Synthesis, characterization and evaluation of unsupported porous NiS 2 sub-micrometer spheres as a potential hydrodesulfurization catalyst

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DOIResolve DOI: http://doi.org/10.1016/j.apcata.2012.10.030
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TypeArticle
Journal titleApplied Catalysis A: General
ISSN0926-860X
Volume450
Pages230236; # of pages: 7
SubjectAdsorption/desorption; Colloidal silica; Dibenzothiophenes; Direct synthesis; Energy dispersive X ray spectroscopy; First-order reaction rate constant; HDS of DBT; Hydrodesulfurization catalysts; Model compound; Nano-structured; Porous structures; Silica removal; Single phase; Single-step; Special properties; Submicrometers; Surface area; Ultrasonic spray pyrolysis; XRD; Rate constants; Scanning electron microscopy; Silica; Spray pyrolysis; Transmission electron microscopy; X ray diffraction; X ray spectroscopy; Hydrodesulfurization
AbstractNanostructured 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. © 2012 Published by Elsevier B.V.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21269844
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Record identifiera7832f6f-46bb-46fc-ad12-8f516fe2ded6
Record created2013-12-13
Record modified2016-05-09
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