Comparative Study of Chalcones and Their Potential as Additives for Biofuels

Abstract

The use of fossil fuels represents a large part of the world’s energy availability. The burning of these fuels is related to several global problems. They are nonrenewable sources of energy, and therefore, there is a growing demand for new renewable fuels with less environmental impact, such as biofuels. Although there are some problems related to biofuels, such as low oxidation stability and less energy availability, additives can be used to preserve their properties. To this end, a comparative study was carried out between two chalcones that presented good values of calorific power. This study contains structural analysis, theoretical calculations, and energy analysis, in order to understand the structural differences, as well as the supramolecular arrangement and physical–chemical properties. The evaluated results can contribute to the characterization of these chalcones as potential additives and support future studies.

Aplicação de Chalconas e Análogos com Aditivos Antioxidantes em Misturas de Diesel e Biodiesel

“…Therefore, chalcones represent compounds with potential application as additives for fuels and biofuels such as biodiesel [21], [31], [32].…”

Cyclohexanone-Based Chalcones as Alternatives for Fuel Additives

“…Chalcones and their analogues are either found in plants or obtained from specific synthetic pathways and have shown numerous applications as liquid crystal materials, pH sensors, , nonlinear optical materials, , as well as their remarkable biological properties: antitumor, , anti-inflammatory, antifungal, − antibacterial, ,, and antioxidant. − Some of these properties can be related to fuel applications, such as energy efficiency or additives, − and often fuels such as ethanol and biofuels are prone to suffer from degradation and oxidation problems, mainly caused by micro-organisms − or even the lower combustion capacity, therefore, a lower energy efficiency. − …”

Insights into chalcone analogues with potential as antioxidant additives in diesel–biodiesel blends

“…In light of these facts, and as part of our ongoing work regarding the application of chalcones as antioxidant biodiesel additives, 28,29,48 in this paper, we discuss the synthesis, extensive structure characterization, oxidation stability test, and density functional theory (DFT) 49 calculations for (2 E )-3-(4-bromophenyl)-1-[4-(2-oxo-2-phenylethoxy)phenyl]prop-2-en-1-one (BCH) and (2 E )-3-(3-nitrophenyl)-1-[4-(2-oxo-2-phenylethoxy)phenyl]prop-2-en-1-one (NCH) (see structures in Fig. 1).…”

“…33,34 Some physicochemical properties, such as antibacterial, [35][36][37] antifungal, [38][39][40] and antioxidant, 28,41 are the key issue for their ability to prevent free radical-induced oxidative damage driven by substitutions in chalcone rings as a function of their chemical exibility. [42][43][44][45][46][47] In light of these facts, and as part of our ongoing work regarding the application of chalcones as antioxidant biodiesel additives, 28,29,48 in this paper, we discuss the synthesis, extensive structure characterization, oxidation stability test, and density functional theory (DFT) 49…”

“…Previous studies have shown that the addition of chalcone compounds into diesel-biodiesel blends reduces the rate of the oxidation process. 28,29 This class of avonoid intermediates is formed by two aromatic rings linked by a threecarbon bridge having a keto carbonyl group and one a,b-unsaturation, obtained from natural sources [30][31][32] or synthetic pathways. 33,34 Some physicochemical properties, such as antibacterial, [35][36][37] antifungal, [38][39][40] and antioxidant, 28,41 are the key issue for their ability to prevent free radical-induced oxidative damage driven by substitutions in chalcone rings as a function of their chemical exibility.…”