Mohammad Reza Khosravi-Nikou

Petroleum University of Technology | PUT · Department of Chemical Engineering

Amongst many chemical pollutants that cause environmental pollution, the presence of organic dyes in water resources can cause substantial health issues. Thus, owing to their mutagenicity and their adverse effects on human health, environment, and animals, they must be removed from industrial wastewater. In this study, UiO-66 metal–organic framewor...

Extractive desulfurization has been used as an alternative method to remove sulfur compounds from liquid hydrocarbon fuels because of its simplicity and easy operating conditions. Ionic liquids (ILs) were applied as extractant solvent for extractive desulfurization, due to their unique properties. But the selection of proper cations and anions are...

In this study, ferrate nanoparticles are prepared by solution plasma process and are employed for degradation of different dyes including Bromothymol blue, Cresol Red, Methylene blue, Methyl orange, Methyl Red, Methyl violet and Blue 203. TEM image indicates that particle size of synthesized nano-ferrate is lower than 50 nm. The effects of nanopart...

In this research, separation of paraxylene from mixed-xylene using industrial Eluxyl adsorbent was investigated through batch and dynamic analysis methods at real operating conditions (9 bar and 175 oC). The Ba-faujasite exchanged commercial adsorbent (SPX-3000 fine) was characterized through the BET, XRD, FE-SEM, EDS, XRF, and TGA methods. The sin...

Various nanocomposites of TiO 2 –ZnO, TiO 2 –ZnO/CS, and TiO 2 –ZnO/CS–Gr with different molar ratios were synthesized by sol–gel and ultrasound-assisted methods and utilized under UV irradiation to enhance the photocatalytic degradation of tetracycline. Characterization of prepared materials were carried out by XRD, FT-IR, FE-SEM, EDX and BET tech...

We employ the Cu-MOF-74 framework for the separation of a propane/propylene mixed stream. Performing single and binary component breakthrough experiments demonstrates that this framework has a greater capacity and affinity for propylene relative to propane. A system model is implemented in Aspen AdsorptionTM and validated against experimental data....

In this study, a modified mesoporous adsorbent (MSU-S) impregnated by aluminum was used to remove the aromatic sulfur compounds from n-decane as the model fuel. Physical and chemical properties of as-synthesized adsorbent were investigated by XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy), FTIR (Fourier Transform Infrared spectroscopy)...

In the present study, different metals included Ni and Cu were separately loaded on the mixed matrix of Al2O3-TiO2 to be used in catalytic-oxidative-adsorptive desulfurization of liquid hydrocarbon model fuel. The prepared catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption and field emission scanning electron microsco...

Adsorption is believed to be as a promising technology for efficient separation of propane/propylene mixture which is currently carried out by cryogenic distillation. In the present work, a powerful simulation package was developed using Aspen Adsorption ™ software for simulation of propane/propylene separation process. For this purpose, breakthrou...

A CuO-ZnO@graphitic carbon nitride (Cu/Zn/g) triplex heterojunction nanocomposite was prepared through a multistep ultrasound-assisted hydrothermal procedure. XRD, SEM, EIS, EDX, BET, FT-IR, EDS, UV–Vis, TEM, PL, and transient photocurrent techniques were employed for catalyst characterization. The XRD profiles demonstrated the formation of the ZnO...

In this research, pure hydrogen through chemical looping steam methane reforming with novel oxygen carriers was produced. Ni‐ferrite, Ni‐ferrite‐ZrO2 and Ni‐ferrite‐CeO2 were synthesized as oxygen carriers and characterized by XRD, BET, SEM, DLS and H2‐TPR techniques. Performance of as‐synthesized oxygen carriers in the cyclic oxidation‐reduction w...

The performance of the MIL-101(Cr) loaded with cuprous oxide (Cu2O) nanoparticles was evaluated in both equilibrium and kinetic conditions for adsorption of propane and propylene via volumetric method. The single-component adsorption isotherms were measured at temperatures of 303, 323, 343 and 363 K and pressures up to 400 kPa. To correlate the exp...

