• synthesis, characterization and evaluation of unsupported porous nis2 sub-micrometer spheres as a potential hydrodesulfurization catalyst

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1057
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    • شماره تماس دبیرخانه رویداد: -
     nanostructured nis2 has attracted interest due to its wide applications and special properties. synthesis of a pure phase nis2 in a single step has been a challenge. in this work, a new method for direct synthesis of uniform nis2/sio2 sub microspheres has been developed by ultrasonic spray pyrolysis. colloidal silica was used as a sacrificial template to create the porous structure. after silica removal, hollow, porous nis2 nano spheres were obtained. the product was characterized by using scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction (xrd), transmission electron microscopy and n2adsorption/desorption isotherm. xrd confirmed the formation of single phase pyrite nis2. it was found that the porous spherical nis2 has a surface area of ca. 300 m2 g−1. the hds catalytic activity of nis2 was evaluated using a model compound, dibenzothiophene (dbt). it showed a first order reaction rate constant of 1.51 × 10−4 s−1 g cata−1 at 320 °c for hds of dbt, which is significantly promising for further exploration.

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