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Aligholi Niaei,Behrang Izadkhah,Daryush Salari,Shahriar Hosseinpoor,Seyed Ali Hosseini,Ali Tarjomannejad 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Perovskite formulations of LaB0.5Co0.5O3 (B=Cr, Mn and Cu) were examined and evaluated as catalyst for reduction of NOx by CO. Among the different and various formulations, LaMn0.5Co0.5O3 showed the highest activityselectivity with 89.84% conversion of NO and 9.62% yield of N2O at 400 oC. Therefore, more precise evaluations were implemented on LaMnxCo1−xO3 to find the optimum formulation. The LaMn0.25Co0.75O3 included the maximum performance (68.79% conversion of NO at 350 oC and 92.85% at 400 oC) and N2O yield (9.01); therefore, it was selected as optimum catalyst. Characterization methods were utilized to correlate activity and physical-chemical properties. The presented activity and reducibility of catalysts were improved due to partial substitution of Co3+ by B cation. Finally, no direct relationship was found between surface area and catalyst activity. The optimum catalyst showed complete activity- selectivity higher than 450 oC.
Aligholi Niaei,Zahra Shayegan,Mohammad Razzaghi,Dariush Salari,Mohammad Taghi Shervani Tabar,Arash Noshad Akbari 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
Ultrasound-assisted oxidative desulfurization process (UAOD) was applied to reduce sulfur compounds of gas oil containing various types of sulfur content. The environmental regulation requires a very deep desulfurization to eliminate the sulfur compounds. UAOD is a promising technology with lower operating cost and higher safety and environmental protection. For the first time the typical phase transfer agent (tetraoctyl-ammonium-bromide) was replaced with isobutanol because using isobutanol is much more economical than TOAB, imposing no contamination. The reaction was carried out at optimal point with various temperatures, in single-, two- and three step-procedures,investigating the effect of gradual increase of H2O2 and TOAB being used instead of isobutanol. Total sulfur concentration in oil phase was analyzed by ASTM-D3120 method. The highest removal of about 90% for gas oil containing 9,500mg/kg of sulfur was achieved in three-steps during 17 minutes of process at 62±2 oC when 180.3 mmol of H2O2 was used and extraction carried out by methanol.
Azadeh Jodaei,Aligholi Niaei,Darush Salari 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
Gas phase catalytic oxidation of ethyl acetate was studied in low concentration over Fe-Ag-ZSM-5 catalysts under atmospheric pressure. The effect of important parameters such as Ag loading, Fe loading, calcinations temperature and reaction temperature was investigated and the process conditions were optimized using response surface methodology (RSM) based on central composite design (CCD). The optimum condition for Ag loading, Fe loading, calcination temperature and reaction temperature was 5.17 wt%, 2 wt%, 580 ℃ and 350 ℃, respectively. A maximum of 96% of ethyl acetate was removed under the optimum experimental conditions. The proposed model equation using RSM has shown good agreement with the experimental data, with a correlation coefficient (R^2) of 0.949.
Ali Farzi,Ali Tarjomannejad,Aligholi Niaei,Dariush Salari 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
Catalytic oxidation of toluene over perovskite-type oxides of the general formula LaMn1−xBxO3 (B=Cu, Fe and x=0, 0.3, 0.7) and La0.8A0.2Mn0.3B0.7O3 (A=Sr, Ce and B=Cu, Fe) was investigated, where the catalysts were synthesized by sol-gel auto combustion method. The catalysts were characterized by XRD, BET, H2-TPR, XPS, and SEM. Obtained XRD patterns confirmed the perovskites to be single-phase perovskite-type oxides. Specific surface areas of perovskites were obtained between 25-40m2/g. The perovskite catalysts showed high activity for the toluene oxidation. Based on the results, Fe-containing perovskite catalysts exhibited higher activity than Cu-containing perovskite catalysts. The substitution of Sr and Ce in A-site of the perovskite catalysts enhanced their activity for toluene oxidation. Among different synthesized catalysts in this research, La0.8Ce0.2Mn0.3Fe0.7O3 has the highest activity. Nearly complete elimination of toluene was achieved at 200 oC with this catalyst. Based on Langmuir–Hinshelwood mechanisms, kinetic studies were conducted on toluene oxidation, indicating LH-OS-ND (adsorption of reagents on same types of sites and non-dissociative adsorption of oxygen) as the most probable mechanism which could predict the experimental data with correlation coefficient of R2=0.9952.
