Browsing by Author "Halliche, D."

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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
    (BCREC, 2020) Djebarri, B.; Touahra, F.; Aider, N.; Bachari, K.; Halliche, D.
    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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    Hydrogen production via methane dry reforming process over CoAl and CoMgAl-Hydrotalcite derived catalysts
    (IOP Publishing, 2021) Abdelsadek, Zoulikha; Chaudhari, P.; Holgado, J. P.; Bali, F.; Halliche, D.; Cherifi, O.; Gonzalez-Cortes, S.; Masset, P. J.
    Co0.67Al0.31 and Co0.14Mg0.54Al0.31 hydrotalcite based catalysts were prepared by a co-precipitation method at a fixed pH=11, exhibiting a suitable hydrotalcite structure to be used as a catalyst in the reaction of the dry reforming of methane (DRM). Calcination at 450 C provides the best conditions to prepare the most adapted structure and morphology to be later used in the DRM reaction. The samples were characterised by XRD, FTIR, SEM and it was shown that they exhibit a specific surface in the 30-70 g/cm2 and a crystallite size of approximately 20 nm. The results of the TPR analysis showed clearly that CoAl-HT has better catalytic performances than CoMgAl-HT. This result can be explained by the presence of the Co0 for the catalyst CoAl-HTc-R and the total absence in the sample CoMgAl-HTc-R. The solid CoMgAl-HTc-R requires high reduction temperature compared to CoAl-HTc-R due to the strong CoO-MgO interactions
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    Mg-Fe-hydrotalcite as catalyst for the benzylation of benzene and other aromatics by benzyl chloride reactions
    (Wiley Interscience, 2008) Tahir, N.; Abdelsadek, Zoulikha; Halliche, D.; Saadi, S.; Chebout, R.; Cherifi, Ouiza; Bachari, K.
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    Study of the benzylation of aromatics on nickel-containing mesoporous materials
    (2008) Bachari, K.; Saadi, A.; Halliche, D.; Cherifi, Ouiza
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    Synthesis and structural characterization of iron-modified folded sheet mesoporous materials
    (Springer, 2010) Bachari, K.; Touileb, A.; Saadi, A.; Halliche, D.; Cherifi, Ouiza