Browsing by Author "Bachari, Khaldoun"

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    By-product Eucalyptus leaves valorization in the basic dye adsorption: kinetic equilibrium and thermodynamic study
    (Walter de Gruyter GmbH, 2024) Babakhouya, Naouel; Benammar, Souad; Hamitouche, Adh'ya-Eddine; Boudjemaa, Amel; Messaoud-Boureghda, Mohamed-Zine; Bachari, Khaldoun
    Algerian Eucalyptus Leaves (AEL), a natural biodegradable adsorbent abundantly available, was used for the removal of methylene blue (MB) dye. The AEL properties for the removal of MB were investigated under different conditions by varying the AEL amount, MB concentration, pH of the solution and the reaction temperature. Scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) techniques have been used to characterize AEL biosorbent. Experimental results showed that the adsorption of MB dye at the concentration of 50 mg L-1 reached to 91 % at pH 10 with a stirring speed of 200 rpm and after 180 min of reaction time. The experimental data were analyzed using the linear forms of different kinetic models (pseudo-first order kinetic model, pseudo-second order kinetic model, and intra-particle diffusion models). The results demonstrated that the adsorption kinetics of MB was consistent with the pseudo-second order model with R 2 value of 0.9969. The isotherm models Langmuir, Freundlich, Dubinin, Elovich, Brunaut Emmet Teller and Temkin models were also investigated to describe the adsorption equilibrium. The results show that the AEL adsorption is in accordance with Temkin isotherm. The thermodynamic study revealed that the adsorption is spontaneous and exothermic. Therefore, as a cheap green adsorbent with high MB adsorption performance, AEL is expected to become one of the best candidate materials for future industrial wastewater treatment.
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    Enhanced Long - term Stability and Carbon Resistance of Ni/Mn x O y - Al 2 O 3 Catalyst in Near - equilibrium CO 2 Reforming of Methane for Syngas Production
    (2020) Djebarri, Baya; Touahra, Fouzia; Aider, Nadia; Bali, Bali; Sehailia, Moussa; Chebout, Redouane; Bachari, Khaldoun; Halliche, Djamila
    Herein we study the catalytic activity/stability of a new generation of cheap and readily available Ni and Al-based catalysts using two Mn precursors, namely Mn(NO3)2and Mn(EDTA)2-complex in the reaction of CO2reforming of methane. In this respect, Ni/Al2O3and two types of Ni/MnxOy-Al2O3catalysts were successfully synthesized and characterized using various analytical techniques: TGA, ICP, XRD, BET, FTIR, TPR-H2, SEM-EDX, TEM, XPS, and TPO-O2. Utilization of Mn(EDTA)2-as synthetic precursor successfully furnished Ni/Al2O3-MnxOyY (Y = EDTA) catalyst which was more active during CO2reforming of methane when compared to Ni/MnxOy-Al2O3cata-lyst, synthesized using Mn(NO3)2precursor. Compared to Ni/MnxOy-Al2O3, Ni/Al2O3-MnxOyY catalyst afforded near-equilibrium conversion values at 700 °C (ca. 95% conversion for CH4and CO2, and H2/CO = 0.99 over 50 h re-action time). Also, Ni/Al2O3-MnxOyY showed more resistance to carbon formation and sintering; interestingly, after 50 h reaction time, the size of Ni0particles in Ni/MnxOy-Al2O3almost doubled while that of Ni/Al2O3-MnxOyY re-mained unchanged. The elevated conversion of CO2and CH4in conjunction with the observed low carbon deposi-tion on the surface of our best catalyst (Ni/Al2O3-MnxOyY) indicated the presence of MnxOyoxide positioning medi-ated simultaneous in-situcarbon elimination with subsequent generation of oxygen vacant sites on the surface for more CO2adsorption. Copyright © 2020 BCREC Group. All rights reserved
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    Gas phase hydrogenation of benzaldehyde over supported copper catalysts. effect of copper loading
    (Elsevier, 2008) Lanasri, Kahina; Saadi, Adel; Bachari, Khaldoun; Halliche, Djamila; Cherifi, Ouiza
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    Regioselective and Catalyst-Free Epoxidation of (E)-3-[3-(2-Hydroxyaryl)-3-oxoprop-1-en-1-yl]chromones
    (Georg Thieme Verlag, 2018) Ameraoui, Rachid; Hammadi, Mohamed; Talhi, Oualid; Hassaine, Ridha; Bouchama, Abdelghani; Abdeldjebar, Hasnia; Belmiloud, Yamina; Brahimi, Meziane; Almeida Paz, Filipe A.; Bachari, Khaldoun; Silva, Artur M. S.
    The uncatalyzed reaction of hydrogen peroxide with (E)-3-[3-(2-hydroxyaryl)-3-oxoprop-1-en-1-yl]chromones resulted in a regio­selective epoxidation of the chromone intracyclic C(2)=C(3) double bond to afford unique isomeric (E)-7a-[3-(2-hydroxyphenyl)-3-oxoprop-1-en-1-yl]-1aH-oxireno[2,3-b]chromen-7(7aH)-ones in high yields. 2D NMR and single-crystal X-ray diffraction were used to elucidate the structures of the chromanone epoxides. Density functional theoretical studies demonstrated a high electrophilicity of the starting chromones
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    Synergistic Effect of Bimetallic Ni-Based Catalysts Derived from Hydrotalcite on Stability and Coke Resistance for Dry Reforming of Methane
    (Springer Nature, 2024) Djebarri, Baya; Aider, Nadia; Touahra, Fouzia; Chebout, Redouane; Lerari, Djahida; Bachari, Khaldoun; Halliche, Djamila
    Bimetallic Ni–Al and Ni–Fe nanoparticles catalysts derived from hydrotalcite were synthesized by co-precipitation method and applied in dry reforming of methane. The samples were calcined at 800 °C and the crystalline phases were assessed by X-ray diffraction coupled with Rietveld refinement. Other analyzes were carried out to study their textural and structural properties including, Thermogravimetric Analysis (TG), Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), Brunauere-Emmette-Teller (BET), Scanning Electron Microscopy and Energy Dispersive-X-ray (SEM–EDX), Temperature Programmed Reduction (TPR), Transmission Electron Microscopy (TEM) and EDS mapping. The XRD Analyses confirmed the formation of the precursor’s layered double hydroxide structure, the formation of the γ-NiFe alloy confirmed by TEM-EDS Analysis. The specific surface area of the two samples increases after calcination, attributed to the destruction of the double-layered structure at high temperature, which produced cavities or crates resulting in larger surface areas. These catalysts were evaluated in CO2 reforming of methane under continuous flow with CH4/CO2 ratio equal to 1, at atmospheric pressure and a temperature range between 400 and 700 °C. At 700 °C, the NiAlHT catalyst displayed the best CH4 conversion (87.5%) and CO2 conversion (91.4%) compared to the conversion of CH4 (79.2%) and CO2 (84.1) for NiFeHT catalyst within 10 h stability test. The iron addition to the nickel showed improved resistance to coke deposition while a slight decrease in methane conversion was observed. The possible formation of γ-NiFe alloy observed during the study of reducibility by hydrogen was invoked to account for the catalytic behavior.