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Reactive characteristics and adsorption heat of Ni/ZnO–SiO2–Al2O3 adsorbent by reactive adsorption desulfurization / Gang Wang in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12449-12459 Titre : Reactive characteristics and adsorption heat of Ni/ZnO–SiO2–Al2O3 adsorbent by reactive adsorption desulfurization Type de document : texte imprimé Auteurs : Gang Wang, Auteur ; Yaoshun Wen, Auteur ; Jingxin Fan, Auteur Année de publication : 2012 Article en page(s) : pp. 12449-12459 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Desulfurization  Adsorption Résumé : Reactive adsorption desulfurization (RADS) experiments of fluid catalytic cracking (FCC) gasoline and a model gasoline over an Ni/ZnO–SiO2–Al2O3 adsorbent were carried out in a fixed-fluidized bed reactor at low pressures in an H2 atmosphere. The results show that hydrogenation, hydrogen transfer, and polymerization reactions accompany RADS. Sulfidation and carbon deposits, which can lead to decreases in the regeneration rate and amount of activated Ni, are crucial to the decay of desulfurization and the olefin-hydrogenation capability of the adsorbents. The obvious reduction of C5 and C6 olefins in FCC gasoline mainly contribute to the drop in octane number of the desulfurization product. The desulfurization experiment on model gasoline and the adsorption heats of model compounds show that RADS removes sulfur from sulfur-containing compound through S–M interactions rather than by π-complexation over the Ni/ZnO–SiO2–Al2O3 adsorbent. The adsorption heat of sulfur-containing compound is proportional to the electron density of sulfur atoms. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745718 [article] Reactive characteristics and adsorption heat of Ni/ZnO–SiO2–Al2O3 adsorbent by reactive adsorption desulfurization [texte imprimé] / Gang Wang, Auteur ; Yaoshun Wen, Auteur ; Jingxin Fan, Auteur . - 2012 . - pp. 12449-12459. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12449-12459 Mots-clés : Desulfurization  Adsorption Résumé : Reactive adsorption desulfurization (RADS) experiments of fluid catalytic cracking (FCC) gasoline and a model gasoline over an Ni/ZnO–SiO2–Al2O3 adsorbent were carried out in a fixed-fluidized bed reactor at low pressures in an H2 atmosphere. The results show that hydrogenation, hydrogen transfer, and polymerization reactions accompany RADS. Sulfidation and carbon deposits, which can lead to decreases in the regeneration rate and amount of activated Ni, are crucial to the decay of desulfurization and the olefin-hydrogenation capability of the adsorbents. The obvious reduction of C5 and C6 olefins in FCC gasoline mainly contribute to the drop in octane number of the desulfurization product. The desulfurization experiment on model gasoline and the adsorption heats of model compounds show that RADS removes sulfur from sulfur-containing compound through S–M interactions rather than by π-complexation over the Ni/ZnO–SiO2–Al2O3 adsorbent. The adsorption heat of sulfur-containing compound is proportional to the electron density of sulfur atoms. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745718

Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization / Yaoshun Wen in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3939–3950 Titre : Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization Type de document : texte imprimé Auteurs : Yaoshun Wen, Auteur ; Gang Wang, Auteur ; Qian Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 3939–3950 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics  Adsorbent  Desulfurization Résumé : Regeneration experiments on Ni/ZnO–SiO2–Al2O3 adsorbents for gasoline reactive adsorption desulfurization (RADS) were carried out in a fixed-bed microreactor at atmosphere pressure. X-ray diffraction, scanning electron microscopy/energy-dispersive spectroscopy, X-ray photoelectron spectrometry, and N2 isotherms were used to identify changes in the physical and chemical properties of the adsorbent before and after regeneration. The results showed that high O2 concentrations significantly increase the regeneration rate of the adsorbent but yield zinc sulfate. A regeneration condition that decreases the formation of zinc sulfate, including low O2 concentration with high temperature, was then investigated. Finally, a shrinking core model (SCM) was applied to account for the regeneration kinetics of the Ni/ZnO–SiO2–Al2O3 adsorbent, and the relevant kinetic parameters were determined. The regeneration is controlled first by a chemical reaction and then by layer diffusion. The desulfurization activity of the regenerated adsorbent over three desulfurization and regeneration cycles is almost identical to that of fresh adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202730w [article] Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization [texte imprimé] / Yaoshun Wen, Auteur ; Gang Wang, Auteur ; Qian Wang, Auteur . - 2012 . - pp. 3939–3950. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3939–3950 Mots-clés : Kinetics  Adsorbent  Desulfurization Résumé : Regeneration experiments on Ni/ZnO–SiO2–Al2O3 adsorbents for gasoline reactive adsorption desulfurization (RADS) were carried out in a fixed-bed microreactor at atmosphere pressure. X-ray diffraction, scanning electron microscopy/energy-dispersive spectroscopy, X-ray photoelectron spectrometry, and N2 isotherms were used to identify changes in the physical and chemical properties of the adsorbent before and after regeneration. The results showed that high O2 concentrations significantly increase the regeneration rate of the adsorbent but yield zinc sulfate. A regeneration condition that decreases the formation of zinc sulfate, including low O2 concentration with high temperature, was then investigated. Finally, a shrinking core model (SCM) was applied to account for the regeneration kinetics of the Ni/ZnO–SiO2–Al2O3 adsorbent, and the relevant kinetic parameters were determined. The regeneration is controlled first by a chemical reaction and then by layer diffusion. The desulfurization activity of the regenerated adsorbent over three desulfurization and regeneration cycles is almost identical to that of fresh adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202730w