Mohammed Bensitel

Mohammed Bensitel
Université Chouaib Doukkali · chimie

Professor

About

76
Publications
14,219
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2,008
Citations
Citations since 2016
21 Research Items
747 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140

Publications

Publications (76)
Article
Full-text available
Synthesis of a pure copper orthophosphate ( CuP ) prepared by Coprecipitation, and CuP modified by impregnation of NiMo (2-14 wt % of Ni-Mo oxide) have been carried out. The solids obtained were investigated as synthesized or after calcination by various physico-chemical techniques such as X-Ray Diffraction (XRD), Infrared Spectroscopy (IR), Thermo...
Article
Full-text available
The catalytic performance of Fe supported on nickel phosphate (NiP) was evaluated for the removal of bisphenol A (BPA) by catalytic wet air oxidation (CWAO) at 140 °C and 25 bar of pure oxygen pressure. The prepared NiP and Fe/NiP materials were fully characterized by XRD, N2-physisorption, H2-TPR, TEM, and ICP analysis. Iron (Fe/NiP) impregnation...
Article
Full-text available
Hydrochar derived from Argan nut shell (ANS) was synthesized and applied to remove bisphenol A (BPA) and diuron. The results indicated that the hydrochar prepared at 200 °C (HTC@ANS-200) possessed a higher specific surface area (42 m2/g) than hydrochar (HTC@ANS-180) prepared at 180 °C (17 m2/g). The hydrochars exhibited spherical particles, which a...
Article
Full-text available
A novel structured carbon foam prepared from argan nut shell (ANS) was developed and applied in bisphenol A (BPA) removal from water. The carbon foam showed 93% removal of BPA (60 mg/L). The BPA equilibrium data obeyed the Liu isotherm, displaying a maximum uptake capacity of 323.0 mg/g at 20°C. The calculated free enthalpy change (∆H°= -4.8 kJ/mol...
Article
In this work, TiO2 supported on bovine bone powder by-product (BBP) was used as photo-catalyst for the degradation of methylene blue (MB) dye in aqueous solutions under UV-irradiation. The main parameters which govern the photo-catalytic treatment efficiency, such as pH, weight of catalyst added to solution, UV-irradiation period, initial concentra...
Article
Full-text available
In this work, TiO2 supported on bovine bone powder by-product (BBP) was used as photo-catalyst for the degradation of methylene blue (MB) dye in aqueous solutions under UV-irradiation. The main parameters which govern the photo-catalytic treatment efficiency, such as pH, weight of catalyst added to solution, UV-irradiation period, initial concentra...
Article
The higher heating value (HHV) is an important characteristic for the determination of fuels quality. Nevertheless, its experimental measurement requires intricate technologies. In this work, the HHV of coal was predicted from ultimate composition using two methods: multiple regression and genetic programming. A dataset of 100 samples from literatu...
Article
Full-text available
Catalytic performances of Pt-based catalysts supported on various oxides (Al2O3, MgO, SiO2, and CeO2) prepared by a sol-gel method were evaluated by gas-phase hydrogenation of acetonitrile, in order to investigate the influence of acid-base properties of support oxides on products distribution. Acid-base properties were studied by pyridine adsorpti...
Article
Full-text available
Synthesis of a pure copper orthophosphate (CuP) prepared by Coprecipitation, and CuP modified by impregnation of vanadium (2-12 wt % of V2O5) have been carried out. The solids obtained were investigated as synthesized or after calcination by various physico-chemical techniques such as X-Ray Diffraction (XRD), Infrared Spectroscopy (IR), Thermogravi...
Article
This paper investigated the photocatalytic degradation of Methylene Bleu (MB) (as one of model compounds of organic dyes in wastewaters) over TiO2 catalyst supported on Hydroxyapatite (HAp). HAp was synthesized by the double decomposition method; thereafter titanium oxide (TiO2) was supported on this base by the chemical wet impregnation (WI) metho...
Article
The aim of this work was to study the influence of the support oxide properties on the total oxidation of dichloromethane in moist conditions. The support materials γ-Al2O3, TiO2, CeO2 and MgO were synthesized by a sol-gel method followed by wet impregnation of Pt and characterized by different physico-chemical techniques. The conversion of DCM was...
Article
The heating value describes the energy content of any fuel. In this study, this parameter was evaluated for different abundant materials in Morocco (two types of biochar, plastic, synthetic rubber, and cardboard as municipal solid waste (MSW), and various types of biomass). Before the evaluation of their higher heating value (HHV) by a calorimeter...
