Influence of Ni/SiO2 activity on the reaction pathway in sunflower oil hydrogenation

Krstić, Jugoslav; Gabrovska, Margarita; Lončarević, Davor; Nikolova, D.; Radonjić, Vidosava; Vukelić, N.; Jovanović, D.

doi:10.1016/j.cherd.2015.05.001

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…It is on the catalyst surface that molecular hydrogen is dissociated into hydrogen atoms . The nickel catalyst is usually supported on different sources of silica and it is the commonly used catalyst because of high activity, inertness relative to the oil, availability, and low cost . The product obtained is a waxy semisolid saturated 12‐hydroxystearic acid, which has a high consistency, stability, and oxidation resistance .…”

Section: Castor Oilmentioning

confidence: 99%

Development of castor oil–based polymers: A review

Nekhavhambe

Mukaya

Nkazi

2019

J Adv Manuf & Process

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Vegetable oils are a vital commodity in the industry because of the persisting challenges encountered with the utilization of fossil fuels, specifically petroleum. Petroleum-based polymers are a part of our day to day life, thus it is of importance to find sustainable ways to produce such indispensable commodities. Although various vegetable oils have been utilized to produce polymers, castor oil surpasses other vegetable oils, as it does not compete with the food industry as it is nonedible and as it is a natural polyol and has been used for polyurethane synthesis. Because of the versatility of castor oil chemistry, polymers such as epoxies, polyamides, and polyesters can be synthesized. The review focuses on the importance of castor oil toward the synthesis of various polymers and their versatile applications. K E Y W O R D Scastor oil, castor oil chemistry, epoxy nanocomposite, polyester, polyurethane

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Section: Castor Oilmentioning

confidence: 99%

Development of castor oil–based polymers: A review

Nekhavhambe

Mukaya

Nkazi

2019

J Adv Manuf & Process

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“…The refractive index values of crude oil (1.46371) and collected samples during the hydrogenation process were measured at exactly 50.00 °C (RX-5000α, Atago) and were used to monitor the hydrogenation process [29]. The fatty acid content of the starting oil, as well as the partially hydrogenated fatty acids, was determined by gas chromatograph Trace GC Ultra, equipped with FID and TriPlus autosampler (Thermo Scientific), previously described in detail [29].…”

Section: Catalyst Preparation and Catalytic Testsmentioning

confidence: 99%

Mg-Ni supported on perlite as hydrogenation catalyst: Influence of Mg and Ni content

Radonjić

Krstić

Lončarević

et al. 2019

CI&CEQ

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Article Highlights • Broken honeycomb-like perlite structure as catalyst support • Morphological, textural, and structural characteristics of Ni and Mg influence • Correlation between reducibility and hydrogen chemisorption • Evaluation of lowest reduction temperature for catalyst preparation • Catalyst behavior due to Ni and Mg influence in hydrogenation process Abstract Use of broken honeycomb-like expanded perlite as support for magnesium modified nickel catalysts in process of partial hydrogenation of sunflower oil was studied. By the use of the precipitation-deposition method, two groups of precursors were synthesized: different Ni/SiO 2 mole ratios with constant Mg/Ni mole ratio 0.1, and different Mg/Ni mole ratios with constant Ni/SiO 2 mole ratio 0.25. Characterizations of precursors were done (scanning electron microscopy, diffuse reflectance UV-Vis, infrared spectroscopy, N 2-physisorption, temperature programmed reduction (TPR) and He-pycnometry) to determine the material differences, considering the change in morphology, structure, texture and reducibility with overall Ni and Mg content. In addition, TPR and hydrogen chemisorption were performed in order to estimate the temperature reduction range of supported precursors and the dispersion degree of nickel in reduced precursors, respectively. The interaction between Ni 2+ and perlite support was established. Different reducibility and dispersion were obtained as a function of Ni/SiO 2 and Mg/Ni mole ratios. After the precursor's reduction and paraffin oil impregnation, the obtained catalysts were tested in a sunflower oil hydrogenation reaction. Catalyst activity was monitored through the decrease of the refractive index and hydrogen consumption that gave the insight that the influence on catalyst activity represents the accessibility of triacylglycerols and not always the hydrogen determined dispersion degree.

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“…The stirring rate was 1200 rpm. An experimental procedure of hydrogenation test under laboratory conditions was described in detail in our previous paper [30].…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

“…In the last two decades, there has been a growing interest for nanosized structures in the range 1-20 nm in different fields of research [28]. This is also the size of metal particles in supported metal catalyst of new generation of nickel [19,25,[29][30][31] and precious metal hydrogenation catalysts [20,[32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Supported Nickel-Based Catalysts for Partial Hydrogenation of Edible Oils

Stanković¹,

Krstić²,

Gabrovska³

et al. 2017

New Advances in Hydrogenation Processes - Fundamentals and Applications

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Nickel-based catalysts, supported on diatomite, silica gel and perlite, with high nickel loadings, have been prepared by precipitation-deposition method. Various nickel precursor salts were used for the preparation of catalyst precursors. In the precursor state, the catalysts were characterized using nitrogen physisorption, mercury porosimetry, infrared, and X-ray diffraction spectroscopy. The reducibility of catalyst precursors was evaluated using hydrogen temperature programmed reduction. Hydrogen chemisorption and X-ray photoelectron spectroscopy measurements were performed with the aim of characterizing the chemical state of the catalyst precursors. This research was focused on the study of some major factors on the state, dispersion and reducibility of a deposited Ni 2+ phase by the combined use of mentioned experimental techniques. We have examined the influence of the nature of support and the use of modifiers on activity of nickel-based catalysts in the partial hydrogenation of sunflower and soybean oils. Nitrogen physisorption and mercury porosimetry data showed that synthesis operating conditions and pore structure of supports have a profound effect on the textural properties of catalyst precursors. The analysis of infrared and X-ray diffraction spectra showed the existence of chemical species and phases which indicate the different extent of interaction between the support and the active metal. Temperature programmed reduction study revealed that the reduction features depend on the identity of the nickel precursor salt and its interaction with the support. A stronger interaction of the supported Ni 2+ phase with support hinders the reduction of catalyst precursors. Hydrogen chemisorption results showed the presence of nickel crystallites varying from 5 to 47 nm in size. The X-ray photoelectron spectroscopy data confirmed the formation surface species with different strength of interaction and different nickel crystallite sizes. The hydrogenation results showed significant differences, depending on the support and the modifier, as well as structural characteristics of reduced catalyst precursors. The results show the importance of modifiers in the control of the activity and selectivity of the partial hydrogenation

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Influence of Ni/SiO2 activity on the reaction pathway in sunflower oil hydrogenation

Cited by 9 publications

References 31 publications

Development of castor oil–based polymers: A review

Development of castor oil–based polymers: A review

Mg-Ni supported on perlite as hydrogenation catalyst: Influence of Mg and Ni content

Supported Nickel-Based Catalysts for Partial Hydrogenation of Edible Oils

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