Oxidative stability of biodiesel by mixture design and a four-component diagram

Viegas, Isabelle Moraes Amorim; Filho, Alex Oliveira Barradas; Marques, Edmar P.; Pereira, Claudete Fernandes; Marques, Aldaléa Lopes Brandes

doi:10.1016/j.fuel.2018.01.124

Cited by 24 publications

(4 citation statements)

References 36 publications

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“…In both cases, the sum of all molar fractions is fixed to 1. It must be underlined that five-component mixtures are seldom studied in the DoE because they require a five-dimensional space to visualize the experimental domain and to analyze the component’s effect and the model results. , To overcome this problem, the whole compositional range is usually divided into subdomains, each including a reduced number of components and separately investigated. − Several examples of this approach can be found in the literature. − We decided to avoid this approach to better appreciate the mutual interactions among all of the components present in the system.…”

Section: Methodsmentioning

confidence: 99%

“…It also allows one to understand which of the compositional variables has a more relevant effect on the properties of interest and to evaluate the extent of such an effect . Although this approach finds wide application in industry in the design of new formulations or the optimization of specific properties, − its application to the study of phase stability in complex mixtures is yet to be explored.…”

Section: Introductionmentioning

confidence: 99%

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Assessing Phase Stability in High-Entropy Materials by Design of Experiments: The Case of the (Mg,Ni,Co,Cu,Zn)O System

Coduri,

Magnaghi,

Fracchia

et al. 2024

Chem. Mater.

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In this study, we aimed to explore the phase stability of high-entropy oxides (HEOs) beyond their conventional equimolar composition, which presents the maximum configurational entropy. This task is challenging due to the large number of compositional parameters involved. We used the design of experiments as a strategy to investigate the compositional range of stability of the rock salt (RS) structure in the (Mg,Ni,Co,Zn,Cu)O quinary system, featuring the prototypical HEO Mg 0.2 Ni 0.2 Co 0.2 Zn 0.2 Cu 0.2 O. Our study revealed that the chemical nature of the RS-native oxides (NiO, MgO, and CoO) significantly affects the phase stability of the RS-HEO, suggesting that the HEO stability is not solely governed by the balance of configurational entropy and enthalpy of mixing. In addition, a single high-entropy phase can be achieved on a wide out-of-equimolar set of compositions, thereby broadening the compositional range that should be explored in the search for innovative materials with unique properties and applications.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing Phase Stability in High-Entropy Materials by Design of Experiments: The Case of the (Mg,Ni,Co,Cu,Zn)O System

Coduri,

Magnaghi,

Fracchia

et al. 2024

Chem. Mater.

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“…Low values are also commonly met in biodiesel derived from other feedstock (e.g. soybean and corn; less than 5.1 h) [35]. In addition, the cooking/frying process has a negative impact on the oxidation stability of the final product.…”

Section: Uco Samples Converted At Elin Laboratoriesmentioning

confidence: 99%

Quality Characteristics of Biodiesel Produced from Used Cooking Oil in Southern Europe

et al. 2019

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The potential of households’ used cooking oil (UCO) recycling for biodiesel production is massive. This study aims to promote the shift from UCO inappropriate disposal to sustainable recycling. UCO is classified as municipal waste under the code 20 01 25 (edible oils and fats), according to the European Waste Catalogue. Inappropriate UCO disposal increases the operating cost of wastewater treatment, the risk of groundwater contamination, as well as the greenhouse gas emissions that are associated with its biodegradation. Recycling UCO-to-biodiesel offers a sustainable solution in the exploitation of a problematic waste and its transformation into an energy resource, thus contributing to the reduction of environmental pollution and fossil fuel dependence. This paper includes critical recommendations in order to overcome bottlenecks to successfully promote the UCO-to-biodiesel chain. Quality control of the biodiesel—produced exclusively from UCO—was performed according to the European Standard EN 14214 and the results are presented in the paper. The analysis studies the outcomes from four Southern European countries (Spain, Portugal, Italy, and Greece), which hold the top four places in annual per capita olive oil consumption in the European Union (EU).

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“…Bondioli et al (1995) and Thompson et al (1998) investigated the degradation behaviour of rapeseed oil methyl esters (RME) under different storage conditions; all oxidative actions such as acid value, peroxide value, and viscosity increased with time in storage. Viegas et al (2018) and Simkovsky and Ecker (1999) investigated the interrelationship between oxidative biodiesel stability and natural antioxidant tocopherol. The rate oxidation of fatty acid methyl ester compounds depends on the number of double bonds and their position in the fatty acid linear chain structure (Frankel 2014).…”

Section: Introductionmentioning

confidence: 99%

Abiding effects of phenolic antioxidants on oxidative behaviour of fatty acid methyl esters derived from waste cooking oil

Hossaina

Sujan

Jamal

et al. 2021

BioRes

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Fatty acid alkyl esters (FAMEs) derived from waste vegetable oils and non-edible oil sources are the most attractive alternative liquid biofuel in the energy field. Substitute methyl esters derived from waste cooking oil (WCO) have a lower induction period (3.12 h) and do not satisfy the Biodiesel EN 14214:2012 Standard (8 h). In this study, concentrations of 100, 250, 500, and 1000 ppm of four different types of phenolic antioxidants—butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), tert-butyl hydroquinone (TBHQ), and propyl gallate (PG)—were used to examine oxidative stability and improve fuel quality. PG (250 ppm) showed the most effective result of 18 h to 12.17 h of the induction period of 6 months of storage. Antioxidant effectiveness increased with regard the oxidative stability of waste cooking oil methyl ester in the following order: BHT <TBHQ < BHA< PG. Acid value and kinematic viscosity of WCO biodiesel increase 564.3% and 10.3% respectively, which indicate degradation of fuel quality. But biodiesel with antioxidant, all the parameters changes dynamically. The acid value, kinematic viscosity, and density of all investigated samples increased. All results were within limits of EN 14214:2012 standard speciﬁcation for the 6 months of storage period.

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Oxidative stability of biodiesel by mixture design and a four-component diagram

Cited by 24 publications

References 36 publications

Assessing Phase Stability in High-Entropy Materials by Design of Experiments: The Case of the (Mg,Ni,Co,Cu,Zn)O System

Assessing Phase Stability in High-Entropy Materials by Design of Experiments: The Case of the (Mg,Ni,Co,Cu,Zn)O System

Quality Characteristics of Biodiesel Produced from Used Cooking Oil in Southern Europe

Abiding effects of phenolic antioxidants on oxidative behaviour of fatty acid methyl esters derived from waste cooking oil

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