فهرست مطالب

Iranian Journal of Catalysis
Volume:11 Issue: 2, Spring 2021

  • تاریخ انتشار: 1400/04/13
  • تعداد عناوین: 11
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  • Hameed Hussein Alwan *, Hasan Makki, Tahseen A. Al Hattab Pages 101-111

    Cobalt and Molybdenum oxides supported on graphene catalyst CoMo/G were prepared then its activity for hydro-desulfurization reaction HDS was examined in this research. The catalyst was characterized by X-ray diffraction XRD, Fourier transform infrared spectroscopy FTIR, and energy dispersive spectroscopy EDS while surface morphology was tested by scanning electronic microscopy SEM and atomic force microscopy AFM. The texture properties (specific surface area and pore volume) are measured by the Brunauer, Emmett and Teller BET method. The catalyst activity investigation was conducted by heavy naphtha HDS reaction in a fixed bed reactor, this study investigated the effect of temperature (250-325) ºC, Liquid Hourly Space Velocity LHSV (3-6) hr.-1 and hydrogen partial pressure (1-1.3) MPa while gas/oil ratio was kept a constant 50 ml/ml, these variables’ impact was designed and analyzed by Taguchi design of experiment DOE with using MINITAB software. The results showed that sulfur removing percentage SR% increases with both increasing of temperature and hydrogen partial pressure whereas LHSV has the opposite effect on SR%. HDS reaction kinetics parameters were estimated by experiment results employing Levenberg-Marquardt and SPSS software version 20; the results showed the HDS reaction which followed 1.863 order, reaction rate constant and activation energy, is 32.309 kJ/mol.

    Keywords: Heavy Naphtha, CoMo catalyst, Graphene, hydro desulfurization, reaction kinetics, Taguchi Method, Levenberg-Marquardt Algorithm
  • Javad Safaei Ghomi *, Rahele Teymuri Pages 113-123

    Mesoporous CoAl2O4 spinel nanocrystals ( nano-CoAl2O4 ) were synthesized and fully characterized by X- ray diffraction patterns (XRD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), DLS (dynamic light scattering) and FT-IR. The nanocrystals promoted the preparation of quinazolinones via the one-pot, three component condensation reaction of benzaldehydes, isatoic anhydride, primary aromatic amine or ammonium acetate at 45°C under ultrasound irradiation. Experimental simplicity, great yields in concise times, the retrievability of the nanocrystals and performing the sonochemical methodology as an effective way in synthetic chemistry for the preparation of medicinally privileged heterocyclic molecules are some of the substantial features of this method. The present catalytic process is applicable to an extensive diversity of substrates for the preparation of a variety-oriented library of dihydroquinazolinones. The feasibility of doing one-pot synthesis under ultrasonic irradiation with a heterogeneous nanocrystal could improve the reaction rates and shorten the reaction times.

    Keywords: Dihydroquinazolin, Ultrasonic, CoAl2O4 spinel nanocrystals, One-pot
  • Shahla Veysipour, Masoud Nasr Esfahani *, Zahra Rafiee, Behrouz Eftekhari Far Pages 125-136

    Various magnetite heterogeneous catalysts for the organic reaction are increasingly recognized while their stability still is a critical challenge. In this regard, SiO2, ionic liquid (IL), and polyvinyl pyrrolidone (PVP) were applied as a three-layer stabilization system for modifying magnetic Fe3O4 to produce Fe3O4@SiO2@IL‐PVP as a novel nanocatalyst. The Fe3O4@SiO2@IL‐PVP as stabilized heterogeneous catalysts were utilized in a robust, and environmentally friendly strategy for the preparation of the spirooxindole derivatives by the one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyl in a water solvent. The proposed method revealed a high yield spirooxindole derivatives preparation (99%) at short reaction times (1.0 min), low catalyst mass (0.002 g), and satisfactory temperature (30 °C) which confirm the lack of any tedious challenge and promising applicability and reusability. This work introduces a rational core-shell nanosystem design with a facile and novel construction strategy to arrive at nonexquisite metal-based composite catalysts with superior catalytic proficiency and prominent long-term stability.

