Hydrogenation of soybean oil over various platinum catalysts: Effects of support materials on trans fatty acid levels

Ultrasound-assisted sequentially precipitated nickel-silica catalysts and its application in the partial hydrogenation of edible oil

Sequentially precipitated Mg-promoted nickel-silica catalysts with ageing performed under various ultrasonic intensities were employed to study the catalyst performance in the partial hydrogenation of sunflower oil. Results from various characterisation studies showed that increasing ultrasonic intensity caused a higher degree of hydroxycarbonate erosion and suppressed the formation of Ni silicates and silica support, which improved Ni dispersion, BET surface area and catalyst reducibility. Growth of silica clusters on the catalyst aggregates were observed in the absence of ultrasonication, which explained the higher silica and nickel silicate content on the outer surface of the catalyst particle. Application of ultrasound also altered the electron density of the Ni species, which led to higher activity and enhanced product selectivity for sonicated catalysts. The catalyst synthesised with ultrasonic intensity of 20.78 Wcm^-2 achieved 22.6% increase in hydrogenation activity, along with 28.5% decrease in trans-C18:1 yield at IV = 70, thus supporting the feasibility of such technique.

Reduction of trans fatty acids in hydrogenated soybean oil using Ni/TiO2 catalysts

The effects of the support on the catalytic performance of supported Ni catalysts for the hydrogenation of soybean oil were examined. The turnover frequency (TOF) for Ni/TiO₂ was greater than those for other Ni catalysts. Among the examined Ni catalysts, the Ni/TiO₂ catalysts were effective for the reduction of trans fatty acid (TFA) levels (minimum 10.5%) in hydrogenated oils at an iodine value (IV) of 70, independent of the difference in the crystalline structure of TiO₂. In addition, the oils hydrogenated by Ni/TiO₂ had suitable properties for feedstock of margarine and vegetable shortening. The highly dispersed Ni nanoparticles formed by reduction of the NiO monolayer on the surface of TiO₂ contribute to increasing the catalytic activity and to reducing the TFA levels.

Facile hydrogenation of cinnamaldehyde to cinnamyl ether by employing a highly re-usable “dip-catalyst” containing Pt nanoparticles on a green support

We report the fabrication of a ‘dip-catalyst’ based on Pt nanoparticles on jute stalks as a green support and its catalytic application in cinnamyl alkyl ether synthesis.

BiOBr-photocatalyzedcis–transisomerization of 9-octadecenoic acids in different atmospheres

Investigating systematically BiOBr photocatalyzed oleic acid isomerization in different (air, N₂, and O₂) atmospheres and thecis–transisomerization mechanism for the first time.

Comparative hydrogenation of the sunflower oil on platinum and nickel catalysts

The paper considers the diatomite-supported platinum catalyst (1.0 wt% Pt/D) synthesized using colloid adsorption method. The catalyst was characterized by X-ray diffraction, N2 adsorption (BET), scanning electron microscopy and transmission electron microscopy. The activity of the platinum catalyst was investigated by sunflower hydrogenation at 0.5 MPa hydrogen pressure at temperature range from 90°C to 130°C and compared to a commercial Ni catalyst. All of the hydrogenation reactions were terminated at iodine value between approximately 72-86. The results demonstrated that Pt/diatomite catalyst exhibited the highest activity and selectivity at low temperature than the Ni catalyst in hydrogenation processes. Physical characteristics of hydrogenated products such as melting point and solid fat content were also examined.