ali eliassi - Academia.edu (original) (raw)

Papers by ali eliassi

Applied Catalysis B: Environmental, 2011

ABSTRACT

Asian Journal of Chemistry, 2013

Hydrogen is considered as an ideal source of clean energy and a number of major energy companies ... more Hydrogen is considered as an ideal source of clean energy and a number of major energy companies have become increasingly prominent in its development. However it has drawbacks in terms of sourcing, storage and transport which have impeded its wide application 1. Methanol can be converted to hydrogen by three methods including partial oxidation, decomposition and the steam reforming. Among these, partial oxidation and steam reforming might considered be more attractive to methods to produce hydrogen. Nevertheless the methanol steam reforming process has advantages of low cost, mild conditions, low CO content and a product easily separated to provide hydrogen 2-4. Recently much attention has been paid to the studies on catalysts with stability and high catalytic activities at low reaction temperatures for hydrogen production by steam reforming of methanol. A large variety of catalytic materials for the steam reforming of methanol (SRM) reaction, including Ni 5-7 , Pd 8-11 and Cu 12-16 based catalysts, have been reported in the literature. In comparison, low cost and high activity makes Cu based catalysts widely applied and investigated for the steam reforming of methanol. Kobayashi et al.

Journal of Applied Polymer Science, 2005

Density measurements were used to evaluate the excess volume of binary mixtures of poly(ethylene ... more Density measurements were used to evaluate the excess volume of binary mixtures of poly(ethylene glycol) in water and ethanol solvents, poly(propylene glycol) in water and ethanol solvents, and poly(vinyl alcohol) in water solvent at different temperatures for various molecular weights of polymers. The excess volumes were correlated and expressed by a polynomial in terms of the weight fraction of the polymer. The activity of the solvent was expressed in terms of three parts: excess internal energy, excess entropy, and excess volume. The excess volume was derived from the expression obtained in this work, the excess entropy was derived from Flory's lattice model, and the excess internal energy was used as a weight average of the excess volume and entropy parts. The results indicated good agreement between the activity of the solvent calculated by the proposed model and the experimental data. The proposed model has the advantage that using only simple density measurements the activity values that are necessary in the calculation of thermodynamic properties can be evaluated. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 95: 1219–1227, 2005

International Journal of Hydrogen Energy, Feb 1, 2023

Journal of Chemical & Engineering Data, Nov 14, 1998

Activities of water are reported for aqueous solutions of poly(ethylene glycol) (PEG) with number... more Activities of water are reported for aqueous solutions of poly(ethylene glycol) (PEG) with number average molecular weights of 300, 400, 4000, and 6000 are measured at 35, 45, 55, and 65°C and at various concentrations from 0 to 40 wt % of PEG using vapor-pressure osmometery. A cubic equation in terms of PEG concentrations is sufficient for correlation of activities. Using measured activities, the Flory-Huggins interaction parameters have been calculated. The effect of temperature, molecular weight of PEG and its concentration, and volume change upon mixing on interaction parameter have been considered. Ignoring the volume change of mixing can lead to an average error of 2.5% with a maximum error of 5.3%.

Journal of Chemical & Engineering Data, Aug 5, 1998

Densities of aqueous solutions of poly(ethylene glycol) (PEG) have been measured at (300.15, 310.... more Densities of aqueous solutions of poly(ethylene glycol) (PEG) have been measured at (300.15, 310.15, 313.15, 318.15, 323.15, and 328.15) K. The number-average molecular weights for PEG were 400, 4000, and 6000. The density data were fitted by a third-order polynomial with respect to mass fracton of the polymer at each temperature. Using the fitted polynomial expression and the Gibbs-Duhem equation, partial molar volumes of PEG and water for various mixtures were computed and reported.

International Journal of Hydrogen Energy

Journal of Applied Polymer Science, 2003

... Author Information. 1 Chemistry Department, Amir-kabir University of Technology, Hafez Avenue... more ... Author Information. 1 Chemistry Department, Amir-kabir University of Technology, Hafez Avenue, Tehran, Iran. 2 ... Correspondence: H. Modarress, Chemistry Department, Amir-kabir University of Technology, Hafez Avenue, Tehran, Iran. Publication History. ...

Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Dec 1, 1992

Based on Gibbs-Duhem law and using UNIFAC-FV computer algorithm, the activity of polymer componen... more Based on Gibbs-Duhem law and using UNIFAC-FV computer algorithm, the activity of polymer component in polymer-solvent systems is determined. The variation of activity of components with concentration at different temperatures are used to find the equilibrium concentration, UCST, and LCST for the systems. Also by generalization of the method, Gel-Liquid equilibrium is studied in some three component systems: polymer-solvent-solvent..