In this work, a detailed study on the modeling, simulation and optimization of the industrial-scale Eluxyl simulated moving bed (SMB) process are presented. Commercial SPX3000 (Ba-faujasite type zeolite) was used as an adsorbent, and para-diethylbenzene applied as a desorbent for separating para-xylene from other C8 aromatics isomers. In the first...

In the present study, MIL-101 doped with copper and nickel nano particles were successfully synthesized and applied as promising adsorbents for separation of ethylene/ethane mixture. The as-synthesized adsorbents were characterized using XRD, N2 adsorption-desorption and FESEM analysis. Afterward, the single-component isotherms of C2H4 and C2H6 wer...

The chemical looping steam methane reforming (CL‐SMR) process has two stages: the reduction of oxygen carrier with methane and oxidation of the reduced oxygen carrier by water splitting reaction. In the present research, the reduction stage of the CL‐SMR was investigated at temperature range of 700‐900 ºC to determine the kinetics of the reduction...

In this work, the adsorption and inhibition behavior of 1,3-benzothiazol-6-ol were investigated by computational and experimental techniques for steel X80 corrosion in acidic solution. The density functional theory was carried out and quantum chemical factors like the energy gap, energy of highest occupied molecular orbital, the energy of lowest un...

In this study, adsorption equilibria and kinetics of propane and propylene on Cu-MOF-74 and Co-MOF-74 were investigated at temperatures of 303, 323, 343 and 363 K and pressures up to 100 kPa. Pure component adsorption isotherms and uptake curves were determined via volumetric method. Dual Site Sips model could better fit the experimental data than...

This research article demonstrates how using different turbulence models may affect the temperature detachment (the temperature diminution of cold air (∆Tc = Ti − Tc)) inside straight counter-flow Ranque-Hilsch Vortex Tube (RHVT). The code is utilized to find the optimized turbulence model for energy separation by comparison with the experimental d...

In present work, the batch kinetic adsorption of ethanol on a commercial activated carbon was experimentally investigated and mathematically modeled in order to estimate effective diffusion and average film mass transfer coefficients. The effects of adsorbent loading, ethanol initial concentration and adsorbent particle size were studied. Two kinet...

Contaminated soil via crude oil was remediated through advanced oxidative process. A combination of ultraviolet and ultrasonic irradiation enhanced by Fenton reagents was presented as a promising method with high efficiency for this purpose. The total petroleum hydrocarbon (TPH) removing was designated by central composite design (CCD) to operate a...

The kinetics, equilibrium and thermodynamics studies of adsorptive desulfurization and denitrogenation to eliminate the refractory sulfur and nitrogen compounds like BT, DBT, quinoline and carbazole of model fuel by mesoporous material (MSU-S) and cobalt modified mesoporous material (CoO-MSU-S) adsorbents were carried out. The adsorption performanc...

This paper gives an in-depth insight into NO X (NO, NO 2 , and N 2 O) formation of H 2 /N 2 turbulent Cabra jet flame issuing into a hot vitiated coflow. The joint composition probability density function (PDF) was employed to model the combustion and to specify the characteristics of the flame (i.e., scalar variables, concentration of species etc....

Chemical looping based on steam reforming of methane was used to co-generate syngas (with H 2 /CO ratio of 2) and hydrogen without purification processes. Chemical precipitation method was used to prepare CeO 2 -Fe 2 O 3 combined oxides with different Fe/Ce ratios as the oxygen carriers. The oxygen carriers were tested in the fixed bed micro reacto...

In this study, three silicalite adsorbents (silicalite a, silicalite b and silicalite c) for ethanol adsorption from aqueous phase were synthesized using tetraethylorthosilicate, Ludax solution and a new organic silica source, Tabasheer, respectively. Tetrapropylammonium hydroxide was used as primary structure directing agent and starch as secondar...

