Browsing by Author "Boufades, Djamila"

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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%
Extractive dearomatization, denitrification and desulfurization of gas oil fractions by a mixed extractant of N,N-methylpyrrolidone, N,N-dimethylformamide and ethylene glycol via microwave radiations
(Taylor & Francis, 2019) Mesdour, Souad; Boufades, Djamila; Moussiden, A.; Hamada, B.
In an attempt to develop alternative process that meet the prescribed levelsand green-technology criteria in gas-oil refining, N,N-methylpyrrolidone(NMP), dimethylformamide (DMF) mixed solvents under microwave-radiations (MW) were tested for the gas-oil desulfurization (EDS), denitrifica-tion (EDN) and dearomatization (EDA). In optimal conditions the gas-oilEDS-efficiency via MW can reach as high as 99.1% within 5 min at 500W inthree stages, which is much higher than EDS without MW (88.5% within15 min) or than those of ionic liquids. The NMP/DMF/EG can be reused formulti-cycles before being regenerated by adsorption method. This study willprovide useful information for future industrial application
One-step synthesis and characterization of carbon nanospheres via natural gas condensate pyrolysis
(Taylor and Francis, 2020) Boufades, Djamila; Hammadou Née Mesdour, Souad; Moussiden, Anissa; Benmebrouka, Hafsa; Hérold, Claire; Kaddour, Omar
In the current work, carbon nanospheres (CNSs) were prepared via pyrolysis of gas condensate in N2 at 1273 K and atmospheric pressure for 2 h using ferric chloride as a catalyst precursor. X-ray diffraction, energy dispersive X-ray spectrometry (EDX) in scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometry (Raman), Fourier transform infrared spectroscopy, and thermal gravimetric analysis (TGA) are employed for the structural and morphological characterization of the nanomaterials formed. The conductivity of these films was measured using the four probe method. As results, SEM-EDX and TEM analysis reveal spherical shaped particles, with diameter varying between 100 and 200 nm and graphene interlayer distance of 0.339 nm. The very low ID/IG ratio obtained reveals a relatively low amount of disorder in the nanostructures and TGA analysis implies that thermal stability was achieved after 470 °C. Our work provides a simple synthetic strategy in one-step sample preparation of CNSs, which can be used for furfur applications such as high-performance supercapacitors or adsorbents
Optimization of hydrolysis degradation of neurotoxic pesticide methylparathion using a response surface methodology ( RSM )
(IOSR Journal of Applied Chemistry (IOSR - JAC), 2015) Doumandji, Lotfi; Moussiden, Anissa; Benmabrouka, Hafsa; Boufades, Djamila; Zaher, Ihdene; PemanosYelda, Bakos; Hamada, Boudjema
Optimization of carbon nanotubes synthesis via pyrolysis over Ni/Al2O3 using response surface methodology
(Taylor and Francis Online, 2021) Boufades, Djamila; Hammadou Née Mesdour, Souad; Moussiden, Anissa; Benmebrouka, Hafsa; Medjahdi, Ghouti; Kaddour, Omar
Owing to the rapid expansion of preparing a low-cost and pure carbon nanotubes (CNTs) from large available raw materials as cheap carbon precursors and catalyst depositions via chemical vapor deposition process, Algerian condensate gas over Ni/Al2O3 was used in this study. Response surface methodology was utilized to assess and optimize the preparation parameters. Synthesis of CNTs was studied as a function of three independent parameters: catalyst/condensate-gas weight ratio (5–10 wt %), synthesis time (30-120 min) and temperature (700–1000 C). Optimum conditions for the CNTS-synthesis were found to be 5%, 112 min and 1000 C, for catalyst/condensate gas mass ratio, synthesis time and temperature, respectively. Under these conditions, Raman spectrum indicates high values of (IG/ID), which means high-quality CNTs. Examination by SEM and HRTEM revealed that the CNTs grown under optimum conditions had diameters of 10nm. The carbon yield predicted at the optimum process conditions was 81.76%. Conclusively, the pure and uniformed CNTs can be produced with high yield by the conversion of available-cheap resources via CVD-method. This method is practical, realistic, feasible in industrial scale and thus can reduces the cost manufacture of CNTs, which may help increase the impact of these remarkable materials in many fields.
Process Parameters and Intensification Effects of a Microwave Exposure Applied for the Extractive Oxidation of Diesel: An Optimization Using Response Surface Methodology
(Pleiades Publishing, 2024) Bedoud, Karim; Mesdour, Souad Hammadou née; Boufades, Djamila; Moussiden, Anissa; Benmabrouka, Hafsa; Hamada, Boudjema; Kaddour, Omar
Extractive oxidation of diesel via microwave processing using sulfuric acid and two synthesized pyridinium- or methylpyridinium-based ionic liquids has been studied as a sustainable and clean technology. The Central Composite Design (CCD) representing one of the response surface methods was applied for the experimental design, mathematical modeling, optimization, and factor-influence study, which covered the 0.75–1.75 [CH2COOHmPy][HSO4]/[H2SO4] volumetric range, 40–80°C temperature range, and 120–300 s radiation exposure time. The developed model properly fitted experimental results, with a coefficient of determination (R2) equal to 0.9832 that indicated its accuracy. The highest predicted sulfur removal (93.338%) as well as a significant removal of nitrogen and aromatic compounds was obtained for [CH2COOHmPy][HSO4]/[H2SO4] = 1.57, T = 71.7°C, and exposure time equal to 208 s. Microwave-assisted extractive oxidation demonstrated a considerable potential as the energy-saving technology, which meets the future need for producing clean fuels with low content of heteroatoms and polyaromatic hydrocarbons.
