tarek_ali

Tarek T. Ali

Professor - Professor

Faculty of science

Address: Chemistry Department, Faculty of Science, Sohag University, Sohag, P.O.Box 82524, Egypt

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Influence of preparation conditions on the catalytic activity of high surface
High surface area SiO2 samples were synthesized by one-step hydrolysis and co-condensation at different pH (between 3.0 and 6.0) using tetraethyl orthosilicate as the Si source and formamide as the drying additive. The effects of the presence of H2O, formamide and NH3 solution on the hydrophobic nature, textural properties and catalytic functionality of SiO2 were investigated. The physico-chemical properties of ... Read more

2016 | Keywords Lithium zirconate Biodiesel,
Effect of preparation conditions on structural and catalytic properties of lithium zirconate
Inorganic (inorg) and organic (org) routes with acid (A) and base (B) hydrolyzing agents were utilized to synthesize lithium zirconate (LiZr) nanomaterials. The effect exerted by the nature of hydrolyzing agent and synthesis route on the morphology and structural properties of the samples was studied by X-ray diffraction, Raman spectroscopy, TEM, XPS, N2-adsorption and CO2-TPD techniques. The characterization results showed ... Read more

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts
Mesoporous CuO-ZrO2 catalysts were prepared and calcined at 500 C. The performance of the synthesized catalysts for benzylation of benzene using benzyl chloride was studied. The bare support (macroporous ZrO2) offered 45% benzyl chloride conversion after reaction time of 10 h at 75 C. Significant increase in benzyl chloride conversion (98%) was observed after CuO loading (10 wt. %) on ... Read more

Photocatalytic Degradation of p-Nitrophenol in Aqueous Suspension by Using Graphene/ZrO2 Catalysts
A series of reduced graphene oxide (rGO) supported zirconia (ZrO2) nanocomposites with 1, 2 and 5 wt.% GO were synthesized using the sol–gel technique. The reduced graphene oxide/zirconia composites were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) high resolution transmission electron microscopy (HRTEM), ultravioletvisible (UV–Vis) and, X-ray photoelectron spectroscopy (XPS), and N2 adsorption and desorption ... Read more

Effect of pretreatment temperature on photo catalytic activity of microwave irradiated porous nanocrystalline ZnO
Porous nanocrystalline ZnO photocatalysts were successfully synthesized by microwave irradiation and then thermally treated at different temperatures (150 1C, 200 1C, 250 1C and 300 1C). The physicochemical properties of synthesized samples were determined by using different characterization techniques. The characterization results indicated that the as-synthesized sample was comprised of both ZnO and Zn(OH)2 phases with a particle size of ... Read more

Influence of crystal structure of nanosized ZrO2 on photocatalytic degradation of methyl organge
Nanosized ZrO2 powders with near pure monoclinic, tetragonal, and cubic structures synthesized by various methods were used as catalysts for photocatalytic degradation of methyl orange. The structural and textural properties of the samples were analyzed by X-ray diffraction, Raman spectroscopy, TEM, UV-vis, X-ray photoelectron spectroscopy (XPS), and N2 adsorption measurements. The performance of synthesized ZrO2 nanoparticles in the photocatalytic degradation ... Read more

2014 | Keywords Benzylation Dispersion,
Nanosized iron and nickel oxide zirconia supported catalysts for benzylation of benzene: Role of metal oxide – support interaction
Nanocrystalline Fe2O3and NiO mesoporous ZrO2supported catalysts were prepared and thermallytreated at 500◦C. The efficacy of catalysts for catalyzing the benzylation of benzene using benzyl chloridewas studied. The mesoporous ZrO2alone showed only benzyl chloride conversion of 44% after a reactiontime of 600 min at 75◦C. An increase in the conversion of benzyl chloride to 49% was observed afterloading 10 wt% of ... Read more

2014 | Keywords Biodiesel Magnesium silicate,
Effect of Si precursor on structural and catalytic properties of nanosize magnesium silicates
Two Si precursors, inorganic (sodium silicate) and organic (tetraethoxy silane), were used to synthe-size magnesium silicate (MgSil) nanomaterials. The effect exerted by the nature of Si precursors on themorphology and structural properties of the samples was studied by chemical analyses, X-ray diffrac-tion, HRTEM, FTIR spectroscopy, XPS, N2adsorption, solid-state NMR spectroscopy and TPD of CO2 and NH3 techniques. The characterization results ... Read more

Ethanol to hydrocarbons using silver substituted polyoxometalates: Physicochemical and catalytic study
Thermally stable and insoluble silver salts of 12-molybdophosphoric acid with varying amount of Ag cations were prepared. XRD results indicated the presence of single phase of AgxH3xPMo12O40 (0 < x < 3). FTIR and Raman results indicated that Ag was incorporated in the secondary structure of Keggin ion. The catalytic conversion of ethanol increased in the order of H3PMo > ... Read more

Effect of synthesis methods for mesoporous zirconia on its structural and textural properties
Zirconia was synthesized by sol–gel and posthydrothermal treatment under autogenous pressure in order to study the effect of synthesis methods on its structural and textural properties. On the basis of thermal analysis, in situ X-ray diffraction and Raman spectroscopy techniques, the synthesis processes exhibit similar thermal behavior and zirconia phase transformation. The effect of in situ calcination temperature on the ... Read more