Presentation
The 100% DCM conversions were reached at 500 °C over the most acidic samples (γ-Al2O3 and TiO2). At this temperature, about 70 % HCl yield was reached. Over CeO2 based catalysts the DCM conversion at 500°C was more than 90 % with 60 % of HCl yield. Finally, less than 20 % DCM conversion was observed over the MgO based catalysts. Pt impregnation of...
Article
Due to their harmful effects, finding the optimal catalysts for Sulfur containing Volatile Organic Compounds (S-VOC) oxidation is an important environmental challenge. A series of Pt-Cu catalysts supported on alumina (Al2O3), silica (SiO2) and silica doped alumina (Al2O3)0.8(SiO2)0.2 were prepared and tested in the catalytic oxidation of dimethyldi...
Article
Libethenite Cu2(PO4)(OH) was simply synthesized by heterogeneous reaction using a mixture of Cu(NO3)2·6H2O, (NH4)2HPO4 and water at room temperature for 60 min. The thermogravimetric study indicates that the synthesized compound is stable below 250°C and its final decomposed product is Cu3(PO4)2. The pure monoclinic phases of the synthesized Cu2(PO...
Article
This work investigated the quantification of soot in the producer gas during bio-oil thermal conversion process. A Laser extinction device was specially developed based on Beer-Lambert law. A calibration of the measurement was performed with acetone as one of the model compounds of bio-oil. The pyrolysis of acetone revealed a maximal soot productio...
Article
Full-text available
Titanium dioxide was synthesized by the sol–gel method and platinum supported on titanium dioxide were prepared by a wet impregnation chemical process at different platinum contents. The prepared samples were dried over night at 110 °C and then calcined at 500 °C for 4 h. Structural and morphological characterization has been carried out by means o...
Poster
The present study is focused on photo-catalytic degradation of an organic dye (methylene blue) in water solutions using a series of hydroxyapatite (HAP),Ti/HAP, Zr/HAP and Mg/HAP.These composite catalysts of different ratios have been successfully synthesized by combining double decomposition method and wet impregnation process.The characterization...
Article
Organic dyes and colouring textile agents are persistent pollutant materials that are difficult to decompose by microbiological treatment processes. Their oxidation through photocatalysis is an alternative way to prevent contamination of the environment. In this work, calcium deficient hydroxyapatite (HAP) was synthesized and doped with different a...
Article
Organic dyes and colouring textile agents are persistent pollutant materials that are difficult to decompose by microbiological treatment processes. Their oxidation through photocatalysis is an alternative way to prevent contamination of the environment. In this work, calcium deficient hydroxyapatite (HAP) was synthesized and doped with different a...
Article
Full-text available
In this work, we study the adsorption in aqueous medium of two organic dyes, Methylene blue (MB) and Red195, on palm bark and sugarcane bagasse. Both plant materials have been first characterized. A series of experiments was then conducted to study the influence of different operating conditions on the adsorption capacity. All results obtained show...
Article
Full-text available
In the current work, indium doped zinc oxide thin films were deposited by spray pyrolysis technique on glass substrate at 350 °C. The effect of the preparation conditions on the structural, morphological, optical and electrical properties of the films has been studied. The molar ratio of indium in the spray solution was varied from 0 to 5 at %. All...
Article
Full-text available
In this work, we study the elimination of two organic dyes (Methylene blue MB and Red195) by adsorption on fly ash and bottom ash from a thermal power plant (province of El Jadida). The two adsorbents were previously characterized. A series of experiments was then conducted to study the influence of some parameters on the adsorption capacity such a...
Poster
Dichloromethane (DCM) is one of the most widely used solvents and degreasing agents, and it is hazardous and harmful to the environment and human health [1]. To achieve total oxidation of DCM, Pt catalysts washcoated on different cordierite monoliths are evaluated in this work. The monoliths, which are largely used as support structures in ozone de...
Article
Full-text available
In this work, the degradation of Orange Acid 7 (OA7) dye by heterogeneous photocatalysis using a non-stoichiometric hydroxyapatite doped with titanium was investigated. First, the developed catalyst was characterized by different analytical techniques such as XRD, FTIR and TGA-DTA. Its effectiveness in degrading OA7 dye was then studied in a batch...
Poster
The performance of following catalysts Pt/(Al2O3) (denoted PtAl), Pt/(TiO2) denoted PtTi), Pt/CeO2 (denoted PtCe) and Pt/MgO (PtMg) and their supports (Al2O3, TiO2, CeO2 and MgO) was evaluated by dichloromethane (DCM) oxidation in moist conditions. The supports were prepared by solgel method (using alkoxide as precursors of aluminium, titanium and...
Article
The influence of the catalyst support shapes on the performance of liquid monopropellant thrusters was investigated. In the present work, two supports: monolith honeycombs and alumina grains were tested and their relative performances were compared. Ir-monolith catalyst with total metallic contents of 30 wt.% in mass were prepared by the wet impreg...