Synthèse des nanosphères de carbone par pyrolyse du pétrole brut et optimisation de processus. Applications
(2015) Boufades, Djamila
L'objectif de cette étude consiste à élaborer les nanosphères de carbone en utilisant le pétrole brut comme source de carbone par le procédé de pyrolyse catalytique et en maîtrisant les principaux paramètres de croissance de ces matériaux pour augmenter son rendement , les échantillons bruts de NSC peuvent contenir des impuretés telles que du carbone désordoné, des polyaromatiques et des résines et des particules métalliques résiduelles, une étude de purification a donc été menée pour les utiliser dans de nombreux domaines tels que l'adsorption des composés soufrés dans le carburant diesel et l'application comme additif antioxydant des huiles lubrifiantes pour moteurs. Dans un premier temps, nous avons synthétisé les NSC en utilisant le pétrole brut comme source de carbone et le FeCl3.6H2O comme catalyseur , après la synthèse , Les nanosphères de carbone ont été caractérisées ensuite par électronique microscopie à balayage (MEB), spectroscopie de dispersion d'énergie des rayons X (EDAX), diffraction des rayons X (XRD), spectroscopie Raman . L'image de MEB montre que ces NSCs ont des surfaces lisses et des particules uniformes sous forme des agrégats avec un diamètre inférieur à 500 nm. le XRD et des études Raman montre que le degré de graphitisation des NSC s n'est pas élevé Par la suite, et pour l'optimisation de la synthèse , nous avons étudié l'influence des paramètres principaux(température, temps, rapport massique catalyseur/pétrole brut) de la réaction catalytique de formation des nanosphères de carbone à partir du pétrole brut sur le rendement en NSC . après des résultats de logiciel MODDE 6.0 , le modèle est valide avec des coefficients de corrélation(R2)et coefficient de prédiction (Q2) significatifs . Ce modèle permet de prédire le rendement des NSC en fonction des conditions expérimentales appliquées Enfin, dans une dernière partie, nous avons appliqué ces nanosphères dans la disulfuration de disel par adsorption des composés soufrés et nous avons conclu que les NSC sont des bons adsorbants ainsi ils ont été utilisés comme additifs antioxydants et les résultats ont montré une efficacité inhibitrice antioxydante élevée des nanosphères de carbone
Synthesis and functionalization of carbon nanospheres from asphaltene fraction for crude oil upgrading and viscosity reduction
(Taylor & Francis, 2024) Hammadou, Souad; Boufades, Djamila; Dahou, Meriem; Moussiden, Anissa; Boussak, Hassina; Demim, Soraya; Loucif Seiad, Linda
Nanoparticles provide a promising, cost-effective eco-friendly solution to the challenges posed by heavy-oil reservoirs, significantly enhancing oil recovery rates by reducing viscosity without requiring extensive thermal inputs. In this study, carbon nanospheres (CNSs) and functionalized-CNSs nanofluids were prepared by incorporating surfactants (T80 or BMIMCl). These nanofluids were evaluated for their efficacy in upgrading crude oil, particularly focusing on viscosity-reduction. Rheological tests were conducted across varying shear rates (60–300 s−1) and concentrations (0.02–3 wt.%) to comprehensively assess the impact of these additives on the crude oil’s proprieties. The results showed a notable enhancement in crude oil viscosity reduction, with the following order observed: CNS-TiO2 < CNS-TiO2/DMIMCl < CNS-TiO2/T80, yielding reduction rates of 95%, 95.83%, and 97.08%, respectively, at an optimal dosage of 2.75 wt.% and a shear rate of 300 s−1. The surface functionalization of CNS particles and their crystallinity are the main mechanisms driving the reduction in oil viscosity. Moreover, the properties of the crude oil were investigated upon the utilization of CNS-TiO2/T80 nanofluid. It was found that this nanofluid led to a substantial reduction in sulfur content by 78.32% and a significant decrease in the percentage of heavier molecules, ranging from C12 to C35 and up to C36, with 47.76% and 97.98%, respectively.
Valorisation de condensat par le procédé de pyrolyse
(Universite M'Hamed Bougara : Faculté des hydrocarbures et de la chimie, 2021) Boufades, Djamila; Kaddour, Omar(Directeur de thèse)
Ce travail de recherche porte sur l’élaboration et la caractérisation des nanostructures de carbones comme candidats potentiels pour diverses applications. Des nanosphères (NSC) et des nanotubes de carbone (NTC) ont été préparés à partir de condensat de gaz naturel par pyrolyse en présence des catalyseurs à base de fer et de nickel. La pyrolyse a été mené à des température modérées sous un atmosphère d’azote et les deux approches d’élaboration des NSC-NTC avec des métaux de transition ont été comparées. L’obtention de tels matériaux nécessite la maitrise des paramètres expérimentaux ainsi que la nature de précurseur. Les différentes proportions catalytiques au cours de la synthèse ont été variées et leur influence sur la croissance des NTC-NSCs a été également étudiée. Ces paramètres de synthèse permettent notamment de faire varier les propriétés des nanostructures obtenues tels que le diamètre, la morphologie, la cristallinité et l’espace inter-couche. Par ailleurs, une optimisation par MODDE 13 de production des NTC en présence de Ni/Al 2 a été effectuée afin d’améliorer la qualité et la quantité des nanotubes préparés. Les résultats obtenus montrent qu’un rendement O 3 de 81.76% des NTC a été atteint à une température de 1000 ° C durant 112 min avec des quantités très faibles de catalyseur (Ni/Al 2 O 3 ).
Vanadium-catalyzed extractive oxidesulfurization of commercial diesel in ionic liquid with combined oxidizing agents
(Taylor & Francis, 2019) Benmabrouka, Hafsa; Mesdour, Souad; Boufades, Djamila; Moussiden, Anissa; Berrabia, Nadjet; Tliba, Louey; Boudjema, Hamada