Browsing by Author "Mimoun, Hadj"

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    Investigating the Effect of Novel Nanofluid Solutions (TiO2/ZnO, TiO2/Al2O3 and ZnO/Al2O3) Containing Didodecyldimethylammonium Bromide (DDAB) Surfactant on Asphaltenes Deposits
    (Springer Nature, 2024) Zahaf, Billel; Kaddour, Omar; Mimoun, Hadj
    As they constitute the heaviest and polar fraction of crude oils, asphaltenes affect undesirable precipitation issues during crude oil mining, transportation, and refining. Viscosity is one of the parameters influencing the precipitation of asphaltenes. Therefore, our research aims to reduce the viscosity of Algerian oil residues by employing a novel inhibitor based on a mixture of metal oxide nanofluids. Firstly, we determined the viscosity of asphaltenes content in oil residue as a function of the shear rate without additives, then in the presence of nanofluids of metal oxides (Al2O3, TiO2, ZnO). The viscosity measurements were carried out in solutions (pentane/toluene) containing 20 g/L of the oil residue at different proportions of metal oxide nanofluids (0 ÷ 3 wt.%). The same steps were repeated using nanofluid solutions (TiO2/ZnO, TiO2/Al2O3 and ZnO/Al2O3). The results obtained show that prepared nanofluids significantly decrease the viscosity of asphaltenic oil, hence, the separated nanofluids decrease the viscosity in this order ZnO < Al2O3 < TiO2 with corresponding viscosity reduction rate of 91.67% for TiO2, however, the effectiveness of mixed nanofluids to reduce viscosity is ZnO/Al2O3 < TiO2/Al2O3 < TiO2/ZnO for 94.67%. This study verify the implication of novel mixed nanofluid solutions for improving the flow of asphaltenic oil.
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    Optimization of the activity of Mo7-Zn3/CaO catalyst in the transesterification of waste cooking oil into sustainable biodiesel via response surface methodology
    (2024) Kouider Elouahed, Salima; Asikin-Mijan, Nurul; Alsultan G, Abdulkareem; Kaddour, Omar; Yusop, Muhammad Rahimi; Mimoun, Hadj; Samidin, Salma; Mansir, Nasar; Yap, Taufiq Yun Hin
    An enriched basic site CaO-supported bimetallic Molybdenum-Zinc (Mo7-Zn3) catalyst was successfully synthe- sized via wet-impregnation and evaluated for the transesterification of waste cooking oil into biodiesel. The physicochemical characterization of the Mo7-Zn3/CaO catalyst demonstrated good dispersion of CaMoO4 and ZnO oxides on CaO support, with a mesoporous structure allowing for better mass transfer between reactants. The Mo7-Zn3/CaO catalyst exhibited high transesterification activity (95 ± 0.3 % FAME conversion), owing to the large density of strong Brønsted basic sites (conjugated O2–) generated from simultaneous interaction among Ca2+, Zn2+, and Mo6+ metal species. Response Surface Methodology (RSM) and Box Behnken Design (BBD) were used to optimize the reaction and indeed, the utmost FAME conversion of 95 % is achieved using 3.37 wt% catalyst loading, 12:1 methanol to oil molar ratio within 2.27 h at 62.7 ◦C reaction temperature. The model reliability in predicting the FAME yield using the established catalyst under varying operational conditions was excitedly validated with a reasonable accuracy error of 0.5 %. The catalyst exhibited good stability, maintaining a high FAME conversion (95–85 %) during 5 reusable cycles without significant loss in catalytic activity. A closer look for a detailed approach and a heterogeneous mechanism for the reaction using Mo7-Zn3/CaO catalyst was proposed. The physical and chemical properties of the produced biodiesel were carefully compared with the standard for biodiesel, and were found to majorly comply with ASTM D6751 and EN 14214 biodiesel properties. An investigation into the economic competitiveness and industrial applicability of biodiesel production using Mo7-Zn3/CaO from WCO reveals significant potential for sustainable and efficient biodiesel synthe
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    Potential production of olefins in pyrolysis of Algerian gas condensate compounded with ethane
    (Springer, 2019) Bouarar, Fahima; Kaddour, Omar; Mimoun, Hadj; Khettab, Nadjia
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    Valorization of polyethylene waste by vacuum cracking
    (Taylor and Francis, 2022) Dahou, Meriem; Hammadou née Mesdour, Souad; Kaddour, Omar; Mimoun, Hadj
    In this study, polyethylene-pyrolysis was investigated under vacuum to yield cracking-oils as substitutes for petro-diesel. At 430 °C and 670 mmHg, highest yield of 86.68% liquid, 6.46% of residues and 6.86% of gas fractions were obtained. The liquid-fraction composition (180–350 °C) was dominated by paraffinic and olefin, as confirmed by GC–MS. The fuel qualities were analyzed using ASTM standards and then compared to the commercial-diesel. The depolymerized oil characteristics are similar to conventional-fuel except for the density, which was increase by adding an appropriate amount of petro-fuel. This process could significantly serves in managing wastes to produce clean-fuels