Effect of Synthetic and Aromatic amine antioxidants on physiochemical properties with Moringaolefera biodiesel blends

Abstract

Stability of biodiesel is an important parameter for biodiesel users in worldwide due to the
increasing transportation system. The present study focused is on the effect of antioxidants
(synthetic and aromatic) addition on Moringaolefera biodiesel. The changes in physicochemical
properties were observed for both synthetic and aromatic amine antioxidants. In
this study, two aromatic antioxidants N, N′-diphenyl-1, 4-phenylenediamine (DPPD) and Nphenyl-
1, 4-phenylenediamine (NPPD) and three synthetic antioxidants butylatedhydroxy
toluene (BHT), tert-butylhydroxyquinone (TBHQ) and diphenylamine (DPA) were used. Due
to the addition of both antioxidants to moringa biodiesel, the rate of change of kinematic
viscosity and density were less compare to pure biodiesel. The addition of antioxidants with
biodiesel, oxidation stability of biodiesel increased significantly. It was also found that, for
higher blends aromatic amine antioxidants (AAAO) shows better oxidation stability (OS) and
for lower blends synthetic antioxidants (SAO) shows better OS. However in some rare cases
may act pro-oxidants. The outcome showed that by adding all the antioxidants to diesel fuel
blends affected most of the crucial fuel properties.