of the most encountered chemical transformations for these compounds, involves metal heterogeneous catalysts in most of the cases. − For non-noble-metal-based hydrogenation catalysts, nickel and copper appear to be good candidates. − Supported catalysts containing noble metals, for example, rhodium, palladium, − ruthenium, − and platinum , have also been investigated. According to our literature survey, the reaction conditions with supported metal catalysts are generally harsh in terms of temperature.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenation of Derived Vegetable Oils Using Ion-Exchange Resin-Supported Ruthenium Nanoparticles: Scope and Limitations

Madureira

Noël

Léger

et al. 2022

ACS Sustainable Chem. Eng.

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The hydrogenation of vegetable oil-derived compounds using ion-exchange resin-supported ruthenium nanoparticles is reported for the first time. These supported metal catalysts (Ru_DOWEX 2 -X) were prepared by a simple two-step procedure using commercial and cheap materials, affording high efficiency with a low metal loading. They were characterized by several physicochemical techniques and showed well-dispersed ruthenium nanoparticles into robust beads of the strong cation-exchange resin DOWEX 2 -X. Their catalytic activity was evaluated for the hydrogenation of methyl undecenoate in heptane under mild experimental conditions (30 °C, 10 bar of H 2 ), and the high activities of the metal solid catalysts deeply depended on the amount of water inside the pores. In terms of recyclability, several physicochemical analyses after successive catalytic runs showed the robustness of the immobilized ruthenium nanoparticles, for which very low metal leaching and no particle aggregation were observed. The decrease in the catalytic activity could be explained by progressive water loss contained in the resin pores, which was illustrated by a decrease in the bead diameter. The immobilized ruthenium nanoparticles were also evaluated in the catalytic hydrogenation of vegetable oils and their corresponding methyl esters and showed a remarkably high activity compared to other catalytic systems tested under similar mild reaction conditions.

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“…Various catalysts have been employed including platinum, palladium, copper and palladium on activated carbon, diatomite, etc. [27,67,68]. Under this condition, the hydrogen molecule is adsorbed on the catalyst surface where it is dissociated into hydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

Production of low trans-fatty acid margarine by Plasma Hydrogenation

Puprasit

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Margarine is a widely used raw material in the food and bakery industry. A successfully novel technique for refined palm olein�hydrogenation to free�trans-fat margarine production using non-thermal dielectric barrier discharge (DBD) plasma has been demonstrated. The new green method does not use chemicals as a catalyst, thus making it extremely environmentally friendly. This also performs well at room temperature and atmospheric pressure making it easier to manage. Two-electrode arrangement patterns were studied in this research: parallel plate and needle-in-tube. The results showed that using the parallel plate electrodes, 1.44%�trans-fat (was detected) and a trans-fat generation rate of only 0.07% per percent reduction in iodine, 6.12 times lower than conventional margarine production methods use chemicals as a catalyst, operated at high temperature and pressure. At the same time, the needle-in-tube electrode arrangement did not detect�trans-fats and had a higher reaction rate than the parallel-plate configuration. Zero�trans-fat is the main objective of this research study. Thus, the needle-in-tube was more suitable for margarine production by hydrogenation than the parallel-plate configuration. Production estimates were made considering only the cost of raw materials, electricity and H2�gas. The parallel-plate DBD plasma costed 1.56 USD per liter, which was 8.25 times cheaper than the needle-in-tube DBD plasma, which costed 12.87 USD per liter. Consequently, the majority of the cost was electricity. This method was compared to commercially available margarine in Thailand�priced at 2.40 4.50 USD per liter, demonstrating cost effectiveness. Moreover, the production efficiency can be improved by designing a high voltage, high-frequency power supply with lower power consumption.

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Hydrogenation of Vegetable Oils over a Palladium Catalyst Supported on Activated Diatomite

Cited by 11 publications

References 22 publications

New Stereoselective Catalysts for the Hydrogenation of Sunflower Oil

New Stereoselective Catalysts for the Hydrogenation of Sunflower Oil

Catalytic Hydrogenation of Derived Vegetable Oils Using Ion-Exchange Resin-Supported Ruthenium Nanoparticles: Scope and Limitations

Production of low trans-fatty acid margarine by Plasma Hydrogenation

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