The determination of the activation energy of diesel and biodiesel fuels and the analysis of engine performance and soot emissions

Soto, Felipe; Alves, Márcio José Martins; Valdés, Juan Carlos Vega; Armas, Octavio; Crnkovic, Paula Manoel; Rodrigues, Gustavo; Lacerda, André; Melo, Laura Mageste de

doi:10.1016/j.fuproc.2018.02.008

Cited by 39 publications

(10 citation statements)

References 30 publications

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“…The results of the thermal analysis are shown in Figs and (TGA and DTG profiles). As observed for other biodiesel samples in the literature, there were three different stages during thermal–oxidative degradation (Soto et al, ; Szabados and Bereczky, ): a first stage with a slight weight loss (up to 200 °C), where water and some low‐temperature volatiles are released; a second one, with considerable weight loss (between 200 and 260 °C), where the main compounds derived from oxidation are evolved; and finally, a third stage (from 260 to 400 °C) due to the degradation of impurities (Dou et al, ; Soto et al, ). As can be observed, the use of antioxidants delayed the thermal–oxidative degradation of the biodiesel.…”

Section: Resultsmentioning

confidence: 71%

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Nogales-Delgado

Martín

Cabanillas

et al. 2019

J Americ Oil Chem Soc

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Biodiesel is an alternative to mineral fuels, with advantages such as biodegradability. However, this makes biodiesel unstable to oxidation. In this way, the use of natural or synthetic antioxidants is necessary. Although many studies have paid attention to the effect of these antioxidants on oxidation stability, not much literature about their effect of them on other properties (before and during storage) was found. The aim of this research study was to characterize biodiesel from corn and sunflower by adding two antioxidants, butylated hydroxyanisole (BHA) and tertbutylhydroquinone (TBHQ), in order to improve its oxidation stability. Moreover, the effect of oxidation on the parameters of biodiesel was studied by using extreme oxidation conditions to accelerate the oxidation process. Both antioxidants improved the oxidation stability of biodiesel, whereas some parameters were altered (viscosity and acid number), which could make this biofuel, if high concentrations of antioxidants are used, unsuitable for commercialization according to standards.Keywords BHA Á TBHQ Á Oxidation stability Á Viscosity Á Thermal analysis Á Fatty acid methyl esters J Am Oil Chem Soc (2020) 97: 201-212.

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Section: Resultsmentioning

confidence: 71%

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Nogales-Delgado

Martín

Cabanillas

et al. 2019

J Americ Oil Chem Soc

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“…[1][2][3][4] The firstgeneration bio-diesel, mainly consisting of fatty acid methyl esters (FAMEs), is produced by transesterification of animal or vegetable oils with methanol in the presence of base or acid catalysts. [5][6][7] Despite high cetane number and low sulfur, FAMEs are not fully compatible with existing combustion engines related to other poor properties, that is, low heating value, instability, high viscosity, and acidity. The origin is mainly resulted from high oxygen content and unsaturated bonds in the molecular structure of FAMEs, which imposes great restriction on their wide application as high-grade liquid fuels.…”

Section: Introductionmentioning

confidence: 99%

“…With the increasing depletion of fossil fuels and environmental impacts, bio‐diesel is expected to be a desirable alternative energy for fossil fuels because of its environmental friendliness and renewability 1‐4 . The first‐generation bio‐diesel, mainly consisting of fatty acid methyl esters (FAMEs), is produced by trans‐esterification of animal or vegetable oils with methanol in the presence of base or acid catalysts 5‐7 . Despite high cetane number and low sulfur, FAMEs are not fully compatible with existing combustion engines related to other poor properties, that is, low heating value, instability, high viscosity, and acidity.…”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of fatty acid methyl esters and simultaneous products isomerization over bimetallic Ni‐Co / SAPO ‐11 catalysts

et al. 2021

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Bimetallic Ni-Co/SAPO-11 catalysts were prepared and investigated for hydrodeoxygenation (HDO) of fatty acid methyl esters (FAMEs) and sequential isomerization of the products in a continuous fixed-bed reactor. The physicochemical properties of the catalysts were characterized by means of N 2 adsorption-desorption, temperature-programmed reduction of H 2 , temperature-programmed desorption of NH 3 , infrared spectra of adsorbed pyridine, and thermogravimetry. The conversion of FAMEs and selectivity of C 15-18 are enhanced over the bimetallic Ni-Co/SAPO-11 catalysts compared with that of the corresponding monometallic counterparts, which is attributed to the modification effect by Co species. The balance between metal Ni and Co and the acidity of the support plays an important role in the catalytic performance. The Ni-Co/SAPO-11 catalysts with composition of 3% Ni and 6% Co exhibit optimal catalytic performance, specifically the conversion of FAMEs, selectivity of C 15-18 , and isomerization ratio of C 15-18 , respectively, reaching 100.0%, 93.0%, and 36.1% at 400 C and 1

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“…Many of the approaches used to approximate the autoignition delay are based on Arrhenius correlation and have been proposed in the case of using Diesel fuel [10], but in the case of using Biodiesel fuel there is still a lack of theoretical information. By exception, one formula [11] could be relevant, as its form was properly adjusted as following: in which C, a, b, c are constants, -, p is the in-cylinder mean pressure, atm, Φ is the equivalence ratio, -, C n is the length of the carbon chain, -, E A is the activation energy, kcal/mol, R M is the gas universal constant (1,987×10 -3 kcal/(mol•K)) and T is the in-cylinder mean temperature, K. A particular concern is the calculation of the activation energy, with different values when the fuel content varies [12].…”

Section: Introductionmentioning

confidence: 99%

On the assessment of autoignition delay for Diesel fuel and Biodiesel B20

2018

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The use of bio-fuels is a necessity nowadays, regulated by European legislation, which imposes to the EU-countries an increase in the substitution rate of classic fossil Diesel fuel. Biodiesel (B) fuel proves to be a reliable agent to fulfil this requirement, but a certain number of aspects have to be ameliorated regarding the compatibility of this kind of fuel with the existent compression ignition engines. One of these problems relies on the autoignition delay, on which the research results are still dispersed. The paper proposes an analysis of this autoignition delay when using a compression ignition (CI) engine fuelled with Diesel fuel and with blends of Diesel and Biodiesel fuels (B20 – 20% volumetric fraction of Biodiesel), starting from several correlations given by the literature, which are based on single-cycle analysis and application of the integral Livengood-Wu method. The obtained results offer an image of the in-cylinder processes complexity and of the B20 fuel behaviour related to the tested engine operation.

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The determination of the activation energy of diesel and biodiesel fuels and the analysis of engine performance and soot emissions

Cited by 39 publications

References 30 publications

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Hydrodeoxygenation of fatty acid methyl esters and simultaneous products isomerization over bimetallic Ni‐Co / SAPO ‐11 catalysts

On the assessment of autoignition delay for Diesel fuel and Biodiesel B20

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