    Keywords: Magnetic nanoparticles, Spirooxindoles, Green synthesis, Fe3O4@SiO2@IL‐PVP nanocomposite, reusable catalyst
  • Hamzeh Rezaei Shadegan, Sarah Maghsoodi *, Bijan Ghanavati, Amirhossein Shahbazi Kootenaei, Alireza Azimi Pages 137-147
    Cobalt-based perovskites containing strontium and copper (La1-xSrxCo1-yCuyO3) were synthesized by the sol-gel method and characterized by XRD, H2-TPR, N2-adsorbtion, XRF and XPS techniques. The XRD results showed that the rhombohedral structure of perovskites was obtained. The activation energy employed to analyze the activities of samples in the combustion of methane was optimized using full factorial design (FD) by considering strontium (x=0, 0.1 and 0.2) and copper (y=0, 0.25 and 0.5) as the input variables. Analysis of Variance (ANOVA) was employed to investigate the obtained data and a p
    Keywords: methane, Perovskite, Cobalt, strontium, Copper
  • Seyed Kamal Blourfrosh, Kazem Mahanpoor * Pages 149-163
    The main purpose of this study was to investigate the photocatalytic decomposition of the antibiotic Cefazolin (CFZ) from aqueous solutions using a new effective catalyst. This catalyst was made of α-Fe2O3-supported nanoparticles on a metal-organic framework (MOF). The synthesis of Nano α-Fe2O3 photocatalyst was performed by the reflux condensation method. The MOF was synthesized using Cadmium nitrate and Terephthalic acid and Nano α-Fe2O3 supported on MOF using a solid-state distribution (SSD) method. FTIR, XRD, SEM, EDX, N2 adsorption-desorption and TGA technique were used for the identification of the catalyst. Analysis of these results revealed that α-Fe2O3 circular nanoparticles bonded together and occupy a large area on the MOF crystal surfaces. The BET surface area and the pore diameter of ​​the catalyst obtained were 479 m2g-1 and 3.86 nm respectively. UV/H2O2 photocatalytic processes were applied for the decomposition of CFZ from aqueous solutions. This process was optimized and modeled using the full factorial method. Initial concentrations of CFZ, pH, α-Fe2O3/MOF amounts and initial concentration of H2O2 were the variables for the determination of optimal conditions and mathematical models. The highest degradation percentage of CFZ in the optimum condition (CFZ=30 ppm, pH=8, H2O2=5ppm, catalyst=150mg.l-1) was 85.88%. This photocatalyst reaction has pseudo-first-order kinetic with a constant rate of 0.0752 min-1 and it also matched the Langmuir–Hinshelwood model.
    Keywords: Photocatalyst, Cefazolin, α-Fe2O3, Metal-organic framework, Solid-state distribution
  • Elham Fadavipoor *, Rashid Badri Pages 165-174
    Si-Im/HSO4(1-methyl-3-(3-(trimethoxysilyl) propyl) imidazolium hydrogen sulphate functionalized Copper oxide nanoparticles(CuO NPs )as a novel supporting ionic liquid was prepared and characterized by FT-IR spectroscopy, FE-SEM, XRD, TGA, and EDX techniques. It was used as a recyclable catalyst for the one-pot, three-component synthesis of 1, 4- dihydro Pyrano [2, 3-c] pyrazoles derivatives. The results showed that the catalyst was very efficient, and in addition, at the end of the reaction the catalyst could be easily isolated and reused for the next reaction without any appreciable loss of its catalytic activity. The reused catalyst was also characterized by the FE-SEM and EDX techniques.
    Keywords: CuO NPs, Functionalize, Imidazolium, Multi-component reactions
  • Masoud Samandari, Afshin Tagvamanesh *, Seyed Ali Hosseini, Sakineh Mansouri Pages 175-180
    The wet peroxide oxidation (CWPO) of phenol in the polluted water on Mg-Al nano mixed oxide was investigated and the optimization and kinetic of the process were studied. The nanocatalyst was characterized by XRD, FESEM, EDS and BET. The average crystallite size of 25 nm was estimated using Scherrer formula.FESEM images approved the catalyst comprised of spherical nanoparticles in the range of 94-130 nm. BET results indicated the mesoporous nanocatalyst (dpore=21 nm) has a specific surface area of 86.3 m2.g-1. The optimized conditions of the process resulted at initial concentration of phenol, reaction temperature, reaction time and hydrogen peroxide volume of 100 ppm, 60ºC, 55 min and 3 mL, respectively. The phenol degradation under the optimal conditions reached 85%. The result of the kinetic study indicated that the oxidation of phenol over Mg-Al nano mixed oxide follows the pseudo-first-order kinetics with a correlation factor of 0.94. The activation energy of phenol oxidation over the catalyst was determined to be 19.07 kJ.mol-1. The Mg-Al mixed oxide is a cheap and green catalyst and could be prove to promising for the CWPO process.
    Keywords: Wet peroxide oxidation, phenol, Mg-Al mixed nanooxide, Kinetic studies, activation energy
  • Neda Raeisi Kheirabadi, Alireza Nezamzadeh Ejhieh *, Hamidreza Aghaei Pages 181-189

