فهرست مطالب

Catalysis - Volume:2 Issue: 2, Spring 2012

Iranian Journal of Catalysis
Volume:2 Issue: 2, Spring 2012

  • تاریخ انتشار: 1391/08/25
  • تعداد عناوین: 8
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  • Hamid Reza Pouretedal, Sara Basati Pages 51-55
    Mesoporous photocatalysts of CeO2/SBA-15 are prepared by two methods of direct synthesis as solvent-usage and solvent-free methods. In solvent-usage method, CeO2/SBA-15 is synthesized in acidic media. While, in solvent-free method, CeO2/SBA-15, has been prepared through the novel path of directly grind cerium salt into the as-prepared samples of SBA-15 occluded with template. This method enables a large amount of cerium to be highly dispersed in the channels of mesoporous silica, also saves time and energy. The resulting composites exhibit photocatalytic activity, and the dispersed CeO2 in SBA-15 illustrates a photodegradation of Congo red (CR) in aqueous solution. X-ray powder diffraction, N2 adsorption-desorption and FT-IR spectroscopy are used to characterize the prepared materials.
    Keywords: CeO2, SBA, 15, Photocatalyst, Congo red (CR), Nanoparticles
  • Farhad Shirini, Kourosh Ramoghadam, Tahereh Naghdi Pages 57-61
    This paper describes the applicability of 1,3-dichloro-5,5-dimethylhydantoin, as a cheap, stable and commercially available catalyst, in the promotion of the synthesis of 1,8-dioxo-octahydro-xanthenes (DOXOs) via the one-pot condensation of aldehydes and cyclic 1,3-dicarbonyl compounds. This novel synthetic method has the advantages of high yields, short reaction times, low cost and availability of the catalyst, solvent-free reaction conditions, simplicity and easy work-up compared to the conventional methods reported in the literature.
    Keywords: Aldehydes, 1, 8, Dioxo, octahydro, xanthenes, 1, 3, Dichloro, 5, 5, dimethylhydantoin, Cyclic 1, 3, dicarbonyl compounds, Solvent, free conditions
  • Leila Khazdooz, Amin Zarei, Abdol R. Hajipour, Nafisehsadat Sheikhan Pages 63-68
    An efficient, mild and environmentally friendly method was developed for the Strecker reaction to synthesize α-aminonitriles in the presence of methyl imidazolium hydrogen sulfate ([Hmim][HSO4]) as an efficient catalyst. These syntheses were performed via a one-pot three-component condensation of aldehydes (or ketones), amines, and trimethylsilyl cyanide under mild and solvent free conditions.
    Keywords: Strecker, α, Amino nitriles, Methyl imidazolium hydrogen sulfate, Solvent free conditions
  • Khodabakhsh Niknam, Shekoofeh Tayebi Pages 69-74
    The one-pot, multi-component synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) by tandem Knoevenagel-Michael reaction of phenylhydrazine, ethyl acetoacetate and aldehydes in the presence of silica-bonded N-propylpiperazine sulfamic acid (SBPPSA) as a recyclable solid acid catalyst was reported. SBPPSA showed much the same efficiency when used in consecutive reaction runs.
    Keywords: Silica, bonded N, propylpiperazine sulfamic acid, Catalyst, Aldehydes, 4, 4′, (Arylmethylene)bis(1H, pyrazol, 5, ols), Multi, component reactions
  • Bibi Fatemeh Mirjalili, Abdolhamid Bamoniri, Abbas Ali Jafari, Fatemeh Abasaltian Pages 75-78
    Silica supported phosphorus pentoxide (P2O5•SiO2) is an efficient catalyst for synthesis of 1,3,5-substituted pyrazoles via the condensation of 1,3-diketones and hydrazines. Simplicity of procedure, mild condition, being solvent-free, high yields, and easy workup are some advantages of this protocol.
    Keywords: P2O5.SiO2, 1, 3, 5, tri, substituted pyrazoles, 1, 3, diketones, Hydrazines, Solvent, free
  • Alireza Nezamzadeh-Ejhieh, Zohreh Banan Pages 79-83
    In this research, zeolite A was synthesized from waste porcelain and CdS nano-particles were doped in zeolite framework by a precipitation after an ion exchanging process. All raw and modified samples were characterized by FT-IR, XRD and SEM methods. Primary experiments showed that the good efficiency of loaded nano CdS onto the zeolite A for photodecomposition of dimethyldisulfide (DMDS) under UV irradiation. Hence the effect of some experimental parameters on the kinetics of the photodegradation experiments was studied and the optimal conditions were found as: pH 3, 3 g L–1 of the catalyst and 8 ppm of DMDS concentration. UV-Vis spectrophotometric measurements were performed to determine the degradation extent. The degradation process obeyed first-order kinetics.
    Keywords: Zeolite A, Dimethydisulfide, CdS nanoparticles, Heterogeneous catalysis
  • Jalal Albadi, Nasir Iravani, Moloud Khoshakhlagh Pages 85-89
    Poly(4-vinylpyridine)-supported copper iodide nanoparticles is reported as a new, green and recyclable catalyst for the synthesis of aryl-14H-dibenzo [a-o] xanthenes under solvent-free conditions. This catalyst can be recovered by simple filtration and recycled up to 8 consecutive runs without any loss of their efficiency.
    Keywords: Poly(4, vinylpyridine), Supported, β, naphthol, aryl, 14H, dibenzo [a, o] xanthenes, Nanoparticles, Copper catalysis, Solvent, free conditions
  • Arash Shokrolahi, Abbas Zali, Mohammad Ali Zarei, Karim Esmaeilpour Pages 91-94
    A simple and efficient procedure has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones derivatives under solvent-free conditions. This method uses the condensation of isatoic anhydride, aldehydes, and amines in the presence of a catalytic amount Sulfonated Porous Carbon (SPC). One of the important advantages of the new method is that the SPC could be recycled and reused.
    Keywords: Heterogeneous catalysis, Sulfonated Porous Carbon, Solid acid, 2, 3 dihydroquinazolin, 4(1H), ones