A commercial synthetic zeolite (Na-ZSM-5) was modified with an organic surfactant, HDTMA-Br. Then both unmodified and modified zeolite (SMZ-100) were tested to adsorb Benzene, Toluene, Ethylbenzene and Xylene (BTEX) compounds from water solution. Adsorption tests were done in batch conditions at the ambient temperature (20 °C) and pressure. Adsorbe...

Great features of ionic liquids (ILs) lead to consider them as new generation of solvents in liquid-liquid extraction process. In present work, 1-ethyl-3-metylimidazolium thiocyanate ([Emim][SCN]) and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([Emim][Otf]) were utilized as solvents for separation of ethanol from n-decane-ethanol mixture...

This study describes experiments in which MIL-100(Fe) was used to remove Co²⁺ ions from the waste water. The synthesised adsorbent was characterised by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, Brunauer–Emmett–Teller (BET) and scanning electron microscope. Statistical analysis was used to investigate the effects of differen...

Equilibrium batch and dynamic column adsorption of bioethanol from liquid phase on a commercial activated carbon was investigated. The effect of operational parameters including flowrate, bed height and initial solute concentration on column breakthrough curve were studied. Axial dispersion was estimated by a tracer experimental breakthrough curve....

In the present study, liquid phase isotherm adsorption of single component of para xylene, meta xylene, ortho xylene, and ethylbenzene onto a commercial molecular sieve adsorbent (SPX3000-fine) at three different temperatures of 25, 50 and 75 °C had been investigated. It was found that para xylene was the most adsorbed component followed by ethylbe...

The phase behavior of alkane/alcohol/ionic liquid ternary systems is essential for designing the separation process of alcohol from its mixture with alkane. In this work, 1-ethyl-3-metylimidazolium thiocyanate ([Emim][SCN]) has been experimentally studied as an extractive agent for this process. New experimental liquid–liquid equilibria (LLE) data...

In the present study, the effects of non‐Fourier, convection, and radiation heat transfer are investigated in a porous fin under periodic thermal condition. The porosity effect on the fin that allows the flow to infiltrate is formulated using Darcy's model. A nonlinear partial differential equation has been obtained by energy balance for the porous...

Developing simple, accurate and general models for prediction of different properties of hydrofluorocarbons (HFCs) and hydrocarbons (HCs) with hydrofluoro-olefins (HFOs) mixtures is of crucial importance in the design of new refrigeration system. In this communication, four computer based models namely Radial Basis Function Neural Network, Multilay...

In this study, the geometrical parameters of sonoreactor like the probe, reactor diameters, probe immersion depth and amplitude are assessed. The reaction time and H2O2 concentration effect on the sulfur removal efficiency are studied. The results indicate that, first, an increase in probe diameter decreases the efficiency of the process and furthe...

Absorption by alkanolamine solvents is widely used for acid gas removal in natural gas sweetening plant. In the present research, one of the Iranian gas treating unit, Ilam Gas Treating Company (IGTC), with 3.27 mole % H2S and 3.76 mole % CO2 in the inlet feed gas was simulated using HYSYS V8.8. Piperazine activated solution of MDEA (PZ-MDEA) at va...

The application of MSU-S, CeO2-MSU-S, and Cu2O-MSU-S in desulfurization and denitrogenation of model fuel containing benzothiophene (BT), dibenzothiophene (DBT), quinoline and carbazole were studied in batch and continuous process. The copper-modified MSU-S showed the highest capacity to adsorb sulfur and nitrogen compounds compared to other adsorb...

Sulfur containing compounds are one of the most concerning pollutants in fossil fuels. The increasing rate of fuel consumption around the globe reveals the necessity of further purification of the fuels. In this study, application of adsorption process in removing dibenzothiophene from a model fuel is investigated. A granular activated carbon is tr...

