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

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/j.apcata.2012.10.030
AuteurRechercher : 1; Rechercher : ; Rechercher : 1; Rechercher : 1; Rechercher : 1; Rechercher : 1; Rechercher : ; Rechercher :
Affiliation
  1. Conseil national de recherches du Canada. Énergie, les mines et l'environnement
FormatTexte, Article
SujetAdsorption/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
Résumé
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. © 2012 Published by Elsevier B.V.
Date de publication
Dans
  • Applied Catalysis A: General 450 (2013) : 230–236.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21269844
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Identificateur de l’enregistrementa7832f6f-46bb-46fc-ad12-8f516fe2ded6
Enregistrement créé2013-12-13
Enregistrement modifié2020-04-22
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