D. Halliche

• Professor
• University of Sciences and Technology Houari Boumediene

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...

In this study, we compared the effect of the commercial NiO, synthesis NiAl-HT and NiO-HT drived from hydrotalcite in Knoevenagel condensation reaction. The NiAl-HT sample was synthesized by the coprecipitation method with a molar ratio M2+/M3+ = 2 at constant basic pH. X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) were...

In the downstream of the Oil & Gas industry and decline in oil production, the NiAl-HT derived hydrotalciteis a candidate as catalyst to produce syngas in the methane dry reforming process. Hydrotalcite are lamellar compounds of general formulation[M 1-x ²⁺ M x ³⁺ (OH) 2 ] x+ [A ⁿ⁻ ] x/n .m H 2 Owhere the ionic or cationic character can be tuned by...

In recent decades, considerable attention has been paid to the catalytic dry reforming of methane to obtain syngas. This reaction has very important environmental implications due to the utilization of CH 4 and CO 2 , gases that contribute to the greenhouse effect. The dry reforming of methane is normally carried out over strong basic catalysts wit...

Hydrotalcite catalysts derived from NiAl and NiAlMg mixed oxides were successfully prepared by coprecipitation at a constant pH of 11. Physicochemical methods were investigated to determine their structural and textural properties. Using isopropanol as a probe molecule, the acid–base properties of the catalysts were investigated, and the evaluation...

Co 0.67 Al 0.31 and Co 0.14 Mg 0.54 Al 0.31 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 an...

The importance of the dry reforming of methane (DRM) lies in its capability to upgrade two greenhouse gases (CH4 and CO2) into synthesis gas (CO and H2), which is one of the main building block for synthesizing hydrocarbons. However, the Ni-based catalysts for DRM reaction usually have a major catalytic stability drawback. This works aims to assess...

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 morpho...

According to Authors request (10th December 2020), Corrigendum to: Djebarri, B., Touahra, F., Aider, N., Bali, F., Sehailia, M., Chebout, R., Bachari, K., Halliche, D. (2020). Bulletin of Chemical Reaction Engineering & Catalysis, 15(2), 2020, 331-347 (doi:10.9767/bcrec.15.2.6983.331-347). First Author (Baya Djebarri) is added as member of Corresp...

This study focuses on the synthesis of various nanocomposites with heterojunction structures, MgAl-LDH (LDH = layered double hydroxides) hybrid with semiconductor such as MoO3 and CuO. These solids were synthesized by co-precipitation method at constant pH and have been characterized extensively using atomic absorption spectroscopy (AAS), X-ray dif...

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)2 and Mn(EDTA)2- complex in the reaction of CO2 reforming of methane. In this respect, Ni/Al2O3 and two types of Ni/MnxOy-Al2O3 catalysts were successfully synthesized and characterized...

L'objectif de ce livre est l'tude des proprits texturales et structurelles d'une srie de systmes catalytiques issus des hydrotalcites (HT), et leur application dans la raction de reformage sec du mthane.Dans ce contexte, une premire partie s'est base sur la synthse et la caractrisation des matriaux, prpars par coprcipitation pH basique constant (pH...

Our work focuses on the study of the adsorption of methylene blue (MB) on adsorbents based on zeolite HUSY and (γAl2O3-SiO2). To optimize the process of removing MB onto Ni/Co USY, different parameters were studied such as contact time, initial pH, initial dye concentration, zero charge’s point, and adsorbent dosage. The adsorption isotherm follows...

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 cha...

The large amount of surfactants discharge into wastewater are harmful for both terrestrial and aquatic life; in fact the removal of surfactants from wastewater becomes necessary. The present study is focused on to the removal of sodium dodecyl sulphate surfactant (SDS) by adsorption and photocatalytic degradation using Zn(2)Al-LDH and TiO2/Zn(2)Al-...

The CoAl-LDH and CoFe-LDH hydrotalcite-like compounds (LDH = Layered Double Hydroxides named also hydrotalcite), were successfully synthesized following co-precipitation method at pH = 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 stru...

It is shown that mesoporous hexagonal-ordered silica, containing incorporated nickel particles in the silica matrix (Si/Ni ratio 15), has high catalytic activity in the Pechmann condensation reaction between resorcinol and ethyl acetoacetate and allows one to obtain 7-hydroxy-4-methylcoumarin with high yield and selectivity.

Mixed oxide MnO/Mn3O4 was successfully incorporated into NiAl hydrotalcite derived systems following an ionic exchange protocol via initial introduction of [MnY]²⁻ (Y = ethylenediaminetetraacetic acid (EDTA)) into the interlayer space of NiAl hydrotalcite structure. Upon calcination and subsequent reduction, the resulting material (NiAl-MnYcal.) wa...

