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    Optimization of biolipids production from Saccharomyces cerevisiae ATCC 9763 cultivated on Ampelodesmos mauritanicus (Diss) hydrolysate
    (Springer Nature, 2024) Chenah, May; Amrani, Moussa; Belaloui, Djahida; Youyou, Soraya
    This study focuses on the production of biolipids by fermentation of the yeast Saccharomyces cerevisiae ATCC 9763 on a hydrolysate of the lignocellulosic biomass of Ampelodesmos mauritanicus (Diss). The central composite design (CCD) experimental plan was used to optimize biolipids production under the following experimental conditions: the concentration of dry yeast which varied from 3 to 12 g/L, the concentration of reducing sugars in the hydrolysate (glucose equivalent) was between 6 and 20 g/L, the C/N ratio varied from 40 to 180, and the fermentation time varied from 8 to 24 h. The optimal biolipid results were 49% obtained under conditions of 3 g/L of yeast concentration, 20 g/L of glucose concentration, 180 of C/N ratio, and 24 h of fermentation time. Biolipids were characterized by gas chromatography coupled with mass spectrometry (CG/MS) and the lipid profile revealed that palmitic fatty acid is the major component produced by yeast at a level of 48.49% followed by stearic fatty acid with a level of 43.65%; this fatty acid composition is similar to that of some vegetable oils. The promising potential of lignocellulosic biomass as a fermentation medium for Saccharomyces cerevisiae ATCC 9763 to produce fatty acids and other value-added compounds has been demonstrated and the produced biolipids are a promising feedstock for biodiesel. Graphical abstract: (Figure presented.)
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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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    Efficient biodiesel production from recycled cooking oil using a NaOH/CoFe2O4 magnetic nano-catalyst: synthesis, characterization, and process enhancement for sustainability
    (Elsevier, 2024) Bousba, Dalila; Sobhi, Chafia; Zouaoui, Emna; Rouibah, Karima; Boublia, Abir; Ferkous, Hana; Haddad, Ahmed; Gouasmia, Abir; Avramova, Ivalina; Mohammed, Zighed; Pârvulescu, Vasile I.; Yadav, Krishna Kumar
    This research introduces an environmentally sustainable approach to biodiesel production, utilizing waste cooking oil (WCO) as a renewable feedstock. The focal point of this study is the synthesis and characterization of NaOH/CoFe2O4 magnetic nanoparticles, employed as an efficient catalyst for the transesterification reaction between WCO and methanol. Comprehensive analysis, including X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, magnetometry, temperature-programmed carbon dioxide and ammonia desorption, and X-ray photoelectron spectroscopy reveals nanoparticles with remarkable catalytic properties. The transesterification process catalyzed by NaOH/CoFe2O4 yields biodiesel at an impressive rate of 98.71%, complying with ASTM standards. Kinetic and thermodynamic evaluations elucidate reaction mechanisms, and density functional theory (DFT) calculations provide insights into the catalytic process. The magnetic catalyst's reusability enhances sustainability, making it a promising solution for large-scale biodiesel production, and lays the foundation for future catalyst optimization.
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    Performance, combustion and exhaust emissions characteristics investigation using Citrullus colocynthis L. biodiesel in DI diesel engine
    (Elsevier, 2017) Alloune, R.; Balistrou, Mourad; Awad, S.; Loubar, K.; Tazerout, M.
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    Experimental assessment of performance and emissions maps for biodiesel fueled compression ignition engine
    (Elsevier, 2016) Kezrane, Cheikh; Awad, Sary; Loubar, Khaled; Liazid, Abdelkrim; Tazerout, Mohand
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    Eucalyptus biodiesel as an alternative to diesel fuel : preparation and tests on DI diesel engine
    (2012) Tarabet, Lyes; Loubar, Khaled; Lounici, Mohand Said; Hanchi, Samir; Tazerout, Mohand
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    Experimental evaluation of performance and emissions of DI diesel engine fuelled with eucalyptus biodiesel
    (2011) Tarabet, L.; Loubar, K.; Lounici, M.S; Hanchi, S.; Tazerout, M.
    Nowadays, the increasing oil consumption throughout the world induces crucial economical, security and environmental problems. As a result, intensive researches are undertaken to find appropriate substitution to fossil fuels. We focus in this study on the investigation of using eucalyptus biodiesel as fuel in diesel engine. A single cylinder air-cooled, DI diesel engine, was used to test eucalyptus biodiesel and its blends with diesel fuel in various ratios at several engine loads. Performance and exhaust emissions are evaluated for different operating conditions. Results show that neat eucalyptus biodiesel and its blends present significant reduction of exhaust emissions especially at high loads with equivalent performances to those of diesel fuel