Petrochemical Research and Technology Company NPC

Tehrān, Iran

Petrochemical Research and Technology Company NPC

Tehrān, Iran

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Hosseini Z.,Babol Noshirvani University of Technology | Taghizadeh M.,Babol Noshirvani University of Technology | Yaripour F.,Petrochemical Research and Technology Company NPC
Journal of Natural Gas Chemistry | Year: 2011

The capability of sol-gel and conventional precipitation techniques for the synthesis of nanocrystalline γ-alumina was investigated. These catalysts were used for vapor-phase dehydration of methanol to dimethyl ether in a fixed-bed reactor under the same operating conditions (T = 300°C, P = 1 bar, LHSV = 2.8, 11.7, 26.1 h-1) and characterized by means of N 2 adsorption-desorption, NH3-TPD, XRD, TGA and SEM techniques. According to the experimental results, the catalysts prepared using sol-gel method in non-aqueous medium showed better performance compared with those prepared by other methods. © 2011, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. All rights reserved.


Masouleh N.S.G.,Babol Noshirvani University of Technology | Taghizadeh M.,Babol Noshirvani University of Technology | Yaripour F.,Petrochemical Research and Technology Company NPC
Chemical Engineering and Technology | Year: 2014

Mesoporous nanocrystalline γ-alumina was prepared by a template-free sol-gel method using aluminum ethoxide as precursor. Significant parameters, such as the water/aluminum ethoxide molar ratio, the pH of the solution, and the time and temperature of aging, were optimized by the Taguchi method to obtain γ-alumina with a high surface area and pore volume. The influences of the main parameters on the catalytic performance of the prepared catalysts were investigated via dehydration of methanol to dimethyl ether in a fixed-bed reactor. The catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, ammonia temperature-programmed desorption, and scanning electron microscopy techniques. The results show that the aging temperature had a significant influence on the catalyst performance. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Meshkini F.,Babol Noshirvani University of Technology | Taghizadeh M.,Babol Noshirvani University of Technology | Bahmani M.,Petrochemical Research and Technology Company NPC
Fuel | Year: 2010

The Cu/ZnO/Al2O3 catalysts, prepared by co-precipitation method, have been modified by adding small amount of Mn, Mg, Zr, Cr, Ba, W and Ce oxides using design of experiments (1/16 full factorial design). The structure and morphology of catalysts were studied by X-ray diffraction (XRD) and BET. Performance of the prepared catalysts for CO/CO2 hydrogenation to methanol was evaluated by using a stainless steel fixed-bed reactor at 5 MPa and 513 K. The oxide additives were found to influence the catalytic activity, dispersion of Cu, Cu crystallite size, surface composition of catalyst and stability of catalysts during their operations. The results showed that the Mn and Zr promoted catalysts have high performance for methanol synthesis from syngas. Crown Copyright © 2009.


Samei E.,Babol Noshirvani University of Technology | Taghizadeh M.,Babol Noshirvani University of Technology | Bahmani M.,Petrochemical Research and Technology Company NPC
Fuel Processing Technology | Year: 2012

A series of Cu/ZnO-based catalysts were prepared through co-precipitation and alternative pH precipitation methods by adding small amount of colloidal silica (0.6 wt.%) and Mn, Ga and Zr oxides for methanol synthesis from a CO 2-rich feed. The prepared catalysts were characterized by a variety of techniques, including X-ray diffraction, N 2O chemisorption, temperature programmed reduction, BET and TEM. Catalytic tests were carried out in a fixed bed reactor at 4.5 MPa and 513 K with a mixture of CO/CO 2/H 2 = 1/1.38/16.5 and GHSV of 15,000 h -1. An accelerated thermally induced deactivation test was performed in the middle of the catalytic performances. During accelerated thermal test and after rising the temperature, an upward trend was observed for space time yield (STY) over the catalysts. The experimental results indicated that a small amount of SiO 2 and the oxide additives could significantly improve the catalyst activity and stability. © 2011 Elsevier B.V.


Moradi G.,Razi University | Yaripour F.,Petrochemical Research and Technology Company NPC | Abbasian H.,Razi University | Rahmanzadeh M.,Razi University
Korean Journal of Chemical Engineering | Year: 2010

The kinetic behavior of a commercial γ-Al2O3 catalyst for the methanol to dimethyl ether (DME) dehydration reaction has been investigated using a differential fixed bed reactor at the pressure range 1-16 barg within a temperature range of 260-380 °C. The experimental runs were performed in a wide range of feed to water ratios. The experiments were designed by general full factorial design (GEFD) and a novel rate equation has been developed which exhibited the best fitting with our experimental data. Based on the analysis of variance (ANOVA), the following order of importance for operating conditions was obtained when the objective function is the yield of DME: Temperature >Water % in feed >Pressure. In addition, the optimum operating conditions for the maximum yield of DME, were found at T= 380°C, P=16 barg and zero wt% of water in the feed. © 2010 Korean Institute of Chemical Engineers, Seoul, Korea.

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