Quantitation of Aging Products Formed in Biodiesel during the Rancimat Accelerated Oxidation Test

2014 ◽  
Vol 28 (9) ◽  
pp. 5849-5856 ◽  
Author(s):  
Stephanie Flitsch ◽  
Philipp Marco Neu ◽  
Sigurd Schober ◽  
Norbert Kienzl ◽  
Jörg Ullmann ◽  
...  
Keyword(s):  
Accelerated Oxidation ◽  
Oxidation Test

scholarly journals Effect of the natural antioxidant eugenol on quality preservation of commercial biodiesels produced with soybean oil or waste frying oil during storage at different temperatures

2018 ◽  
Vol 40 ◽  
pp. 61
Author(s):  
Eliane Ferreira de Souza ◽  
Talita Cuenca Pina Moreira Ramos ◽  
Mikaelly Nayara Santos ◽  
Juliana Rodrigues Ferraz ◽  
Margarete Soares da Silva ◽  
...  
Keyword(s):  
Soybean Oil ◽  
Oxidation Stability ◽  
Oxidative Degradation ◽  
Acid Number ◽  
Natural Antioxidant ◽  
Waste Frying Oil ◽  
Antioxidant Efficiency ◽  
Accelerated Oxidation ◽  
Oxidation Test ◽  
Rancimat Method

The objetive of this study was to evaluate the eugenol antioxidant efficiency on the oxidation stability of commercial biodiesel synthesized from soybean oil (SB) and wast fring oil (ORB) by determining induction period (IP) and acid number (AN) during storage at 10 °C or in accelerated oxidation test at 85 °C. For the oxidation stability evaluation, the Rancimat method (EN 14112) and AN (ASTM D664) analyses were used. The initial studies showed that the antioxidants eugenol and TBHQ when added separately increased IP values for the two types of biodiesel analyzed. During the storage at 10 °C, the IP was reduced for all samples. However, the lowest reduction percentages were for samples containing eugenol (-2.07 and -11.30% for SB and ORB, respectively). In relation to AN, the samples with the antioxidant eugenol led a greater decrease of this index, with the 10000 mg kg-1 concentration being the most efficient in the conservation of biodiesel. In the accelerated oxidation test in oven at 85 °C, pure BS presented higher susceptibility to degradation than the sample containing 10000 mg kg-1 of eugenol. In both storage studies, the eugenol natural antioxidant efficiency in the control of oxidative degradation of biodiesel becomes evident. 

Accelerated Oxidation and Corrosion Testing of Engine Coolants Using a Rotary Pressure Vessel Oxidation Test

2007 ◽  
Vol 4 (4) ◽  
pp. 100366 ◽  
Author(s):  
Fred C. Alverson ◽  
Steven L. Balfe ◽  
Anthony P. Skrobul ◽  
W. Matulewicz ◽  
S. W. Dean
Keyword(s):  
Pressure Vessel ◽  
Corrosion Testing ◽  
Accelerated Oxidation ◽  
Oxidation Test ◽  
Oxidation And Corrosion

scholarly journals Effect of Cr and Al alloying on the oxidation resistance of a Ti5Si3-incorporated MoSiBTiC alloy

2021 ◽  
Vol 40 (1) ◽  
pp. 204-213
Author(s):  
Xi Nan ◽  
Tomotaka Hatakeyama ◽  
Shuntaro Ida ◽  
Nobuaki Sekido ◽  
Kyosuke Yoshimi
Keyword(s):  
Solid Solution ◽  
Oxide Scale ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Oxide Scales ◽  
Accelerated Oxidation ◽  
Oxidation Test ◽  
Poor Oxidation Resistance

Abstract The effects of adding Cr and Al on the oxidation behavior of a Ti5Si3-incorporated MoSiBTiC alloy (46Mo–28Ti–14Si–6C–6B, at%) were investigated at 800 and 1,100°C. The addition of Cr and Al largely improved the oxidation resistance of the MoSiBTiC alloy at 800°C due to the formation of Cr2(MoO4)3 and Al2(MoO4)3 in the oxide scales. These protective molybdates mainly formed on the molybdenum solid solution (Moss) and Mo3Si phases that show poor oxidation resistance in the Cr- and Al-free alloy and consequently increased the oxidation resistance of the alloys. However, accelerated oxidation occurred on the 10Al alloy after the long-term oxidation test, suggesting that the formed oxide scale has limited protection ability. At 1,100°C, the addition of Cr and Al also enhanced the oxidation resistance to some extent by forming Cr2O3 and Al2O3 in the oxide scales.

Sign in / Sign up

Export Citation Format

Share Document