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Volume 11, Issue 1 (9-2015)
Abstract
Mixed spinel nanocrystals have captured the attention of scientist in the field for their catalytic activity in decomposition of hydrogen peroxide. In this study nanocatalysts MnFe2O4, Co3O4, Pb3O4, Co0.5Zn0.5Fe2O4 and Co0.5Mn0.5Fe2O4 were synthesized by co-precipitation method. The synthetic samples were characterized by XRD patterns, SEM images and IR spectroscopy. The size of the nanoparticles was calculated from the Scherrer equation and XRD patterns. Nanocatalysts were tested for the decomposition of hydrogen peroxide. The catalytic activity of these nanocrystals was determined by the oxygen volumetric technique. Decomposition of hydrogen was examined by produced nanocatalysts and as a result lead oxide and cobalt oxide nanocatalysts were selected as dopant in MnFe2O4 nanocrystal structure. The results indicated significant superiority of lead oxide upon cobalt oxide because lead oxide caused to release 100 ml O2 gas within 90 seconds while cobalt oxide released it during 100 seconds. The catalytic activity of three-component spinel ferrites was studied and the results showed excessive activity of two-component compared with three-component spinel.
Dr Mojtaba Mahyari, Mr Iman Shater Khabazi, Dr Fatemehe Abrishami, Dr Seyed Ghorban Hoseini,
Volume 17, Issue 2 (9-2022)
Abstract
In this paper, the effect of nanocatalytic metal-organic framework based on copper metal and bis-tetrazolamine (CuBTA) ligand functionalized with cobalt (II) oxide nanoparticles on the thermal decomposition behavior of ammonium perchlorate (AP), using differential survey calorimetry (DSC) has been reviewed. First, the metal-organic framework (CuBTA) was synthesized from the raw materials of copper chloride and bistetrazole amine using the solvothermal method and with the help of .... Then, using cobalt (II) nitrate and co-precipitation method, the desired metal-organic framework was functionalized with cobalt (II) oxide nanoparticles. Fuzzy studies were performed with X-ray diffraction pattern (XRD) apparatus, as well as formation investigations using Fourier transform infrared spectroscopy (FT-IR). The results of thermal decomposition of ammonium perchlorate in the presence of metal-organic framework (CuBTA) and nanoparticle functionalized framework showed that 5% by weight of the catalyst, the thermal decomposition temperature of ammonium perchlorate was 34.1 °C and 91.1 °C. Reduced for the metal-organic framework and the metal-organic framework functionalized by nanoparticles, respectively. The combustion enthalpies of 1570 J.g-1 and 1375 J.g-1 were obtained in the same way.