One of the major factors that causes air pollution are sulfur oxides) SOx) that exiting from vehicles exhaust by combustion of fossil fuel. Although hydrodesulfurization method has always been the option in oil refineries to reduce sulfur contents, but it is almost impossible to meet stringent new environmental regulation by this method. The Achill...

Nowadays, a continuously worldwide concern for development of process to produce ultra-low sulfur and nitrogen fuels have been emerged. Typical hydrodesulfurization and hydrodenitrogenation technology deals with important difficulties such as high pressure and temperature operating condition, failure to treat some recalcitrant compounds and limitat...

A comprehensive description has been reported concerning the effect of CFD approach with respect to analysis process of Ranque-Hilsch Vortex Tube.

The kinetics study, modeling, simulation and optimization of water gas shift reaction were performed in a catalytic fixed bed reactor. The renowned empirical power law rate model was used as rate equation and fitted to experimental data to estimate the kinetics parameters using gPROMS. A good fit between predicted and experimental CO conversion dat...

Adsorption of heterocyclic sulfur- and nitrogen-containing compounds by mesostructure adsorbent (MSU-S) and its modified form with cobalt oxide is studied using model fuel. The results of characteristic tests (XRD, N2 adsorption–desorption, FTIR, and SEM) indicate that CoO impregnation causes a negative impact on mesoporous structure, crystalline p...

A two-dimensional, pseudo-homogeneous model is used to study the reverse water-gas shift (RWGS) reaction in a fixed-bed reactor under steady-state conditions. A redox kinetic model is applied in the reactor model for a description of the reaction kinetics. Results show that the model predictions have an average error of 2.7 % and are in good agreem...

Adsorption experiments for three commercial metal oxide nanoparticles (SiO2, Al2O3, and MgO) were carried out to examine the effect of each nanoparticle on asphaltene inhibition. The results are reported on the basis of adsorption per mass of adsorbent. The adsorption data were used in four isotherm adsorption models (Langmuir, Freundlich, Temkin,...

In the present study, the enhancement of biodegradability of Direct Orange-26 (azo dye) in aqueous solution by photo-Fenton-like process and nano-Fe2O3 as catalyst was investigated. The effects of initial pH, reaction time, initial concentration of nano-Fe2O3, and H2O2 dosage on the biochemical oxygen demand (BOD5)/chemical oxygen demand (COD) rati...

In the present research, electrocoagulation, ultrasonic, and simultaneous application of both methods were investigated to remove humic acid (HA) from wastewater. For the electrocoagulation method, the effects of five combinations of platinum, graphite, and aluminum electrodes, pH, time, voltage, temperature, and concentration of electrolyte on rem...

In this study, the porosity and non-Fourier effects have been studied for a porous fin under periodic thermal conditions. Darcy’s model has been applied to formulate the porosity effect on the fin that allows the flow to infiltrate through it. The non-Fourier effect should be considered due to the periodic oscillation of the base temperature. Energ...

This study presents a numerical investigation of heat transfer in supercritical CO2 and water turbulent flow in a circular tube. To solve two-dimensional grid systems, RSM turbulent models were used. The effect of mass flow rate and pressure on heat transfer coefficient, flow acceleration and buoyancy parameter were investigated. The numerical resu...

MSU-S catalyst, assembled from ZSM-5 zeolite seed (MFI), was synthesized with silica to alumina ratio 55 and characterized by XRD, NH3-TPD, BET and FT-IR techniques. It was tested in a vertical fixed bed reactor for selective production of light olefins from methanol (MTO) at temperatures of 400, 450 and 500 oC and WHSV of 1, 5 and 25 h−1. After th...

The new high surface area and high active nano-sized porous γ-Al2O3 catalyst was produced by a co-precipitation method. The synthesized catalyst was characterized by X-ray diffraction, Fourier transform infrared, NH3-temperature programmed desorption, and Brunauer-Emmett-Teller techniques. The results of characterization tests showed excellent text...

