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Ghasaban S.,Iran Polymer And Petrochemical Institute | Atai M.,Iran Polymer And Petrochemical Institute | Imani M.,Iran Polymer And Petrochemical Institute | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory
Scientia Iranica | Year: 2016

ZnO nanostructures were formed via a hydrothermal reaction mechanism between simple anionic (ammonia or sodium hydroxide) and cationic (zinc acetate dehydrate) precursors without using any organic templates. Effects of the reaction conditions, including the initial solution pH, type and concentration of the anionic and cationic precursors, and the reaction time and temperature, on the nanostructure particle size and morphology were investigated. The nanostructures formed were analyzed by powder X-ray diffraction, energy dispersive X-ray analysis, and scanning electron microscopy. According to the results, the morphology of the nanostructures is highly pH-dependent. Needlelike nanostructures were formed using ammonia at initial solution pH value around 9, but plate-like nanostructures were formed using NaOH at pH value around 13, regardless of the reaction time or temperature. The precursors concentration could not be considered as an independent parameter per se as it consequently changes the reaction medium pH, which affects the morphology in turn. In general, increasing the reaction time and temperature increased the mean particle size of the nanostructures with no significant change in their morphology. It was found that the nanostructure morphology changes from nanoneedle to star-like at higher addition rates of ammonia. © 2016 Sharif University of Technology. All rights reserved.


Jafarbegloo M.,Inorganic Nanostructures and Catalysts Research Laboratory | Jafarbegloo M.,Iran National Petrochemical Company | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Mesbah A.W.,Inorganic Nanostructures and Catalysts Research Laboratory | And 2 more authors.
Catalysis Letters | Year: 2016

The influence of calcination temperature (500, 600 and 700 °C) on NiO-MgO solid solution formation and the performance of the resulting catalysts in CO2 reforming of methane was studied. The solid solutions and resulting catalysts were characterized by Brunauer-Emmett-Teller, XRD, temperature-programmed reduction (TPR), TEM and thermal gravimetric analysis techniques. Catalytic performance tests were carried out under 550-750 °C, 1 bar, CO2/CH4 = 1-3 mol/mol and space velocities of 30,000-120,000 ml/(h gcat). The catalyst calcined at 600 °C exhibited the best performance in terms of catalytic activity and stability and showed lowest amount of coke formation after 50 h-on-stream. The effect of calcination temperature on degree of NiO-MgO solid solution formation was demonstrated by both XRD and TPR profiles. The 600 °C calcination temperature was found to be an optimum as it caused modest NiO-MgO interaction, which is responsible for complete formation of the NiO-MgO solid solution with high nickel dispersion and resistant to coke formation. © 2015 Springer Science+Business Media New York.


Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Joharian V.,Inorganic Nanostructures and Catalysts Research Laboratory | Narimani K.,Inorganic Nanostructures and Catalysts Research Laboratory | Muzart J.,CNRS Institute of Molecular Chemistry - Reims | Fallah M.,Inorganic Nanostructures and Catalysts Research Laboratory
Journal of Solid State Chemistry | Year: 2013

In a new approach, chromium (III) tetraaza dioxo ligand was grafted onto functionalized SBA-15 after four step reactions by using coordinating ability of anchored amino functionalized SBA-15. After the termination of each step, the obtained product was characterized by FT-IR, low-angle X-ray diffraction (LA-XRD), N2 adsorption-desorption isotherms (Brunauer-Emmett-Teller (BET)-Barret-Joyner-Halenda (BJH)) and thermogravimetric analysis (TGA), and used as catalyst for the efficient and regioselective alcoholysis of styrene oxide to 2-alkoxy-1-phenylethanol product at ambient temperature. © 2013 Elsevier Inc. All rights reserved.


Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Narimani K.,Inorganic Nanostructures and Catalysts Research Laboratory | Mohammadipanah F.,University of Tehran | Hamedi J.,University of Tehran | And 2 more authors.
Applied Surface Science | Year: 2015

In a new approach, a copper(II) tetraaza macrocyclic complex (CuTAM) was covalently bonded on modified multi-walled carbon nanotubes (MWCNTs). To achieve this purpose, MWCNTs were converted to MWCNT-COCl and then reacted to NH groups of TAM ligand. The prepared material was characterized by Fourier Transform Infrared (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, thermal gravimetric analysis (TGA), and FESEM (field emission scanning electron microscopy). FT-IR and TGA demonstrated the presence of the organic moieties, and XRD proved that the structure of MWCNTs remained intact during the three modification steps. An increase in the ID/IG ratio in Raman spectra confirmed the surface modifications. Finally, the samples were subjected to an antibacterial assessment to compare their biological activity. The antibacterial test showed that the grafted complex on the surface of the nanotube (MWCNT-CO-CuTAM) has higher antibacterial activity against Bacillus subtilis ATCC 6633 than the MWCNT-COOH and CuTAM with 1000 and 2000 μg/mL. © 2015 Elsevier B.V. All rights reserved.


