Behgam Rahmanivahid

• PhD of Chemical Engineering
• Associate Professor at Esfarayen University of Technology

Magnetic BaxMg1-xFe2O4 (x = 0, 0.1, 0.2 and 0.3) supports were successfully fabricated by the solution combustion synthesis method. Then, the synthesized supports were impregnated with barium oxide to achieve basic nanocatalysts to produce biodiesel from sunflower oil. Various physicochemical analyses such as XRD, FESEM, EDX, TEM, BET-BJH, VSM, FTI...

In this research a series of metal oxides (SrO, La2O3, CaO, MgO, and Li2O) were loaded over Mg-spinels via a hybrid combustion-impregnation method. Nanocatalysts were characterized by XRD, FESEM, TEM, EDX, BET-BJH, and FTIR analyses. The XRD results showed the formation of pure crystalline phases in all of the nanocatalysts. Among all the nanocatal...

Magnetic spinels MgAlxFe2-xO4 (x = 0, 0.2, 0.4, and 0.6) were synthesized by the gel-combustion method to be used as an adsorbent in the process of methyl orange (MO) dye removal from aqueous solutions. The quantity of MgFe2O4 was reduced by Al doping, which can be attributed to the formation of a mixed structure of MgAlFe spinel or separate spinel...

Fabrication of heterogeneous catalysts via simple routes for biodiesel production, which has high activity, reusability, simple separability, and less sensitivity to the quality of feedstock, is one of the main researches. Therefore, a magnetically separable MgO/MgAl0.4Fe1.6O4 nanocatalyst was fabricated by a combination of impregnation and solutio...

In this research, MgO/MgFe2O4 heterogeneous magnetic nanocatalyst was used in biodiesel production and to study its structural and morphological characteristics, various methods have been used in MgO addition on the support. Impregnation, Precipitation, Precipitation – Hydrothermal, Precipitation – Ultrasonic and Combustion methods were utilized to...

In this paper, Fe 3 O 4 and MgFe 2 O 4 as magnetic samples were successfully synthesized by coprecipitation and combustion methods, respectively, to be used for adsorption of toxic methyl orange molecules from the aqueous solution. Characteristics of the synthesized samples were evaluated using various analyses. The results of crystalline and surfa...

هدف از این تحقیق، بررسی تاثیر امواج ماکروویو بر خصوصیات نانوکاتالیست بازی KOH/Ca12Al4O33 تولیدی به روش سنتز احتراقی و همچنین بر تولید بیودیزل بوده است. به علاوه کیفیت سوخت تولیدی به همراه تاثیر آن بر میزان انتشار آلایندهای خروجی از اگزوز موتور تراکتور مورد بررسی قرار گرفت. کاتالیست سنتز شده ساختار کریستالی مناسب به همراه مساحت سطح بالا را نشان داد...

In this study, microwave-assisted solution combustion method was utilized for fabrication of Mayenite (Ca 12 Al 14 O 33) as support and the amount of urea as important parameter during synthesis of the sample was assessed. Then the supports werre impregnated by KOH and used in the biodiesel production process from canola oil under microwave irradia...

CuO/MgAl2O4 and CuO/MgFe2O4 catalysts were successfully synthesized with the use of spinel supports by a very simple and low-cost mechanochemical method. High-speed ball-milling was used to synthesize these catalyst supports for the first time. Materials were subsequently characterized by using XRD, FESEM, TEM, EDS-Dot mapping, XPS, BET-BJH, and Ma...

Magnetic MgO/MgFe2O4 nanocatalysts synthesized by microwave-assisted combustion method by using various fuel ratios and employed in the production of biodiesel. To evaluate the influence of microwave heating, its results were compared to those of conventional furnace. MgO was dispersed on all the samples using simple and cost-effective impregnation...

هدف از این تحقیق، بررسی تاثیر امواج ماکروویو بر خصوصیات نانوکاتالیست بازی KOH/Ca12Al4O33 تولیدی به روش سنتز احتراقی و همچنین بر تولید بیودیزل بوده است. به علاوه کیفیت سوخت تولیدی به همراه تاثیر آن بر میزان انتشار آلایندهای خروجی از اگزوز موتور تراکتور مورد بررسی قرار گرفت. کاتالیست سنتز شده ساختار کریستالی مناسب به همراه مساحت سطح بالا را نشان داد...

In this study, microwave-assisted solution combustion method was utilized for fabrication of Mayenite (Ca 12 Al 14 O 33) as support and the amount of urea as important parameter during synthesis of the sample was assessed. Then the supports werre impregnated by KOH and used in the biodiesel production process from canola oil under microwave irradia...

The synthesis of MgO/MgAl2O4 was conducted using hybrid microwave-impregnation with different glycine fuel ratios (1, 1.5, 2 and 2.5). To this end, the combustion synthesis (CS) and microwave heating were applied for the synthesis of MgAl2O4, and impregnation was used for the dispersion of MgO active phase on the given samples. The characterization...

MgAl2O4 spinel was synthesized through microwave-assisted combustion method using three different fuels, including urea, glycine and glycerin. This spinel was then used as a support for MgO/MgAl2O4 nanocatalyst in order to produce biodiesel. Results of XRD, EDX, FTIR, BET, TGA, FESEM and SPSD analyses indicated that heating via microwave irradiatio...

The successful synthesis of magnetic MgO/MgFe2O4 nanocatalyst via combustion method was achieved that has far less time and cost than the other methods. This catalyst was used in biodiesel production reaction from vegetable oil. By changing the fuel to nitrates ratio, proper structure of catalyst was obtained to produce biodiesel. Physiochemical an...