Journal of Industrial and Engineering Chemistry, 2012

Cu-TiP oxide catalysts, with Cu (1.0 mol%) and P (1.0, 2.0, and 4.0 mol%) incorporated into the f... more Cu-TiP oxide catalysts, with Cu (1.0 mol%) and P (1.0, 2.0, and 4.0 mol%) incorporated into the framework of Ti(1.0 mol%)O 2 , were synthesized using a solvothermal method and their potential compatibilities in methanol steam reforming (MSR) were investigated. The scanning electron microscopy (SEM) image of Cu(1)-Ti(1)-P(2) oxide revealed a uniform sheet type, whereas the other two catalysts, Cu(1)-Ti(1)-P(1) and Cu(1)-Ti(1)-P(4), were irregular and non-uniform. Comparative experiments in oxidative MSR were also conducted over a g-Al 2 O 3 support. The Cu-Ti-P/g-Al 2 O 3 catalysts provided significantly higher MSR reactivity compared to that without P component, and the tendency was similar in the presence of the g-Al 2 O 3 support. The main products from steam reforming over the Cu-Ti-P/g-Al 2 O 3 catalysts were H 2 , CO, and CO 2. The Cu-Ti-P/g-Al 2 O 3 catalysts also reduced the degree of carbon deposition and improved the H 2 product selectivity by facilitating complete oxidation around 600 8C. Herein, we suggest a mechanism in which the P component plays the important role of encouraging the Brønsted acid sites, leading to strong partial oxidation and thermal cracking of methanol to acetaldehyde and CO 2 , and finally to an increased hydrogen yield and suppressed CO generation.

Hydrogen production by steam reforming of dimethyl ether over

The Journal of Chemical Thermodynamics, 2009

The phase separation of (water+salt+polyethylene glycol 15000) systems was studied by cloud-point... more The phase separation of (water+salt+polyethylene glycol 15000) systems was studied by cloud-point measurements using the particle counting method. The effect of three kinds of sulphate salt (Na2SO4, K2SO4, (NH4)2SO4) concentration, polyethylene glycol 15000 concentration, mass ratio of polymer to salt on the cloud-point temperature of these systems have been investigated. The results obtained indicate that the cloud-point temperatures decrease linearly

As a novel performance, methanol gas conversion to dimethoxymethane (DMM) in one-step based on Fe... more As a novel performance, methanol gas conversion to dimethoxymethane (DMM) in one-step based on Fe-Mo-O (iron molybdate mixed oxides) catalysts with high surface area fabricated by metal organic frameworks (MOFs) precursors was improved. For this approach, at first, Fe(III) precursors (iron (III) 1,3,5-benzenetricarboxylate (MIL-100 (Fe) and iron terephthalate (MOF-235)) and Mo(VI) precursor ((NH4)6Mo7O24·٤H2O) were synthesized. The catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) analysis, temperature programmed desorption (NH3-TPD), dynamic light scattering (DLS) technique, Brunauer–Emmett–Teller analysis (BET) and inductively coupled plasma optical emission spectroscopy (ICP-OES) techniques. Application of MOFs as precursors was provided fabricated catalysts with high specific surface area which subsequently...

Journal of the Iranian Chemical Society, 2017

In this study, an ionic complex of V(V) was synthesized by using ultrasonic method, and it was us... more In this study, an ionic complex of V(V) was synthesized by using ultrasonic method, and it was used as a precursor for production of a new catalyst for selective preparation of methylal or dimethoxymethane (DMM). By reaction between an ionic ligand [pyda.H2]2+[pydc]2− (LH2), (pyda.H2 = 2,6-pyridine diammonium and pydc = 2,6-pyridinedicarboxylate) and ammonium vanadate, the five coordinated V(V) complex, [pyda.H][V(pydc)O2], {2,6- diaminopyridinum 2,6-pyridinedicarboxylatodioxovanadate(V)}, VLH2 was synthesized. The prepared complex VLH2 was characterized by SEM, thermal analysis TGA/DTA, FT-IR spectroscopy and X-ray diffraction studies. The results showed that the yield of the reaction was increased up to 64%. The average particle sizes of the obtained complex VLH2 were about 50–60 nm. Also, the nano-catalyst of V2O5/Al2O3 was synthesized by impregnation method and was prepared as a nano-catalyst with average particles sizes of 50–60 nm, and its characterization was performed by XRD...

16 Petroleum Research, 2018 (June-July), Vol. 28, No. 99

Hydrogen was produced by steam reforming of dimethyl ether (DME) using a physical mixture of comm... more Hydrogen was produced by steam reforming of dimethyl ether (DME) using a physical mixture of commercial HZSM-5 zeolite (for DME hydrolyzing) and Cu/ZnO/ Al2O3 (for methanol steam reforming) as a catalyst in a fixed bed reactor. The experiments were performed at atmospheric pressure and in a temperature range from 270 to 310 °C. The effects of feed temperature and gas hourly space velocity (GHSV) between 2420 and 4615 h−1 on DME conversion and H2 and CO concentrations in the gas-phase products were investigated. In addition, the temperature changes along the catalyst bed were measured. The results showed that DME conversion increased with increasing temperature, and also, DME conversion decreased with increasing GHSV. Finally, a homogeneous one-dimensional model was used to model the reactor of hydrogen production by steam reforming of DME. The predicted temperature profile along the catalyst bed and conversion were compared with the experimental data. The model results and experimen...