• Mohammad Nazri Mohd Jaafar Institute for Vechicle System and Engineering (IVeSE), Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia, 81310 UTM Johor Bharu, Johor, Malaysia
  • Safiullah Safiullah Institute for Vechicle System and Engineering (IVeSE), Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia, 81310 UTM Johor Bharu, Johor, Malaysia



Rice Bran Oil Biodiesel, combustion characteristics, equivalence ratio, gaseous emission, biodiesel blends


The concept of biodiesel as an alternative fuel is not an overnight thought, but the escalating prices, pungent emission gases and non-ecological behavior of fossil fuels has constrained the researchers to take the necessary steps. Biodiesels which are renewable in nature and having environmental friendly attribute have shown the potential to be the perfect replacement for the diesel fuels. Similarly, this study demonstrates the characteristics of Rice Bran Oil (RBO) which can be used as a latent substitute for diesel products. RBO is a vegetable oil, which is extracted from the rice bran (by-product of rice grain). Since rice is the staple diet for more than half of the world population, the quantity of RBO that can be extracted is enormous.  In this study, the converted RBO into biodiesel (RBOBD) was blended with diesel to produce B5, B15 and B25 to determine physical properties and combustion performance. Owing to highly packed molecules of RBOBD, the properties such as density, kinematic viscosity and surface tension are higher in RBOBD and its blends than diesel.  In contrast, the calorific value is lower. In the combustion test, the highest wall temperature is achieved at stoichiometric fuel mixture, while among the fuels, the wall temperature decreases as the biodiesel proportion increases in the blends. Moreover, in B25, emissions such as CO and SO2 are 68% and 50% lower than that of diesel respectively. However, due to the additional oxygen present in the biodiesel structure, NOx emission of B25 is 15.67% higher than diesel.


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