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Ultradeep hydrodesulfurization and adsorptive desulfurization of diesel fuel on metal-rich nickel phosphides / Miron V. Landau in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5239–5249 Titre : Ultradeep hydrodesulfurization and adsorptive desulfurization of diesel fuel on metal-rich nickel phosphides Type de document : texte imprimé Auteurs : Miron V. Landau, Auteur ; Moti Herskowitz, Auteur ; Tali Hoffman, Auteur Année de publication : 2009 Article en page(s) : pp. 5239–5249 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Silica  gel  Diesel  fuel  Hydrodesulfurization  Adsorptive  desulfurization  TPR  methods Résumé : Three materials containing Ni2P, Ni12P5, and Ni3P phases on silica gel with surface area 320 m2/g at loadings of 32−37 wt % and the crystal size of NixP phases 30, 9, and 13 nm, respectively, were prepared by a combination of impregnation and TPR methods and tested in hydrodesulfurization (HDS) and adsorptive desulfurization (ADS) of diesel fuel. There were established opposite trends in changing the DS efficiency in two processes: The HDS rate constant decreased while the ADS sulfur capacity (breakthrough at 1 ppmw) increased with increasing the Ni to P ratio in NixP from 2 to 3. The observed behavior was attributed to the specific features of the densities of states (DOS) obtained from the density functional theory calculations of total and partial DOS for Ni and P in NixP phases and revealed in XPS measurements of binding energy of Ni 2p3/2- and P 2p-electrons. This attribution was consistent with the analysis of the relative part of d-electrons of Ni participating in bonding with p-electrons of phosphorus in these phases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000579 [article] Ultradeep hydrodesulfurization and adsorptive desulfurization of diesel fuel on metal-rich nickel phosphides [texte imprimé] / Miron V. Landau, Auteur ; Moti Herskowitz, Auteur ; Tali Hoffman, Auteur . - 2009 . - pp. 5239–5249. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5239–5249 Mots-clés : Silica  gel  Diesel  fuel  Hydrodesulfurization  Adsorptive  desulfurization  TPR  methods Résumé : Three materials containing Ni2P, Ni12P5, and Ni3P phases on silica gel with surface area 320 m2/g at loadings of 32−37 wt % and the crystal size of NixP phases 30, 9, and 13 nm, respectively, were prepared by a combination of impregnation and TPR methods and tested in hydrodesulfurization (HDS) and adsorptive desulfurization (ADS) of diesel fuel. There were established opposite trends in changing the DS efficiency in two processes: The HDS rate constant decreased while the ADS sulfur capacity (breakthrough at 1 ppmw) increased with increasing the Ni to P ratio in NixP from 2 to 3. The observed behavior was attributed to the specific features of the densities of states (DOS) obtained from the density functional theory calculations of total and partial DOS for Ni and P in NixP phases and revealed in XPS measurements of binding energy of Ni 2p3/2- and P 2p-electrons. This attribution was consistent with the analysis of the relative part of d-electrons of Ni participating in bonding with p-electrons of phosphorus in these phases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000579