    A modified carbon paste electrode with NiO nanoparticles showed an excellent electrocatalytic behavior towards loratadine in the voltammetric and chronoamperometric approaches. Typical plots of IC/IL vs. t1/2 were contracted, and an average rate constant of 185.5 ± 2.2 M−1 s−1 was obtained from the slope of the curve. The geometric surface area of the electrode was 0.0314 cm2, and an average D-value of (1.11×10−3 ± 1.16×10−4) m2 s−1 was obtained for the diffusion of loratadine (Lor) towards the electrode surface. When the effective surface area (0.245 cm2) was used in calculations, an average D-value of (1.83×10−5 ± 1.96×10−6) cm2 s−1 was obtained. ∆I response is the peak current difference of the electrode at a fixed time when Lor analyte was added, and it is in proportion to the loratadine concentration in the range of 20-1000 nM. The limit of detection (LOD) and the limit of quantification (LOQ) of the method were 1.4 and 4.7 nM Lor when the 3Sb/m and 10Sb/m criteria were used, respectively.

    Keywords: Loratadine, Chronoamperometry, Electrocatalysis, Electro-oxidation, Carbon paste electrode
  • Maryam Mansouri * Pages 191-197
    Maryam Mansouri was born in 1996 in Ilam/Iran. Having graduated in the field of chemical industry engineering (2016) from Vali-asr University, Tehran, Iran, She continued Her M.Sc. in 2017 in Organic Chemistry under the supervision of Professor Davood Habibi. Her research interest is the design, synthesis, and characterization of task-specific biological-based catalysts and their applications in organic transformations.
    Keywords: Hydrogen-bond, organocatalyzed, enantioselectivity, Brønsted acids
  • Morteza Torabi * Pages 199-205
    Morteza Torabi was born in 1995 in Hamedan, Iran. He received his B.Sc. in Applied Chemistry (2017) and M.Sc. in Organic Chemistry (2019) from Bu-Ali Sina University under the supervision of Professor Mohammad Ali Zolfigol. He is currently working towards his Ph.D. under the supervision of Professor Mohammad Ali Zolfigol at Bu-Ali Sina University. His research interest is the design, synthesis and characterization of acidic magnetic nanoparticles, magnetic ionic liquids, and urea based compound as catalysts and their applications in organic synthesis.
    Keywords: Supramolecular catalysis, Noncovalent intermolecular forces
  • Hassan Sepehrmansourie * Pages 207-215
    Hassan Sepehrmansourie was born in Hamedan, Iran in 1994. He received his B.Sc. in Applied Chemistry (2017) from Bu-Ali Sina University, Iran. He received his M.Sc.in Organic Chemistry (2019) under the supervision of Prof. Mohammad Ali Zolfigol. He was also accepted into a Ph.D program. in organic chemistry at the Bu-Ali Sina University in the same year. His research interest is the synthesis, characterization and applications of homogeneous and heterogeneous reagents and catalysts in organic synthesis.
    Keywords: Metal Organic Frameworks (MOFs), Multi-purpose catalysts