Tahermansouri H.,Islamic Azad University at Āmol | Abedi E.,Islamic Azad University at Āmol | Heidari-Keshel S.,Tehran University of Medical Sciences | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory
Materials Technology | Year: 2015

Carboxylated multiwall carbon nanotubes (MWCNT-COOH) were first modified by an imidazole derivative, 2-amino-1-methyl-5-(3,4,5-trimethoxybenzylidene)-1H-imidazol-4(5H)-one, to form a MWCNT-Im and then by thiosemicarbazide to produce MWCNT-Py. All products were characterised by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscope, energy dispersive X-ray spectroscopy, solubility test, thermogravimetric analysis, derivative thermogravimetric and cellular investigations. These functionalisations have been chosen due to active sites of C5C and carbonyl groups in MWCNT-Im and NH2 and sulphur groups in MWCNT-Py, which might be used as functional materials in future. Toxicity of these samples was evaluated with human gastric (MKN45) and colon (SW742) cancer cells, and the killed cell numbers were measured by reduction in living cells with 3-(4,5-dimethyl-2-thiazolyl)- 2,5-diphenyltetrazolium bromide (MTT) after 48 h of cell culture experiments. Cellular investigations showed high toxicity of modified MWCNTs on the gastric cancer cells compared to colon cells. In addition, MWCNT-Py sample indicated the highest toxicity for both cancer cells compared to other samples. © 2015 W. S. Maney & Son Ltd.


Jafarbegloo M.,Inorganic Nanostructures and Catalysts Research Laboratory | Jafarbegloo M.,Iran National Petrochemical Company | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Mesbah A.W.,Inorganic Nanostructures and Catalysts Research Laboratory | Sahebdelfar S.,Iran National Petrochemical Company
Journal of Natural Gas Science and Engineering | Year: 2015

In a new approach, a series of NiO-MgO solid solution catalysts with different NiO contents (5, 10, 15 and 20 wt %) were prepared by one-pot sol-gel/evaporation method. Nitrogen adsorption/desorption, XRD, TPR, TGA, SEM and TEM techniques were used to correlate the activity and stability to the structural properties of the catalysts. The catalysts exhibited mesoporous structures with high surface areas, large pore volumes and narrow pore size distributions. From 15% NiO content onwards, the TPR profiles showed evidence of isolated NiO phase from the solid solution. The catalytic performance was investigated for carbon dioxide reforming of methane in a fixed bed reactor (ID = 8 mm) at 550–750 °C and 1 bar with feed composition CO2/CH4 = 1 and space velocity of 30,000 ml/h.gcat. The Ni element showed uniform dispersion within the mesoporous matrix illustrating the advantage of the one-pot synthesis method. The Ni particle size was availably confined in this method. It was found that the catalytic activity and stability were strongly affected by the nickel content. The results were revealed that the 10% NiO/MgO catalyst calcined in 600 °C combined sufficiently high activity with slight coke formation and excellent catalytic stability at 750 °C during dry reforming reaction. Kinetic study revealed that the first-order rate laws were appropriate for main reaction and the catalytic deactivation. © 2015 Elsevier B.V.


Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Zarabadi M.P.,Inorganic Nanostructures and Catalysts Research Laboratory
Solid State Sciences | Year: 2013

In a new approach, strong basic sites has been successfully prepared by loading of calcium nitrate (Ca) on organized nano-porous alumina (ONPA). The prepared CaONPAs were characterized by low-angle X-ray diffraction (XRD), N 2 adsorption-desorption isotherms (Brunauer-Emmett-Teller (BET)-Barret-Joyner-Halenda (BJH)), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). Measuring of the amount of the basic sites and the basicity was carried out by titration method, temperature-programmed desorption (TPD-CO2) and Hammett indicators. Resistance of the basic sites was also tested by washing with water. N2 sorption measurements showed that supporting of the calcium nitrate on ONPA can lead to the bimodal porosity at lower loading. BET surface area of the bare ONPA was 212 m 2/g which decreased to 111 m2/g for the 25% of loading of Ca (25CaONPA). The results pointed out that CaONPA samples have basicity between 18.4 < H- < 22 for 15 and 25% of loadings and well-preserved of the basicity after washing with water especially for 5 and 15% samples. Also no crystalline phase of CaO was observed for 25CaONPA which was calcined at 600 °C. © 2012 Elsevier Masson SAS. All rights reserved.

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