Article
Three different transition metals (V, Mn and Cu) supported on TiO2, MgO and CeO2, were investigated for their performances in dichloromethane oxidation (500 ppm, 704,867 h−1) in moist conditions as a model reaction for the destruction of chlorinated volatile organic compounds. The catalysts were prepared by sol–gel method followed by wet impregnati...
Article
Catalyst samples based on vanadium, cerium and titanium oxides were prepared using sol–gel method and wet impregnation. Several analytical techniques were used to characterize catalysts. The best activity and selectivity in the partial oxidation of methanol and methyl mercaptan were observed for the catalyst sample with the composition of 3 % V2O5/...
Article
Cerium dioxide containing materials have involved much interest in recent years owing to their broad range of applications in various fields. The most important property that makes ceria as an excellent catalytic material is its oxygen storage and release capacity via the ability of ceria to rapidly switch from Ce3+ to Ce4+ under reducing and oxidi...
Article
Full-text available
In the present study, titanium dioxide and tungsten-modified titanium dioxide photocatalysts were synthesized by sol-gel method. Structural and morphological characterization has been carried out by using X-ray powder diffraction (XRD), FT-IR spectroscopy, BET surface area and transmission electron microscopy (TEM) coupled to the energy dispersive...
Poster
Chlorinated volatile organic compounds (CVOCs) are hazardous compound emitted to atmosphere by various sources. The number of directives and legislation are set and adopted by the different countries to decrease or limit the CVOC. Catalytic oxidation is one way to treat these emissions and it exhibits high conversion of CVOCs even at low temperatur...
Poster
Preparation, Characterisation, Activity test, Mixed Oxide
Article
Full-text available
Synthesis and physico-chemical characterization of a pure magnesium phosphate (MgP) prepared by coprecipitation, and MgP modified by introduction of cobalt–molybdenum (4–12wt.% of MoO3 with the Co/Mo ratio fixed at 0.5) have been carried out. The structural properties of these catalysts were characterized by X-ray diffraction, their textural proper...
Article
Full-text available
In this paper we describe the synthesis and characterization of the acido–basic properties of catalysts containing varied amounts of vanadium supported on ZrO2. The preparation of the zirconia was carried out using a hydrolysis method and the vanadium was introduced by impregnation with a porous volume in several stages, followed by calcinations un...
Article
Full-text available
A series of mixed oxide catalysts CexZr1−xO2 with different compositions (x = 0.93, 0.80, 0.75, 0.60, 0.55, and 0.50) were synthesized by co-precipitation technique using ammonia as the precipitant agent. Textural and structural properties of calcined ceria–zirconia oxides were characterized by nitrogen adsorption, X-ray diffraction and Raman spect...
Article
Full-text available
Titanium dioxide was synthesized by the sol–gel method and titanium pillared purified clay was prepared with two titanium contents: 1.15 and 10.5mmol of Ti per gram of clay. The composites were synthesized by immobilizing TiO2 onto surfactant-pillared clay via ion exchange reaction between clay with cation surfactant, cetyl-trimethyl ammonium bromi...
Article
Full-text available
Full factorial experimental design technique was used to study the main effects and the interaction effects between operational parameters in the photocatalytic degradation of oxalic acid in a batch photo-reactor using TiO2 aqueous suspension. The important parameters which affect the removal efficiency of oxalic acid such as agitation, initial con...
Article
Full-text available
The synthesis of vanadyl phosphate by reaction of an alcoholic solution of V2O5 and o-H3PO4 has been studied. The solids obtained were investigated by various physico-chemical techniques as in situ X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential thermal analysis (DTA) under inert atmosphere. The compounds have been furth...
Article
Full-text available
A series of Zr(0.4)Ce(0.6-x)Mn(x)O2 mixed oxides catalysts with different compositions (x = 0; 0.12; 0.24; 0.36; 0.48) were prepared by a sol–gel method. The samples calcined at 500°C were characterized by X-ray diffraction (XRD), surface specific areas (SSA) and H2-TPR measurements and tested in the butanol oxidation. Using a sol-gel method very h...
Article
Full-text available
In the present study, tin oxide thin film was prepared by a simple and inexpensive chemical evaporation technique from an aqueous solution at 673 K. Scanning electron microscopy, X-ray diffraction, Energy dispersive X-ray analysis and X-ray fluorescence were employed to characterize the resulting catalyst. The photocatalytic efficiency of the prepa...