In this paper, hybrid-coprecipitation and combustion methods were used to synthesis MgAl2O4 spinel. Of interest was also to evaluate the effect of different synthesis methods on the characteristics and performance of MgO/MgAl2O4 catalyst in biodiesel production. Physicochemical characteristics of synthesized catalysts were evaluated by XRD, FESEM,...

The key challenges for the production of biodiesel are the utilization of cheap oils, such as waste cooking oil (WCO), and insensitive and active heterogeneous catalysts. Therefore, in this study, an alumina-supported sulfated zirconia (SZ) nanocatalyst was synthesized using the solvent-free method and the effect of the optimal percentage of alumin...

1 ‫از‬ 1 ‫اﺧﺘﺮاع‬ ‫ادﻋﺎﻫﺎي‬ 1-‫ﺳ‬ ‫ﻣﻨﻴﺰﻳﻢ‬ ‫ﻣﻐﻨﺎﻃﻴﺴﻲ‬ ‫ﻧﺎﻧﻮﺳﺮاﻣﻴﻚ‬ ‫ﺎﺧﺖ‬ – ‫ﺳﺎﺧﺘﺎري‬ ‫ﻓﺮد‬ ‫ﺑﻪ‬ ‫ﻣﻨﺤﺼﺮ‬ ‫ﻫﺎي‬ ‫وﻳﮋﮔﻲ‬ ‫ﺑﺎ‬ ‫ﻓﺮﻳﺖ‬. 2-‫ادﻋﺎي‬ ‫ﻣﻮرد‬ ‫ﻧﻤﻮﻧﻪ‬ ‫ﺳﻨﺘﺰ‬ ‫ﺑﺮاي‬ ‫اوره‬ ‫ﺳﻮﺧﺖ‬ ‫ﺑﺎ‬ ‫اﺣﺘﺮاﻗﻲ‬ ‫روش‬ ‫از‬ ‫اﺳﺘﻔﺎده‬ 1. 3-‫ﺑﺪﺳﺖ‬ ‫آوردن‬ ‫ﻧﺴﺒﺖ‬ ‫ﺑﻬﻴﻨﻪ‬ ‫ﺳﻮﺧﺖ‬ 5 / 1 ‫ادﻋـﺎي‬ ‫ﻣﻮرد‬ ‫ﻧﻤﻮﻧﻪ‬ ‫ﺗﻮﻟﻴﺪ‬ ‫در‬ ‫ﻛﻪ‬ ‫اﺣﺘﺮاﻗﻲ‬ ‫ﺳﻨﺘﺰ‬ ‫روش‬ ‫ﺑﺮاي‬ 1 ‫ﺷﺪ‬ ‫اﺳ...

In this study, plasma technology was used to prepare the catalysts for biodiesel production. The base of MgO/MgAl2O4 particles was prepared by combustion synthesis method to attain suitable porosity for large molecules of triglyceride and then active phase of MgO was dispersed on the samples by impregnation method. The nanocatalysts were characteri...

In the present research, the effect of different fuels on preparation of MgAl2O4 spinel, as the catalyst support, via the facile and economical combustion synthesis method is investigated. For this purpose, MgAl2O4 is synthesized by applying glycerine, citric acid, ethylene glycol and urea. It is then impregnated by MgO as the active phase of the b...

CaO–Al2O3/ZrO2 mixed oxide catalyst was prepared using free-solvent method. The catalyst was characterized using X-ray diffraction, BET surface area, acidity index (obtained by titration method), and scanning electron microscopy (SEM). With calcium aluminate and calcium zirconate been successfully formed, the mix exhibited small crystal size, high...

MgO/MgAl 2 O 4 nanocatalyst was synthesized by a simple, cost-effective and rapid method and used in biodiesel production from sunflower oil. MgAl 2 O 4 was synthesized by combustion method at different fuel ratios and then active phase of MgO was dispersed on the samples by impregnation method. The nanocatalysts were characterized by XRD, FESEM, ED...

The aim of this study was to examine a new nanocatalyst of SrO/S-ZrO2in esterification reaction and the optimum value of strontia loading over the sulfated zirconia. The sulfated zirconia was supported with different molar ratios of strontia in the range of 0.0-0.30, using the solvent-free method. The samples were characterized using XRD, FT-IR, BE...

The aim of this study was to examine a new nanocatalyst of SrO/S-ZrO2 in esterification reaction and the optimum value of strontia loading over the sulfated zirconia. The sulfated zirconia was supported with different molar ratios of strontia in the range of 0.0-0.30, using the solvent-free method. The samples were characterized using XRD, FT-IR, B...

Currently, the major concern in production of biodiesel fuel is to exploit new catalysts with the optimal conditions. In this study, the effect of calcination temperature on the synthesis of 20 mol % SrO/S-ZrO2 was examined by solvent-free method. Moreover, the ability of the catalyst for esterification reaction of oleic acid with methanol was also...

Solvent-free technique was employed in this work in order to assess the influence of the calcination temperature on the activity of Al-promoted sulfated zirconia. The cata-lyst was analyzed by XRD and IR-spectrum method, and catalytic activity was examined by esterification reaction of oleic acid. XRD analysis revealed that a decline in the per-cen...

Preparation of suitable catalysts was concerned in production of biodiesel from oils with high FFA as west cooking oil. In this study, the effect of loading strontium oxide over sulfated zirconia in catalytic activity was investigated. These catalysts were analyzed by x-ray diffraction and BET and it was observed that Sr-promoted sulfated zirconia...

Preparation of suitable catalysts has been concerned in production of biodiesel from oil with high FFA as west cooking oil. In this study, the catalytic activity of prepared Al-promoted and pure sulfated zirconia by solvent-free method was investigated in esterification of oleic acid to FAME. Due to higher percents of the tetragonal phases of zirco...