Environmentally friendly lubricants through a zero waste process

Zaccheria, Federica; Mariani, Matteo; Psaro, Rinaldo; Bondioli, P.; Ravasio, Nicoletta

doi:10.1016/j.apcatb.2015.08.032

Cited by 35 publications

(24 citation statements)

References 27 publications

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“…This prompted us to test the activity of a water resistant mixed oxide with Lewis acid activity namely SiO 2 ‐ZrO 2 . This material with a 5% ZrO 2 dispersed on silica was found to be very effective in the esterification reaction of fatty acids with polyols due to the presence of Lewis acid sites identified as isolated Zr 4+ ions in a tetrahedral configuration and to their resistance to the water formed during reaction …”

Section: Resultsmentioning

confidence: 99%

Switching Selectivity in the Hydrogen Transfer Reduction of Furfural

et al. 2018

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Supported Cu catalysts and bare inorganic oxides have been tested in the reduction of furfural to furfuryl alcohol under hydrogen transfer reaction conditions by using butanol as a donor. Bare oxides like zirconia and alumina were found to be more active than the corresponding supported catalysts and in particular high surface Zirconia gave a quantitative transformation of the aldehyde into alcohol in 2,5 h at 140 °C according to a pure Meerwein‐Ponndorf‐Verley mechanism. Competitive dehydrogenation of the alcohol formed on the surface of Cu catalysts strongly reduces their activity although selectivity to alcohols on zirconia and alumina supported catalysts keeps very high. On the other hand catalysts with a well‐defined Lewis acid character such as highly dispersed Zirconia on Silica allowed to obtain up to 64% yield in 2‐butyl‐furfuryl‐ether under the same conditions.

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Section: Resultsmentioning

confidence: 99%

Switching Selectivity in the Hydrogen Transfer Reduction of Furfural

et al. 2018

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“…This is in agreement with the acidic character of these materials, often shown by our group. In particular we reported on the relevant activity and robustness of SiZr 4.7 in the esterification of fatty acids with methanol [24] or with polyols [25–26]. …”

Section: Resultsmentioning

confidence: 99%

Selective synthesis of thioethers in the presence of a transition-metal-free solid Lewis acid

Santoro¹,

Mariani²,

Zaccheria³

et al. 2016

Beilstein J. Org. Chem.

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The synthesis of thioethers starting from alcohols and thiols in the presence of amorphous solid acid catalysts is reported. A silica alumina catalyst with a very low content in alumina gave excellent results in terms of both activity and selectivity also under solvent-free conditions. The reaction rate follows the electron density of the carbinol atom in the substrate alcohol and yields up to 99% and can be obtained for a wide range of substrates under mild reaction conditions.

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“…Most of above listed difficulties can be avoided by the use of heterogeneous catalyst. In literature, we can be find many of specific and effective catalysts used in the synthesis of polyol fatty acid esters, in particular acidic Zr, Al, Si mixed oxides, superacids, and heteropolyacids . Heterogeneous catalysts are characterised by several advantages.…”

Section: Introductionmentioning

confidence: 99%

“…In literature, we can be find many of specific and effective catalysts used in the synthesis of polyol fatty acid esters, in particular acidic Zr, Al, Si mixed oxides, superacids, and heteropolyacids. [38][39][40][41][42][43] Heterogeneous catalysts are characterised by several advantages. Unfortunately, economically acceptable uses of heterogeneous catalysts require their recovery and reuse.…”

Section: Introductionmentioning

confidence: 99%

Tribological characterisation of plant oil derived fatty acid esters of higher polyols: Comparative experimental study

Nowicki

Drabik

Woszczyński

et al. 2019

Lubrication Science

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In this paper, we present the study on the synthesis, physico‐chemical, and tribological characterisation of selected plant‐derived fatty acids esters of higher polyols. We described here more effective method synthesis of desired esters with high yields and high selectivities. In our novel and improved synthesis protocol, we applied homogeneous Sn catalysts. Physico‐chemical characterisation and lubricating properties of synthesised esters have been determined and discussed. Our results showed that the synthesised esters are characterised by excellent viscosity, good low temperature, and lubrication properties. High thermal resistance is the main benefit of synthesised esters. For fatty acid esters of trimethylolpropane dimer, onset temperatures are around 400°C and decomposition temperatures above 460°C, which makes these esters applicable in higher temperature.

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Environmentally friendly lubricants through a zero waste process

Cited by 35 publications

References 27 publications

Switching Selectivity in the Hydrogen Transfer Reduction of Furfural

Switching Selectivity in the Hydrogen Transfer Reduction of Furfural

Selective synthesis of thioethers in the presence of a transition-metal-free solid Lewis acid

Tribological characterisation of plant oil derived fatty acid esters of higher polyols: Comparative experimental study

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