Browsing by Author "Pemanos Yelda, Bakoz"

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Carbone nanospheres synthesis by pyrolysis of crude oil and optimization of parameters growth by response surface methodology (RSM)
(Applied Chemistry, 2015) Boufades, Djamila; Pemanos Yelda, Bakoz; Mousidene, Anissa; Benmebrouka, Hafsa; Doumandji, Lotfi; Hamada, Boudjema
Algerian oil as a new source of carbon is used to prepare the carbon nanospheres (CNSs) by pyrolysis method. A mixture of crude oil and FeCl3.6H2O solution as catalyst was injected into the reaction furnace to produce CNSs in an inert atmosphere, followed by multi step purification to remove different impurities. The carbon nanospheres have been characterized by scanning electron microscopy (SEM), energy dispersive X-rays spectroscopy (EDAX), X-ray diffraction(XRD), Raman spectroscopy and FTIRspectrum. The SEM image reveals that these CNSs have smooth surfaces and uniform particles with a diameter lower than 500 nm. the XRD and Raman studies shows that the graphitization degree of CNSs is not high , while the EDAX analysis shows that more than 98 % of the CNSs is carbon, FTIR proved the presence of new functions after samples treatment such as acid function. This study reports the optimization of various process parameters such as, temperature of reaction (860-940°C), process Time (90-150min)and mass ratio catalyst/Crude oil (0.83 10-3-2.4810-3 g/g) for increasing the Yield of CNSs. A MODDE 6.0 experimental design was employed for the optimization of synthesis of crude oil to ensure high production of carbon nanospheres in a low catalyst concentration and high temperature for a short length of time. The analysis of variance showed a high coefficient of determination value (R2 = 0.965) and Maximum CNSs production was predicted and experimentally validated, the optimized process conditions were identified to be reaction temperature of 900°C, duration synthesis of 113min and mass ratio catalyst /crude oil of 0.8 10-3 g/g with a yield of 13.23%
Synthesis of a biobased antioxidant additive for diesel fuel
(2014) Hamada, Boudjema; Zourane, Tinhinane; Pemanos Yelda, Bakoz; Chikh, Sabrina
In this study, our objective is to synthesize a biobased antioxidant additive for Diesel fuel during the storage. Our choice was made particularly on the olive oil as raw material because of its oleic acid content which is more to 75%. The processes involved were epoxidation of oleic acid of the olive oil, opening of the oxirane ring, and esterification. The structures of the products were confirmed by FTIR. To test the effectiveness of our biobased antioxidant additive, we carried out Accelerated Oxidation Test – AOT on diesel without additive (blank) and diesel with additive with various concentrations: 2000,4000 and 6000 ppm. The oxidative degradation of diesel with or without antioxidants was investigated by UV-visible spectroscopy was used to monitor the changes using peroxide value. A remarkable stability of diesel with antioxidant additive comparing with the blank confirms the inhibition of the oxidation phoneme and thus of the good efficiency of antioxidant additive from the optimal concentration of 2000ppm