Hosseini, Seyed Ali,Niaei, Aligholi,Salari, Dariush,Jodaei, Azadeh Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Activities of nanostructure HZSM-5 and Co-ZSM-5 catalysts (with different Co-loading) for catalytic conversion of ethyl acetate and toluene were studied. The catalysts were prepared by wet impregnation method and were characterized by XRD, BET, SEM, TEM and ICP-AES techniques. Catalytic studies were carried out inside a U-shaped fixed bed reactor under atmospheric pressure and different temperatures. Toluene showed lower reactivity than ethyl acetate for conversion on Co-ZSM-5 catalysts. The effect of Co loading on conversion was prominent at temperatures below $400^{\circ}C$ and $450^{\circ}C$ for ethyl acetate and toluene respectively. In a binary mixture of organic compounds, toluene and ethyl acetate showed an inhibition and promotional behaviors respectively, in which the conversion of toluene was decreased at temperatures above $350^{\circ}C$. Inhibition effect of water vapor was negligible at temperatures above $400^{\circ}C$. An artificial neural networks model was developed to predict the conversion efficiency of ethyl acetate on Co-ZSM-5 catalysts based on experimental data. Predicted results showed a good agreement with experimental results. ANN modeling predicted the order of studied variable effects on ethyl acetate conversion, which was as follows: reaction temperature (50%) > ethyl acetate inlet concentration (25.085%) > content of Co loading (24.915%).
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Samira Arefi Oskoui 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The correlation between physical–chemical properties and activities of LaB0.5Co0.5O3 (B = Cr, Mn, Cu)nano perovskites was studied in combustion of toluene. LaMn0.5Co0.5O3 showed the highest activity among LaB0.5Co0.5O3 catalysts and further optimization study was focused on LaMnxCo1-xO3 (x = 0.1,0.25, 0.5). The activity and reducibility of catalysts improved due to partial substitution of Co3+ by B cation. No direct relationship was between surface area and catalyst activity. T50% of 2-propanol over LaMn0.25Co0.75O3, LaMn0.5Co0.5O3, LaMn0.1Co0.9O3 and LaCoO3 was 168, 200, 220 and 229 8C,respectively. LaMn0.25Co0.75O3 was the optimum catalyst and showed robust stability in combustion of toluene and 2-propanol.
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Raimundo K. Vieira,Shamil Sadigov,Seyed Reza Nabavi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Optimization of 2-propanol oxidation over CuMnmCo2-mO4 nanospinels was carried out by a split design method. 15-term model was proposed to fit the experimental data. The model revealed that both whole plot and subplot variables have significant effects on conversion of 2-propanol. The model predicted the interaction of subplot and whole plot variables as well as their importance. The maximum conversion of 2-propanol was observed over CuMn2O4 (x1 = 0.33, x2 = 0, x3 = 0.67) at calcination and reaction temperatures of 800 8C (z1 = 1) and 300 8C (z2 = 1), respectively. The predicted response and the response obtained from experiment for optimum conditions were 93.36 and 96, respectively.
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Azadeh Jodaei 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Activities of nanostructure HZSM-5 and Co-ZSM-5 catalysts (with different Co-loading) for catalytic conversion of ethyl acetate and toluene were studied. The catalysts were prepared by wet impregnation method and were characterized by XRD, BET, SEM, TEM and ICP-AES techniques. Catalytic studies were carried out inside a U-shaped fixed bed reactor under atmospheric pressure and different temperatures. Toluene showed lower reactivity than ethyl acetate for conversion on Co-ZSM-5 catalysts. The effect of Co loading on conversion was prominent at temperatures below 400℃ and 450℃ for ethyl acetate and toluene respectively. In a binary mixture of organic compounds, toluene and ethyl acetate showed an inhibition and promotional behaviors respectively, in which the conversion of toluene was decreased at temperatures above 350℃. Inhibition effect of water vapor was negligible at temperatures above 400℃. An artificial neural networks model was developed to predict the conversion efficiency of ethyl acetate on Co-ZSM-5catalysts based on experimental data. Predicted results showed a good agreement with experimental results. ANN modeling predicted the order of studied variable effects on ethyl acetate conversion, which was as follows: reaction temperature (50%) > ethyl acetate inlet concentration (25.085%) > content of Co loading (24.915%).
Selective production of propylene from methanol over nanosheets of metal-substituted MFI zeolites
Naser Hadi,Reza Alizadeh,Aligholi Niaei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
The nanosheets of M-substituted (M: Mn, Ce, W) MFI zeolites were successfully synthesized via hydrothermal method. The catalysts were satisfactorily characterized by different techniques and the well synthesized nanostructures were approved. The prepared catalysts were examined in methanol to propylene process and showed improved performance compared to the conventional H-ZSM-5. The Wsubstituted MFI nanosheets productively represented the best performance with complete methanol conversion, propylene selectivity of 55.70%, total selectivity to light olefins of 88.04% and catalytic lifetime of 81 h. Furthermore, TGA and BET analyses were conducted to characterize the coke deposition. The lowest coke was detected on W-substituted MFI nanosheets.