فهرس المقالات Nano perovskite

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  1 - Synthesis, characterization and first application of perovskite LaFeO3 nano particles for the synthesis of tetrahydropyridine derivatives
  Melika Eftekhar Iman Khosravi Vahid Jozari
  In this study, the perovskite-type LaFeO3 nanoparticles have been fabricated by sol–gel method and characterized by X-ray powder diffraction (XRD), Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (STM) and transmission electron microscopy (TEM) أکثر

  In this study, the perovskite-type LaFeO3 nanoparticles have been fabricated by sol–gel method and characterized by X-ray powder diffraction (XRD), Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (STM) and transmission electron microscopy (TEM). The average particle size of LaFeO3 is about 50 nm and the synthesis of tetrahydropyridine derivatives was investigated by the reaction of aryl aldehydes, aryl amines and ethyl acetoacetate in the presence of heterogeneous catalyst. The high efficiency, short time, the very simple separation of the catalyst from the reaction environment is the advantages of the above method. In addition, the catalyst can be reused and can be used for catalytic activity five times without significant reduction. تفاصيل المقالة
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  2 - Study of acetylation of benzylic alcohols over BiFeO3, Bi0.86Sm0.07Eu0.07FeO3, and Bi0.86Sm0.07Cd0.07FeO3 nano powders
  Seyed Ali Hosseini Elham Paknahad Abdolali Alemi Akbar Arkak
  BiFeO3 (BFO), Bi0.86Sm0.07Eu0.07FeO3 (BSEFO), and Bi0.86Sm0.07Cd0.07FeO3 (BSCFO) nano powders were prepared by the sol-gel combustion method and the catalytic performances were evaluated in the acetylation reaction of benzyl alcohol. The physical chemical properties of أکثر

  BiFeO3 (BFO), Bi0.86Sm0.07Eu0.07FeO3 (BSEFO), and Bi0.86Sm0.07Cd0.07FeO3 (BSCFO) nano powders were prepared by the sol-gel combustion method and the catalytic performances were evaluated in the acetylation reaction of benzyl alcohol. The physical chemical properties of the catalysts were characterized by using XRD, FT-IR, scanning electron microscope (SEM), EDX and BET surface. The efficient acetylation of benzyl alcohol was carried ‌out over all the nano powders using acetyl chloride/ acetonitrile at room temperature. Among the nano powders, BSCFO showed the highest catalytic performance and the yield of benzyl acetate was 89, 45, and 69 percent over BSCFO, BFO, and BSEFO, respectively. Partial substitution of Sm-Eu and Sm-Cd in bismuth ferrite improved the catalytic performance and increased the specific surface area of the catalysts. A direct relationship resulted between the catalytic performance and the specific surface of catalysts, where BSCFO with the highest surface area (11.7m2/g) exhibited the superior catalytic performance. The quantitative yield for the acetate product also resulted for the acetylation of p-methyl benzyl alcohol, p-nitro benzyl alcohol and p-chloro benzyl alcohol on BSCFO. The catalysts showed good reusability in the process. The study confirmed that the catalysts could be promising for the acetylation of alcohols. تفاصيل المقالة
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  3 - Study of catalytic performance of LaMnO3 and LaMnO3-ZSM-5 nanocatalysts toward 2-propanol conversion
  Seyed Ali Hosseini
  LaMnO3 and LaMnO3/ZSM-5 nano catalysts were synthesized by Pechini method and their physical-chemical properties were characterized using XRD, FTIR, SEM-EDX, UV-vis DRS, BET surface area and TPR. The correlation between characteristic properties and activity of catalyst أکثر

  LaMnO3 and LaMnO3/ZSM-5 nano catalysts were synthesized by Pechini method and their physical-chemical properties were characterized using XRD, FTIR, SEM-EDX, UV-vis DRS, BET surface area and TPR. The correlation between characteristic properties and activity of catalysts were investigated. The catalytic performance of the catalysts was evaluated in combustion of 2-propanol and compared with 1% Pt/Al2O3 performance. The results of SEM and UV-Vis DRS of LaMnO3/ZSM-5 indicated the well dispersion of the perovskite oxide on the support. The results of TPR indicated no direct correlation between the activity and reducibility of the catalysts. The catalytic studies revealed that the supporting of LaMnO3 increased the conversion rate of 2-propanol, which is ascribed to higher surface area, more availability of catalytic sites to probe molecules. In addition, the stability of LaMnO3/ZSM-5 was higher than that of LaMnO3 during a 10 h time on stream. The conversion rate of 2-propanol on the LaMnO3/ZSM-5 was higher even than that on the industrial 1%Pt/Al2O3 catalyst. The study showed that the perovskite/zeolite catalyst could be promising catalysts in the removal of VOCs. تفاصيل المقالة