Documents disponibles écrits par cet auteur

Characterization of solid deposits formed from jet fuel degradation under pyrolytic conditions / Ramya Venkataraman in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9351–9360 Titre : Characterization of solid deposits formed from jet fuel degradation under pyrolytic conditions : metal sulfides Type de document : texte imprimé Auteurs : Ramya Venkataraman, Auteur ; Semih Eser, Auteur Année de publication : 2009 Article en page(s) : p. 9351–9360 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Solid  deposits  Jet  fuel  Metal  sulfides Résumé : Reaction of the organic sulfur compounds in Jet A with Fe- and Ni-based alloy substrates under pyrolytic conditions formed significant amounts of metal sulfides. Pyrrhotite (Fe(1−x)S) and heazlewoodite (Ni3S2) were formed on SS316 and Inconel 600 surfaces, respectively, in the short duration experiments. After extended periods of thermal stressing, an additional crystal phase, pentlandite (Fe,Ni)9S8, was also observed on both surfaces. The lack of FeS2 (pyrite) formation over extended periods of stressing indicates that the amount of sulfur reacting with the substrates decreased with the increasing thermal stressing time. A focused ion beam (FIB)/SEM analysis showed that the metal sulfide formation can extend up to 2 μm depth from the surface in 2 h of thermal stressing. The formation of metal sulfides on alloy surfaces degrades the alloy surfaces and affects solid carbon deposition from jet fuel. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801007r [article] Characterization of solid deposits formed from jet fuel degradation under pyrolytic conditions : metal sulfides [texte imprimé] / Ramya Venkataraman, Auteur ; Semih Eser, Auteur . - 2009 . - p. 9351–9360. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9351–9360 Mots-clés : Solid  deposits  Jet  fuel  Metal  sulfides Résumé : Reaction of the organic sulfur compounds in Jet A with Fe- and Ni-based alloy substrates under pyrolytic conditions formed significant amounts of metal sulfides. Pyrrhotite (Fe(1−x)S) and heazlewoodite (Ni3S2) were formed on SS316 and Inconel 600 surfaces, respectively, in the short duration experiments. After extended periods of thermal stressing, an additional crystal phase, pentlandite (Fe,Ni)9S8, was also observed on both surfaces. The lack of FeS2 (pyrite) formation over extended periods of stressing indicates that the amount of sulfur reacting with the substrates decreased with the increasing thermal stressing time. A focused ion beam (FIB)/SEM analysis showed that the metal sulfide formation can extend up to 2 μm depth from the surface in 2 h of thermal stressing. The formation of metal sulfides on alloy surfaces degrades the alloy surfaces and affects solid carbon deposition from jet fuel. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801007r

Characterization of solid deposits formed from short durations of jet fuel degradation / Ramya Venkataraman in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9337–9350 Titre : Characterization of solid deposits formed from short durations of jet fuel degradation : carbonaceous solids Type de document : texte imprimé Auteurs : Ramya Venkataraman, Auteur ; Semih Eser, Auteur Année de publication : 2009 Article en page(s) : p. 9337–9350 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Solid  deposits  Jet  fuel  Carbonaceous  solids Résumé : The deposits formed after short durations of pyrolytic degradation consist of carbonaceous solids growing on metal sulfide particles. Carbonaceous solids contain amorphous films and uniformly sized spheroids. Close association of the carbonaceous film with the sulfide particles suggests that it was produced by a heterogeneous process similar to chemical vapor deposition (CVD), while the morphology of the spheroidal deposits suggests that they were formed by homogeneous nucleation and growth in the fluid phase. Thermal stressing on an alumina-coated SS316 surface and reducing the sulfur content of the jet fuel from 0.10 to 0.01 wt % inhibited metal sulfide formation on the surface. This consequently inhibited the growth of film deposits but not the nature or amount of fluid-phase deposits. These results have shown that the sulfur content of jet fuel and the substrate composition control the heterogeneous carbon deposition. These parameters do not affect the nucleation and growth of the fluid-phase deposits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010066 [article] Characterization of solid deposits formed from short durations of jet fuel degradation : carbonaceous solids [texte imprimé] / Ramya Venkataraman, Auteur ; Semih Eser, Auteur . - 2009 . - p. 9337–9350. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9337–9350 Mots-clés : Solid  deposits  Jet  fuel  Carbonaceous  solids Résumé : The deposits formed after short durations of pyrolytic degradation consist of carbonaceous solids growing on metal sulfide particles. Carbonaceous solids contain amorphous films and uniformly sized spheroids. Close association of the carbonaceous film with the sulfide particles suggests that it was produced by a heterogeneous process similar to chemical vapor deposition (CVD), while the morphology of the spheroidal deposits suggests that they were formed by homogeneous nucleation and growth in the fluid phase. Thermal stressing on an alumina-coated SS316 surface and reducing the sulfur content of the jet fuel from 0.10 to 0.01 wt % inhibited metal sulfide formation on the surface. This consequently inhibited the growth of film deposits but not the nature or amount of fluid-phase deposits. These results have shown that the sulfur content of jet fuel and the substrate composition control the heterogeneous carbon deposition. These parameters do not affect the nucleation and growth of the fluid-phase deposits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010066