Abstract A novel approach describing the in-situ regeneration of NiAl hydroalcite derived catalyst between two cycle reaction systems of CO2 reforming of methane, also known as dry reforming of methane (DRM) is described herein. The catalyst was initially prepared by co-precipitation method at pH = 11 and calcined at 450 °C for 6 h. The obtained ma...

Perovskite oxide LaCuO3 and LaCu0.53Ni0.47O3 were prepared using the sol–gel citrate method, whereas 5% NiO/LaCuO3 was prepared by impregnation. The products obtained, after heat treatment under air at 800 °C, were characterized by several techniques such as: thermogravimetric analysis (TG), inductively coupled plasma atomic emission spectroscopy (...

This study describes the sorption of Cr(VI) by MgAl-NO3 hydrotalcite in a fixed-bed column. The sorbent was prepared via coprecipitation method and characterized by XRD, FTIR, BET surface area and pHzpc . The effects of operating parameters such as bed height, flow rate and inlet concentration were investigated in continuous mode. As a result, the...

The influence of interlayer anions such as NO3ˉ, SO42ˉ and Clˉ on Mg-Al hydrotalcites for Cr(VI) removal from aqueous solution was studied. The structure of the prepared LDHs was characterized by XRD, SEM, FTIR, TGA, BET surface area and pHzpc. The sorbent ability and sorption mechanisms were also investigated. The LDHs exhibit high removal for Cr(...

In this study, the sorption ability of nitrate containing MgAl layered double hydroxide as an anion-exchanger to remove phosphate from a real effluent was investigated. The LDH material was prepared via coprecipitation method and characterized by X-ray diffraction, SEM, Fourier Transform Infrared, BET surface area, and pHzpc. The effect of physico–...

In this study, the sorption ability of MgAl-NO3 layered double hydroxide prepared by coprecipitation method to remove Cr(VI) from aqueous solution was investigated in fixed-bed column. The sorbent was characterized by XRD, SEM, FTIR, BET surface area, and pHzpc. The effects of bed height (2–5 cm), flow rate (5–20 mL/min), inlet Cr(VI) concentration...

Hydrotalcite-type solids of the form NiAl-R, where R refers to the ratio of Ni to Al (R = 2, 3, 5, 8, and 10), were successfully synthesized following co-precipitation method at pH = 12. The obtained solids were calcined at 800 °C, except for NiAl-R 2 where calcination was performed at temperatures ranging between 300 and 800 °C. Following calcinat...

Hydrotalcite-type solids of the form NiAl-R, where R refers to the ratio of Ni to Al (R = 2, 3, 5, 8, and 10), were successfully synthesized following co-precipitation method at pH = 12. The obtained solids were calcined at 800 °C, except for NiAl-R 2 where calcination was performed at temperatures ranging between 300 and 800 °C. Following calcinat...

We report herein an experimental and theoretical study concerning the preparation of the coumarins (2) from 2-hydroxybenzaldehydes (3) and ethyl acetoacetate (4) promoted by amino-grafted SBA-15 materials. The reaction takes places by Knoevenagel condensation between reagents, in the absence of any solvent and under mild conditions, followed by a n...

Layered double hydroxides or hydrotalcite-like compounds with different kinds of metal ions (Mg–Al, Mg–Fe and Mg–Cr) in the brucite-like sheets were prepared by a co-precipitation method with Mg/M3+ molar ratio of ~2. The hydrotalcites were characterized by chemical analysis, X-ray diffraction, Fourier transform infrared spectroscopy, temperature p...

Several catalytic systems containing Ni/Mg/Al/Ce were synthesized from nitrates of Ni2+, Mg2+, Al3+ and Ce3+ cations with M2+/M3+ = 2 ratios by means of the carbonate co-precipitation method and subsequent calcination at 800 ºC. Atomic absorption spectroscopy, X-ray diffraction (XRD), FT-IR spectroscopy, BET, temperature programmed reduction and sc...

The photoevolution of hydrogen is demonstrated on the new hetero-junction CoAl2O4/ZnO. The nano sized spinel obtained from hydrotalcite calcination exhibits a high specific surface area (130 m2 g−1) and good photocatalytic activity. The optical transition of the spinel CoAl2O4 (1.56 eV), directly allowed, is due to Co2+: d–d transition. The capacit...

