Catalyst and Advanced Materials Research Laboratory

Kāshān, Iran

Catalyst and Advanced Materials Research Laboratory

Kāshān, Iran
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Alvar E.N.,Amirkabir University of Technology | Rezaei M.,Catalyst and Advanced Materials Research Laboratory | Alvar H.N.,Sarv Oil and Gas Industries Development Co.
Powder Technology | Year: 2010

In this research, mesoporous nanocrystalline MgAl2O4 spinel powders were synthesized with a facile synthesis method by co-precipitation route using CTAB as surfactant. The prepared samples were characterized by X-ray diffraction, N2 adsorption, thermal gravimetric and differential thermal analyses, Fourier transform infrared spectroscopy and transmission electron microscope. The effects of surfactant to metal molar ratio on the structural properties of the samples were investigated. The obtained results showed that the sample prepared without addition of surfactant presented a lower specific surface area and bigger crystallite size compared with those obtained for the samples prepared by CTAB/metal molar ratio of 0.3. The results showed that the sample prepared by CTAB/metal molar ratio of 0.3 has the highest specific surface area and the smallest crystallite size. Moreover, the CTAB/metal molar ratio higher than 0.3 led to a decrease in the specific surface area, due to destruction of the pore walls. © 2009 Elsevier B.V. All rights reserved.


Keshavarz A.R.,Catalyst and Advanced Materials Research Laboratory | Rezaei M.,Catalyst and Advanced Materials Research Laboratory | Yaripour F.,Petrochemical Research and Technology Company NPC RT
Powder Technology | Year: 2010

In this article, mesoporous nanocrystalline γ-Al2O3 with high surface area is synthesized by a simple sol-gel method with cationic surfactant as template. This sample is used for vapor-phase dehydration of methanol to Dimethyl ether. The synthesized catalyst showed a high surface area of 375 m2 g- 1 and a crystallite size of about 3.9 nm. NH3-TPD analysis revealed that the sample with smaller crystallite size possesses higher concentration of medium acidic sites and consequently the catalytic activity. © 2010 Elsevier B.V. All rights reserved.


Meshkani F.,Catalyst and Advanced Materials Research Laboratory | Rezaei M.,Catalyst and Advanced Materials Research Laboratory
Powder Technology | Year: 2010

A surfactant assisted precipitation method was employed for the preparation of nanocrystalline magnesium oxide with high specific surface area and plate-like shape. Ammonium hydroxide and polyvinyl alcohol (PVA) were used as precipitant and polymeric surfactant, respectively. The effects of several process parameters such as refluxing time, refluxing temperature and magnesium oxide to PVA monomer unit mole ratio (MgO/PVA) were investigated on the structural properties of the powders. The obtained results showed that the increase in refluxing time and temperature increased the specific surface area and decreased the crystallite size. The results revealed that the polymeric surfactant (PVA) has a significant effect on the synthesis of MgO nanocrystals and led to obtain a powder with higher surface area and plate-like shape. © 2009 Elsevier B.V. All rights reserved.

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