Oxydes et Matériaux Méso-Structurés

Utilisation des hydroxydes doubles lamellaires comme nano-containeur pour la vectorisation des médicaments

Projets

  • « Matériaux innovants pour la production d’hydrogène » : Programme de coopération PHC TASSILI 2019.
  • « Systèmes de distribution active (médicaments, vitamine protéine dans le corps) ». Projet à impact socio-économique DGRSDT
  • « Référentiel National des Richesses Minières ». Projet à impact socio-économique DGRSDT

Top Publications

2019

Role of the nanoparticles of Cu-Co alloy derived from perovskite in dryreforming of methane

Fouzia Touahra, Redouane Chebout, Djahida Lerari, Djamila Halliche, Khaldoun Bachari

Abstract

Enhanced the carbon resistance and sintering of the metal-active site of catalysts for the dry reforming of methane (DRM) can be achieved by the metal-perovskite interaction. Perovskite-based catalysts LaCoO3 and LaCu0.55Co0.45O3 were prepared using the sol-gel citrate method. The products obtained, after heat treatment under air at 800 _C, were characterized by several techniques such as: inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauere Emmette Teller method (BET), scanning electron microscopy (SEM-EDX), transmission electron microscopy (TEM) and temperature-programmed reduction (TPR). After reduction, the catalysts were evaluated in the reforming of methane reaction under continuous flow with CH4/CO2 ratio equal to 1, at atmospheric pressure and temperature ranging from 400 to 700 _C. LaCu0.55Co0.45O3 catalyst exhibit higher activity compared to LaCoO3. According to the catalytic and characterization results before and after reaction, the higher activity obtained in the case of LaCu0.55Co0.45O3 can be explained by the lower Co particle size and formation of Cu-Co alloy during the reduction which prevents the CoO formation.

2019

Selective gasphase hydrogenation of benzaldehyde in the presence of Ni, Co and Fedoped BaCuO2 delafossites: effect of metal substituent on the production of benzyl alcohol

Hanane Zazoua, Fouzia Touahra, Moussa Sehailia, Redouane Chebout,Djahida Lerari, Khaldoun Bachari, Adel Saadi.

Abstract

Delafossite mixed metal oxides of the form BaCuO2 and BaCu1M1−xO2 (M = Ni,Fe and Co) were successfully synthesized following a sol–gel citrate method. The products, obtained after heat treatment under N2 at 800 °C, were characterized using several techniques such as: thermogravimetric analysis (TG), inductively coupled plasma atomic emission spectroscopy (ICP), X-ray diffraction (XRD) spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, Fourier transform infrared (FTIR) spectroscopy and temperature-programmed reduction (TPR). The formation of the delafossite oxide structure for all solid powders was confirmed by XRD. The BET surface area of all catalysts was lower than 10 m2 g−1. The catalytic

performance of the synthesized catalysts was evaluated in the vapor-phase hydrogenation of benzaldehyde. Benzyl alcohol and toluene were obtained through consecutive hydrogenation/hydrogenolysis reactions, while benzene was formed via a concomitant hydrogenolysis reaction. BaCuO.47Ni0.51O2 catalyst showed better activity at 250 °C with 98% benzaldehyde conversion. Under the same conditions, BaCuO.52Fe0.48O2 catalyst showed the highest selectivity for benzyl alcohol (84% at 20% of conversion).

2018

Improvement of catalytic stability and carbon resistance in the process of CO2 reforming of methane by CoAl and CoFe hydrotalcite-derived catalysts

N. Aider, F. Touahra, F. Bali, B. Djebarri, D. Lerari, K. Bachari, D. Halliche.

Abstract

The CoAl-LDH and CoFe-LDH hydrotalcite-like compounds (LDH ¼ Layered Double Hydroxides

named also hydrotalcite), were successfully synthesized following coprecipitation method at pH ¼ 12. A several characterization techniques including TGA, ICP, XRD, N2 adsorption and desorption, H2-TPR, O2-TPO, SEM-EDX and TEM, were utilized to determine the structure function relationship for the obtained catalysts. These catalysts were evaluated in CO2 reforming of methane under continuous flow with CH4/CO2 ration equal to 1, at atmospheric pressure and a temperature range between 400 and 700 _C. The iron addition to the cobalt showed improved resistance to coke deposition while a slight decrease in methane conversion was observed compared to CoAlcal-R catalyst (cal ¼ after calcination and R ¼ after reduction) derived from CoAl-LDH precursor.