The structure of hydrotalcite (HT)-like compounds, also know as layered double hydroxides and anionic clays, can be described as containing brucite-like layers. In this study, we aim to compare the following different types of catalyst: NiMgAl-HT, CoMgAl-HT, NiMgLa-HT, and CoMgLa-HT. These samples were prepared by coprecipitation at constant basic...

The hydrogenation of benzaldehyde over a series of nickel-containing mesoporous silicas with different nickel contents was studied at atmospheric pressure in the range temperature of 393 -513 K under H 2 flow. These materials (noted Ni n -HMS with n = Si/Ni = 50, 25, 15) have been prepared at room temperature using a route based on hydrogen bond-in...

A series of chromium-containing mesoporous silicas with different Cr contents were prepared and characterized with chemical analysis, N2 adsorption measurements (BET equation and BJH theory), X-ray diffraction, diffuse reflectance UV-visible and H2-temperature programmed reduction techniques. Excellent results in benzylation of benzene and substitu...

Activated carbon-supported Ni and Cu catalysts were prepared by the conventional wetness impregnation method, and their catalytic activity for benzaldehyde hydrogenation/hydrogenolysis was tested at atmospheric pressure in the temperature range of 100–250 °C. Benzyl alcohol, toluene and methylcyclohexane were obtained through consecutive hydrogenat...

Fe-FSM-16 materials with different Si/Fe ratios (Si/Fe=100, 50, 10) have been synthesized by intercalating kanemite using cetyltrimethylammonium bromide (CTMABr) as the intercalating agent and iron nitrate as the iron source, and characterized by several spectroscopic techniques. Electrons spin resonance and Mössbauer spectroscopies, along with ele...

The alkylation of toluene with benzyl chloride has been investigated over a series of zinc-containing mesoporous silicas with different Zn contents at 80°C. They have been characterized by chemical analysis, BET and XRD. The mesoporous Zn-containing materials were very active alkylation catalysts with almost 100% selectivity to monoalkylated produc...

The gas phase reduction of benzaldehyde on copper supported on SiO2 and ZrO2 were carried in the range temperature of 100°C–350°C under hydrogen atmosphere. The products of benzaldehyde hydrogenation (benzylalcohol and toluene) and hydrogenolysis (benzene) were preferentially formed at low/middle and high reaction temperature respectively. The obse...

The benzylation of aromatics by benzyl chloride over Mg-Cr-LDH (Mg/Cr = 2) clay without or with calcination (at 473–1073K) has been investigated. The catalyst derived from the hydrotalcite by its calcination at 473–1073K show high catalytic activity for the benzylation of aromatics. The catalytically active species present in the catalyst in its mo...

A series of nickel-exchanged catalysts based on ZSM-5, USY, and Mordenite zeolites has been prepared by the ionic exchange method. The NiZeol catalysts have been characterized by XRD and BET. The exchange levels and nickel contents of the catalysts have been determined by chemical analysis. The acidity of the zeolite supports has been investigated...

The benzylation of benzene and substituted benzenes reaction employing benzyl chloride as the alkylating agent over Mg-Fe-LDH (Mg/Fe = 2) clay without or with calcination (at 473–1073 K) has been investigated. Hydrotalcite before and after its calcination was characterized for surface area and crystalline phases. The catalyst derived from the hydro...

A series of catalysts containing nickel, based on HZSM-5 and USY zeolites, have been prepared by ionic exchange; a Ni/γ-Al2O3 catalyst has been prepared by impregnation, for comparison. Ammonia and CO adsorption microcalorimetry and temperature programmed reduction experiments have shown that NiZSM-5 is the most acidic and the most reducible cataly...

A series of modified zeolite catalysts (HYM) was prepared by ion-exchange of a commercial faujasite Y by various cations (M=Ni, Cr, Fe, Li, Ce). The exchange level was calculated from the chemical analysis results. The acidity of the samples was determined by ammonia adsorption calorimetry which allowed the simultaneous determination of the number...

The reforming of methane with carbon dioxide was studied over nickel supported on αAl2O3, γAl2O3, αAl2O3 + SiO2, SiO2, ZrO2, MgO and modified either by transition metallic adducts (Co, Cu and Fe ) or by alkaline promoters Na, K. A strong influence of support nature on the catalytic activity was observed. The catalytic activity of Ni/αAl2O3 was very...

We have studied the CO2-reforming of methane at atmospheric pressure in the range temperature 550–730°C on Ni/α-A12O3 catalysts modified by Fe, Co, Cu and Ce, respectively. The obtained results show that the activities depend on the CO2/CH4 ratio, the nature of the metal additives and the reaction temperature. The order of activity is Ni, NiCo, Ni...