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Ultradeep adsorption-desulfurization of gasoline with Ni/Al-SiO2 material catalytically facilitated by ethanol / Miron V. Landau in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6904–6916 Titre : Ultradeep adsorption-desulfurization of gasoline with Ni/Al-SiO2 material catalytically facilitated by ethanol Type de document : texte imprimé Auteurs : Miron V. Landau, Auteur ; Moti Herskowitz, Auteur ; Rajeev Agnihotri, Auteur Année de publication : 2008 Article en page(s) : p. 6904–6916 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Low-sulfur  Adsorptive  desulfurization  Fixed  bed  Ni/Al-SiO2 Résumé : Adsorptive desulfurization of low-sulfur (22 ppmw) gasoline on solids in a liquid-full (no hydrogen) fixed bed was conducted at 503 K. Addition of 3 wt % ethanol to gasoline increased significantly the adsorption rate of sulfur-containing hydrocarbons on Ni/Al−SiO2 and its sulfur capacity, leading to <0.5 ppmw residual sulfur with a sulfur capacity of 2 wt % (mass of sulfur per mass of sorbent). Three potential routes for improving desulfurization performance of Ni sorbent in the presence of ethanol and its decomposition products containing CO and hydrogen were considered: (i) formation of nickel carbide (Ni3C) phase with reactivity toward S-organic compounds higher than that of metallic nickel, (ii) reduction of carbon deposits in the presence of hydrogen, and (iii) formation of nickel sulfide nanoparticles in the presence of H2/H2S vs adsorbed sulfur/sulfur organics that block the surface of metallic nickel in the absence of EtOH (hydrogen). Catalyst characterization data (N2 adsorption, XRD, EDX, HRTEM, FTIR, XPS, AES depth profile analysis) indicated that the effect of ethanol on the desulfurization performance was a result of reduction of coke deposition and changing the sulfur uptake mode from adsorption to reactive adsorption with the formation of bulk nickel sulfide phases Ni3S2 and Ni3S4. This is facilitated by hydrogen produced from the catalytic decomposition of ethanol that participates in the desulfurization of S-organics and in the formation of nickel sulfide phases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800590x [article] Ultradeep adsorption-desulfurization of gasoline with Ni/Al-SiO2 material catalytically facilitated by ethanol [texte imprimé] / Miron V. Landau, Auteur ; Moti Herskowitz, Auteur ; Rajeev Agnihotri, Auteur . - 2008 . - p. 6904–6916. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6904–6916 Mots-clés : Low-sulfur  Adsorptive  desulfurization  Fixed  bed  Ni/Al-SiO2 Résumé : Adsorptive desulfurization of low-sulfur (22 ppmw) gasoline on solids in a liquid-full (no hydrogen) fixed bed was conducted at 503 K. Addition of 3 wt % ethanol to gasoline increased significantly the adsorption rate of sulfur-containing hydrocarbons on Ni/Al−SiO2 and its sulfur capacity, leading to <0.5 ppmw residual sulfur with a sulfur capacity of 2 wt % (mass of sulfur per mass of sorbent). Three potential routes for improving desulfurization performance of Ni sorbent in the presence of ethanol and its decomposition products containing CO and hydrogen were considered: (i) formation of nickel carbide (Ni3C) phase with reactivity toward S-organic compounds higher than that of metallic nickel, (ii) reduction of carbon deposits in the presence of hydrogen, and (iii) formation of nickel sulfide nanoparticles in the presence of H2/H2S vs adsorbed sulfur/sulfur organics that block the surface of metallic nickel in the absence of EtOH (hydrogen). Catalyst characterization data (N2 adsorption, XRD, EDX, HRTEM, FTIR, XPS, AES depth profile analysis) indicated that the effect of ethanol on the desulfurization performance was a result of reduction of coke deposition and changing the sulfur uptake mode from adsorption to reactive adsorption with the formation of bulk nickel sulfide phases Ni3S2 and Ni3S4. This is facilitated by hydrogen produced from the catalytic decomposition of ethanol that participates in the desulfurization of S-organics and in the formation of nickel sulfide phases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800590x

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