Adsorption of sulfur compound utilizing rice husk ash modified with niobium

• Autor: Cavalcanti, Rodrigo M. ; Pessoa Júnior, Wanison A.G. ; Braga, Valdeilson S. ; Barros, Ivoneide de C.L.
• Assuntos: Adsorbents ; Adsorption ; Ashes ; Derivatives ; Diffraction ; Impregnation ; Kinetics ; Niobium pentoxide ; RHA ; Sulfur ; Surface chemistry ; Thiophene
• É parte de: Applied surface science, 2015-11, Vol.355, p.171-182
• Notas: ObjectType-Article-1
  SourceType-Scholarly Journals-1
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• Descrição: •Adsorbents based in RHA modified with niobium were prepared by impregnation.•The impregnation modified the particle size and topology of RHA particles.•The adsorbents were applied in sulfur removal in model liquid fuels.•The larger sulfur removal (>50%) was achieved using RHA with 5wt.% niobium oxide.•The adsorbent show great selectivity in adsorption experiments. Adsorbents based in rice husk ash (RHA) modified with niobium pentoxide were prepared for impregnation methods and applied in sulfur removal in liquid fuels. The solids were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, nitrogen physisorption and thermal analysis; they show that there was no qualitative change in the amorphous structure of the RHA; however, the method of impregnation could modify the particle size and topology of RHA particles. The larger sulfur removal (>50%) was achieved using RHA with 5wt.% Nb2O5 at a dosage of 10gL−1, after 4h of contact with the model fuel. The kinetic study of adsorption of thiophene showed that the models of pseudo-second order and intra-particle diffusion best fit the experimental data. The adsorption experiments with the thiophenic derivatives compounds show a large selectivity of the adsorbent.
  
• Editor: Elsevier B.V
  
• Idioma: Inglês