Article
The objective of the present study is to synthesise simple metal oxides titania (TiO2), zirconia (ZrO2) and zirconia-titania mixed oxides containing 25, 75 mol % of titanium (TiO2-ZrO2). All the samples were prepared by the sol-gel processing method using titanium (IV) propoxide and zirconium (IV) propoxide, 70 wt % solution in 1-propanol as the pr...
Article
Catalytic wet air oxidation (CWAO) of aqueous solution of phenol was carried out with pure oxygen at 160 °C in a stirred batch reactor on platinum supported oxide catalysts (Pt/CeO2c calcined at 650 and 800 °C and Pt/CexZr1 − xO2 with x = 0.90, 0.75 and 0.50). The catalysts were characterized before (BET, FT-IR spectroscopy, hydrogen chemisorptions...
Article
During the preparation, the nature of the precipitating agent strongly influences the synthesis of magnesium phosphate. Ortho and pyrophosphate can be obtained with the use of NaOH and NH4OH, respectively. The solids obtained were investigated as synthesized or after calcination by various physico-chemical techniques such as X-ray diffraction (XRD)...
Article
This work describes the preparation, the characterization of the hysico chemical properties of catalyst containing vanadium supported on Al{2}O{3}, and study of its catalytic activity in the reaction of conversion of SO{2} to SO{3}, the synthesis of the alumine was carried out by hydrolysis of isopropoxyde aluminium in solution of isopropanol. Vana...
Article
Full-text available
In this study, we were interested in the physic - chemical characterization (SEM, BET, X-ray, DTA-TG, and IR) of the flying ashes stemming of the combustion of the coal in the thermal power station of JORF-LASFAR in EL Jadida (Morocco). On the one hand, we deduce from this study that these flying ashes are belonging to the class F Fly ash (accordin...
Article
A series of sulphated binary oxides ZrO2-TiO2 (10 wt% SO42-) was prepared by simultaneous hydrolysis of zirconium n-propylate and titanium n-propylate, followed by calcination at 450°C. The sulphatation was performed before hydrolysis by addition of H2SO4 to Ti and Zr mixed alkoxides solutions. The so-obtained mixed catalysts are amorphous, and the...
Article
FT-IR Characterization of superficial and acidic properties of phosphated zirconia. The nature of phosphate species formed by impregnation of zirconia by (NH4)2HPO4 followed by decomposition at 400°C was studied by IR spectroscopy. These species present hydroxyl groups characterized by a ν(OH) band at 3666 cm−1 due to the P-OH stretching vibration....
Article
Decomposition of isopropanol on mixed calcium-silver apatites. A new family of apatite materials Ca10-xAgx(PO4)6(OH)2-x□x were synthesized, then studied using the decomposition reaction of isopropanol. The catalytic activity of the mixed apatites was observed to correspond mainly to dehydrogenation reaction features (the formation of acetone). This...
Article
Adsorption of CS2 on a series of metal oxides (Al2O3, ZrO2, ZnO and CeO2) activated at 723 or 973 K was studied at room temperature by FT-IR spectroscopy. In addition to hydrogen thiocarbonate and carbonate species, a new species, characterized by bands in the 1200-1000 cm(-1) range, was evidenced. Its amount increased by increasing activation temp...
Article
Different metal oxides have been impregnated by sulfur S8 and treated under H2O at increasing temperature up to 330°C. In case of TiO2 and Al2O3, H2S and SO2 emissions have been detected by gas chromatography, showing that the reverse Claus reaction between sulfur and water occurs. Addition of sulfate ions to TiO2 and Al2O3 prevents the reaction, w...
Article
Sulfate species formed by heating SO2 in excess of O2 at 723K on TiO2, ZrO2, Al2O3 and Al2O3 promoted by Fe, Cu, Ni, Mo, W or V were studied by FT-IR spectroscopy. The presence of Ni, Cu or Fe enhance sulfate formation on the alumina support. The sulfated samples were then heated under H2S at different temperatures. It was found that sulfate specie...
Article
Full-text available
Treating a NH4EMT zeolite with a solution of (NH4)2SiF6 at 80 °C affords a solid containing amorphous SiO2 intimately mixed with the zeolite. This acidic support EMT-Si was loaded with NiMo sulfide in order to prepare a bifunctional catalyst, which was tested for the hydrogenation of benzene and the hydrocracking of n-heptane. This NiMo/EMT-Si cata...
Article
Full-text available
Treating a NH4EMT zeolite with a solution of (NH4)2SiF6 at 80°C affords a solid containing amorphous SiO2 intimately mixed with the zeolite. This acidic support EMT-Si was loaded with NiMo sulfide in order to prepare a bifunctional catalyst, which was tested for the hydrogenation of benzene and the hydrocracking of n-heptane. This NiMo/EMT-Si catal...