Monitoring free radicals formation in the biodiesel oxidation reaction via electronic paramagnetic resonance

Mantovani, Ana Carolina Gomes; Chendynski, Letícia Thaís; Salviato, Aroldo; Borsato, Dionísio; Santana, Vinícius T.; Mauro, Eduardo Di

doi:10.1016/j.fuel.2018.03.114

Cited by 20 publications

(9 citation statements)

References 20 publications

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“…1. Its main features are the free radical (FR) peak at g = 2.0030 with a width of approximately 6 G, and the asymmetric octet of the 51 V splitting in the VO 2+ porphyrin molecule. (See [53] and references therein for a detailed discussion of the vanadyl EPR spectrum).…”

Section: Reference Epr Spectramentioning

confidence: 99%

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Quantifying Crude Oil Contamination in Sand and Soil by EPR Spectroscopy

et al. 2021

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Crude oil frequently contains stable radicals that allow detection by means of EPR spectroscopy. On the other hand, most sands and soils possess significant amounts of iron, manganese or other metallic species that often provide excessively broad EPR signatures combined with well-defined sharp features by quartz defects. In this study, we demonstrate the feasibility to identify oil contamination in natural environments that are subject to oil spillage during production on land, as well as beachside accumulation of marine oil spillage. Straightforward identification of oil is enabled by the radical contributions of asphaltenes, in particular by vanadyl multiplets that are absent from natural soils. This potentially allows for high-throughput soil analysis or the application of mobile EPR scanners.

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Section: Reference Epr Spectramentioning

confidence: 99%

“…The EPR signature of crude oils has been employed for characterization [48], but also for signal enhancement of the remaining maltenes by exploiting the Dynamic Nuclear Polarization (DNP) effect [49]. Related research has been carried out on marine diesel as an important oil byproduct [50,51].…”

Section: Introductionmentioning

confidence: 99%

Quantifying Crude Oil Contamination in Sand and Soil by EPR Spectroscopy

et al. 2021

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“…Biodiesel stability is totally correlated to the raw material used for its production, since unsaturated fatty acids are more likely to oxidize when compared to saturated compounds (Chendynski et al, 2019;Knothe, 2007;Knothe and Steidley, 2018;Mantovani et al, 2018). The biodiesel oxidative stability is one of the main concerns about this biofuel.…”

Section: Introductionmentioning

confidence: 99%

Ferritin and Free Radicals Species in Seeds by Electron Paramagnetic Resonance

Valezi

Mantovani

Constante

et al. 2021

EUR J SUSTAIN DEV RES

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Biodiesel is a relevant source of renewable energy which has received a lot of attention due to the need to create a renewable fuel matrix. An important source of raw material for the biodiesel production is oilseeds. Considering the lack of studies characterizing magnetic species present in seeds, different types of oilseed samples were characterized and compared using X-band Electron Paramagnetic Resonance spectroscopy, at room temperature and 30 K. It was identified the presence of the semiquinone radical in all seed's samples. Besides the free radical resonance, the presence of ferritin was observed, that is an important Fe complex present in seeds and plants, which, although very studied, still lacks a precise description related with its storage and other processes. This study can potentially assist future research about biodiesel and other products that have seeds as raw material.

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“…Nowadays, there are increasing numbers of countries encouraging the use of biodiesel to have the unprecedented potentiality for endurable energy application in the future [3]. Currently, there are some effective methods [4] that have been widely applied to the generation of biodiesel resources.…”

Section: Introductionmentioning

confidence: 99%

Strontium Oxide Deposited onto a Load-Bearable and Porous Titanium Matrix as Dynamic and High-Surface-Contact-Area Catalysis for Transesterification

et al. 2018

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Strontium oxide (SrO) deposited onto a porous titanium (Ti)-based scaffold (P-Ti) is a promising and novel approach for high-throughput transesterification. Notably, a highly porous and calcinated scaffold provides a load-bearable support for a continuous process, while the calcinated SrO catalyst, as it is well distributed inside the porous matrix, can extend its surface contact area with the reactant. In this work, the formation of transesterification reaction with the conversion and production of olive oil to biodiesel inside the porous matrix is particularly examined. The as-designed SrO-coated porous titanium (Ti)-based scaffold with 55% porosity was prepared via a hydrothermal procedure, followed by a dip coating method. Mechanical tests of samples were conducted by a nanoindentator, whereas the physical and chemical structures were identified by IR and Raman Spectroscopies. The results implied that SrO catalysts can be firmly deposited onto a load-bearable, highly porous matrix and play an effective role for the transesterification reaction with the oil mass. It is promising to be employed as a load-bearable support for a continuous transesterification process, such as a process for batch or continuous biodiesel production, under an efficient heating source by a focused microwave system.

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Monitoring free radicals formation in the biodiesel oxidation reaction via electronic paramagnetic resonance

Cited by 20 publications

References 20 publications

Quantifying Crude Oil Contamination in Sand and Soil by EPR Spectroscopy

Quantifying Crude Oil Contamination in Sand and Soil by EPR Spectroscopy

Ferritin and Free Radicals Species in Seeds by Electron Paramagnetic Resonance

Strontium Oxide Deposited onto a Load-Bearable and Porous Titanium Matrix as Dynamic and High-Surface-Contact-Area Catalysis for Transesterification

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