Documents disponibles écrits par cet auteur

Analysis of carbonaceous solid deposits from thermal oxidative stressing of jet-a fuel on iron- and nickel-based alloy surfaces / Arun Ram Mohan in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2722–2730 Titre : Analysis of carbonaceous solid deposits from thermal oxidative stressing of jet-a fuel on iron- and nickel-based alloy surfaces Type de document : texte imprimé Auteurs : Arun Ram Mohan, Auteur ; Semih Eser, Auteur Année de publication : 2010 Article en page(s) : pp. 2722–2730 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Carbonaceous;  Solid  Deposits;  Thermal  Oxidative;  Jet-A  Fuel;  Nickel;  Surfaces;  Based  Alloy Résumé : Thermal stressing of Jet-A was conducted in a flow reactor on iron- and nickel-based metal surfaces at a fuel flow rate of 1 mL/min for 5 h at a wall temperature of 350 °C and 3.5 MPa (500 psig) so that both liquid-phase autoxidation and thermal decomposition of autoxidation products contribute to the formation of carbonaceous deposits. The deposits produced were characterized by field emission scanning electron microscopy (FESEM) and temperature programmed oxidation (TPO). The effect of metal surface on deposit formation increases in the following order: AISI316 < AISI 321 ≈ AISI 304 < Inconel 600 < AISI 347 < Inconel 718 < FecrAlloy < Inconel-750X. The variation in the activity of the metal substrates is attributed to their reaction with reactive sulfur compounds in the fuel and interaction of oxygenated intermediates formed by autoxidation during thermal stressing. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901283r [article] Analysis of carbonaceous solid deposits from thermal oxidative stressing of jet-a fuel on iron- and nickel-based alloy surfaces [texte imprimé] / Arun Ram Mohan, Auteur ; Semih Eser, Auteur . - 2010 . - pp. 2722–2730. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2722–2730 Mots-clés : Carbonaceous;  Solid  Deposits;  Thermal  Oxidative;  Jet-A  Fuel;  Nickel;  Surfaces;  Based  Alloy Résumé : Thermal stressing of Jet-A was conducted in a flow reactor on iron- and nickel-based metal surfaces at a fuel flow rate of 1 mL/min for 5 h at a wall temperature of 350 °C and 3.5 MPa (500 psig) so that both liquid-phase autoxidation and thermal decomposition of autoxidation products contribute to the formation of carbonaceous deposits. The deposits produced were characterized by field emission scanning electron microscopy (FESEM) and temperature programmed oxidation (TPO). The effect of metal surface on deposit formation increases in the following order: AISI316 < AISI 321 ≈ AISI 304 < Inconel 600 < AISI 347 < Inconel 718 < FecrAlloy < Inconel-750X. The variation in the activity of the metal substrates is attributed to their reaction with reactive sulfur compounds in the fuel and interaction of oxygenated intermediates formed by autoxidation during thermal stressing. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901283r

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

Effectiveness of low-pressure metal-organic chemical vapor deposition coatings on metal surfaces for the mitigation of fouling from heated jet fuel / Arun Ram Mohan in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7290-7304 Titre : Effectiveness of low-pressure metal-organic chemical vapor deposition coatings on metal surfaces for the mitigation of fouling from heated jet fuel Type de document : texte imprimé Auteurs : Arun Ram Mohan, Auteur ; Semih Eser, Auteur Année de publication : 2011 Article en page(s) : pp. 7290-7304 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fuel  Fouling  Pollution  abatement  Chemical  vapor  deposition Résumé : Thin films of alumina, zirconia, tantalum oxide, and platinum were deposited on AIS1304 by metal―organic chemical vapor deposition to investigate the effectiveness of these coatings in inhibiting carbon deposition and sulfide formation from thermal oxidative degradation of jet fuel. Coated AISI304 foils were heated in a laboratory scale flow reactor with a commercial jet fuel (Jet-A) flowing at 1 mL/min at a wall temperature of 350 °C and reactor pressure of 500 psig (3.4 MPa) for 5 h. Under these conditions, both liquid phase autoxidation and thermal decomposition of jet fuel contribute to carbon deposition. The surface composition of the metal oxide coatings was found by X-ray photoelectron spectroscopy. The morphology of the coating and the carbonaceous deposits formed during thermal stressing were examined by field emission scanning electron microscopy. The amount of solid carbonaceous deposits on the coated and uncoated surfaces was measured by temperature-programmed oxidation. The effectiveness of the coatings in mitigating carbon deposition was found to decrease in the following order: platinum > Ta2O5 > alumina from acetyl acetonate > ZrO2 > alumina from aluminum trisecondary butoxide > AISI304. The coatings cover the metal surface by forming a protective layer that inhibits the formation of metal sulfides from the reaction of sulfur compounds in jet fuel with iron and nickel on stainless steel and inconel surfaces, respectively. The variation in the activity of the coatings can be attributed to the interaction of oxygenated intermediates formed by autoxidation during thermal stressing with coating surfaces having different degrees of acidity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239043 [article] Effectiveness of low-pressure metal-organic chemical vapor deposition coatings on metal surfaces for the mitigation of fouling from heated jet fuel [texte imprimé] / Arun Ram Mohan, Auteur ; Semih Eser, Auteur . - 2011 . - pp. 7290-7304. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7290-7304 Mots-clés : Fuel  Fouling  Pollution  abatement  Chemical  vapor  deposition Résumé : Thin films of alumina, zirconia, tantalum oxide, and platinum were deposited on AIS1304 by metal―organic chemical vapor deposition to investigate the effectiveness of these coatings in inhibiting carbon deposition and sulfide formation from thermal oxidative degradation of jet fuel. Coated AISI304 foils were heated in a laboratory scale flow reactor with a commercial jet fuel (Jet-A) flowing at 1 mL/min at a wall temperature of 350 °C and reactor pressure of 500 psig (3.4 MPa) for 5 h. Under these conditions, both liquid phase autoxidation and thermal decomposition of jet fuel contribute to carbon deposition. The surface composition of the metal oxide coatings was found by X-ray photoelectron spectroscopy. The morphology of the coating and the carbonaceous deposits formed during thermal stressing were examined by field emission scanning electron microscopy. The amount of solid carbonaceous deposits on the coated and uncoated surfaces was measured by temperature-programmed oxidation. The effectiveness of the coatings in mitigating carbon deposition was found to decrease in the following order: platinum > Ta2O5 > alumina from acetyl acetonate > ZrO2 > alumina from aluminum trisecondary butoxide > AISI304. The coatings cover the metal surface by forming a protective layer that inhibits the formation of metal sulfides from the reaction of sulfur compounds in jet fuel with iron and nickel on stainless steel and inconel surfaces, respectively. The variation in the activity of the coatings can be attributed to the interaction of oxygenated intermediates formed by autoxidation during thermal stressing with coating surfaces having different degrees of acidity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239043