This study investigates production of biodiesel from waste cooking oil (WCO) under direct ultrasonic irradiation using KOH and NaOH as catalysts. Specifically, the effects of methanol to oil ratio, catalyst type, catalyst loading and reaction time on biodiesel conversion were studied. Methanol to oil ratio as low as 4:1 gives a high conversion of 9...

Computational fluid dynamics (CFD) used to investigate pressure drop and liquid holdup in high-and low-pressure trickle-bed reactors (TBRs). CFD results compared with experimental data from literature and found that CFD is a useful tool for hydrodynamics investigation of high-pressure TBRs. It is shown that by increasing pressure in TBRs, pressure...

Supported cobalt-based Fischer-Tropsch catalysts with high loading of active metal sites have been prepared using an ultrasound-microwave-assisted method. The impregnation of titania support has been performed by adding cobalt nitrate stepwise when ultrasound treatment is implemented to disperse metal. This method improves the metal deposition and...

The performance of the aluminosilicate mesostructure (MSU-S) and its modified forms with phosphotungstic acid (HPW) and nickel oxide-HPW (NiO-HPW) for desulfurization and denitrogenation of model diesel fuels were studied. According to the results of characteristic tests (N2 adsorption-desorption, XRD, SEM, and NH3-TPD), HPW incorporation causes hi...

The current work deals with ZnO-Ag nanocomposites (in the wide range of x in the Zn1 − xO-Agx chemical composition) synthesized using microwave assisted solution combustion method. The structural, morphological and optical properties of the samples were characterized by XRD (X-ray diffraction), FTIR (Fourier transform infrared spectrometry), SEM (s...

One of the most commonly used processes for the removal of acid gases from natural gas is absorption in alkanolamine-based solvents. Operating cost and energy consumption beside environmental cares are the main limiting factors, which lead process designers to select optimum values of sensitive parameters in sweetening plants. This paper summarizes...

In this research a one-dimensional mathematical model was developed to investigate the effects of inlet temperature, pressure, and feed flow rate on an adiabatic fixed bed reactor over Na-HZSM5 catalyst for dehydration of methanol to dimethyl ether. Results indicated that temperature profile and methanol conversion are mostly affected by inlet temp...

The adsorption equilibria of toluene from aqueous solutions on natural and modified diatomite were examined at different operation parameters such as pH, contact time, initial toluene concentration was evaluated and optimum experimental conditions were identified. The surface area and morphology of the nanoparticles were characterized by SEM, BET,...

Among the all parameters affecting the performance of a downhole de-oiling hydrocyclone, the investigation of internal flow field deserves more attempts especially in the petroleum industry. In this study, the effects of inlet flow rate, inlet oil volume fraction, and oil droplet diameter on the separation efficiency and pressure drop ratio have be...

This research includes synthesis of nano-sized gamma-Al2O3 catalyst for methanol dehydration reaction to produce DME. A co-precipitation method with four precipitants including sodium carbonate, sodium bicarbonate, ammonium carbonate and ammonium bicarbonate was used for this purpose. The catalysts were characterized by XRD, FTIR, NH3-TPD, SEM, TEM...

In this research an optimum multicomponent catalyst derive using adaptive neuro-fuzzy inference system (ANFIS) and artificial neural network (ANN) with combination of genetic algorithm. The resulted formula for catalyst compared with experimental data from literature and it was found that C2 yield based on ANFIS method has good agreement to experim...

The vapor phase dimethyl ether (DME) synthesis is simulated by hysys process simulation software, and relevant cost analysis is also conducted. Based on cost estimation results, it is found that capital investment of the classic DME process is greatly influenced by the distillation towers and operating costs. Accordingly, to solve these problems, a...

Nanocrystalline γ-Al2O3 is prepared by addition of ammonia to an aqueous solution of Al(NO3)3 with vigorous stirring and ultrasonic vibration, followed by calcination at 600 °C for 5 h.