Influence of hydrogenation and antioxidants on the stability of soybean oil biodiesels

Abstract

This study examined the influence of hydrogenation and antioxidant activity of natural products derived from Mangifera indica on soybean biodiesel stability. Biodiesels were prepared with refined, semi‐refined, and partially hydrogenated soybean oil and the stability was evaluated in a Rancimat apparatus. The biodiesel from partially hydrogenated soybean oil showed greater stability (11.9 h), exceeding the standard limit established by the Brazilian National Petroleum Agency (6 h). Gallic acid, tannic acid, and mango seed kernel extract were evaluated as antioxidants. The gallic acid showed higher antioxidant ability than the other products, increasing twofold the oxidative stability (20.8 h). The results indicate the importance of mango seed as a source of efficient antioxidants for biodiesel just like gallic acid.Practical applications: The results provide detailed information about: (i) the influence of hydrogenation on soybean biodiesel stability; (ii) the antioxidant activity of natural products derived from M. indica; (iii) and the importance of each phenolic constituent on the stability. Mango seed is an abundant waste product from fruit juice industry in Brazil and could be used for obtaining an effective antioxidant additive for biodiesel.

Catalytic conversions in green aqueous media. Part 8: Partial and full hydrogenation of renewable methyl esters of vegetable oils

“…However, problems associated with the use of 1st generation biodiesel remain inter alia its low oxidative stability and low-temperature behaviour as well as its higher NO x emissions [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Partial hydrogenation reactions of polyunsaturated FAME of vegetable oils to yield their monounsaturated (C18:1) counterparts [15,16,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][122][123][124][125][126][127][128][129][130][131] without increasing the content of the saturated part, i.e. methyl stearate (MS, Scheme 1) are useful reactions for upgrading 1st generation biodiesel [15,…”

“…Sonmez et al [65] partially hydrogenated sunflower oil using heterogeneous Pd/Rhbased scrap automobile catalyst to obtain high yield in trans-C18:1, elaidic acid. Alexandrino et al [66] investigated the oxidative stability of soybean oil biodiesel and of partially hydrogenated soybean oil biodiesel obtained with heterogeneous Ni-based hydrogenation catalysts and showed that the partially hydrogenated biodiesel possesses a higher oxidative stability which makes it better suited to commercialization. Su et al [67] used heterogeneous copper oxide bi-functional catalysts supported on alkaline earth metal oxides to catalyze both the transesterification reaction of hempseed oil with methanol to yield methyl esters of hempseed oil and the partial hydrogenation reaction of the highly unsaturated methyl esters of hempseed oil to produce their C18:1 counterparts which are suitable as a biodiesel fuel.…”

“…Catalytic partial hydrogenation processes of polyunsaturated methyl esters of vegetable oils into their monounsaturated C18:1 counterparts (Scheme 1) [15,16,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][122][123][124][125][126][127][128][129][130][131] are of great interest in the fields of production of high quality 1st generation biodiesel fuel [15,16,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69]…”

Production characterization and efficiency of biodiesel: a review

“…Biodiesel from partially hydrogenated soybean oil showed greater stability (11.9 h). The gallic acid showed higher antioxidant ability than other products, increasing twofold the oxidative stability (20.8 h) . Interaction of palm biodiesel with different polymer materials has been reviewed by Lutz et al .…”

Study on palm oil hydrogenation for clean fuel over Ni–Mo–W/γ-Al 2 O 3 –ZSM-5 catalyst

“…The most widely investigated methods are transesterification [7][8][9][10], catalytic cracking [11][12][13], and hydrodeoxygenation [14][15][16][17]. Transesterification of vegetable oil with lower alcohols, which yield fatty acid methyl esters (FAMEs), is performed under mild conditions and can be considered as a mature technology.…”