Synthesis, characterization and evaluation of unsupported porous NiS2 sub-micrometer spheres as a potential hydrodesulfurization catalyst

Authors: Debajyoti Mondal, Gilles Villemure, Guangchun Li, Chaojie Song, Jiujun Zhang, Rob Hui, Jinwen Chen, Craig Fairbridge

Abstract:
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 N₂ adsorption/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.

Keywords:
Nickel disulfide
Ultrasonic spray pyrolysis
Hydrodesulfurization
Dibenzothiophene

Published in: Applied catalysis A: General  (Volume 450, Pages 1-274, 15 January 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Synthesis, characterization and evaluation of unsupported porous NiS2 sub-micrometer spheres as a potential hydrodesulfurization catalyst

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