Documents disponibles écrits par cet auteur

Conversion of fluorine - containing ozone - depleting and greenhouse gases to valuable polymers in a nonthermal plasma / Eric M. Kennedy in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11279-11283 Titre : Conversion of fluorine - containing ozone - depleting and greenhouse gases to valuable polymers in a nonthermal plasma Type de document : texte imprimé Auteurs : Eric M. Kennedy, Auteur ; Sazal K. Kundu, Auteur ; John C. Mackie, Auteur Année de publication : 2012 Article en page(s) : pp. 11279-11283 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Non  thermal  plasma  Greenhouse  gas Résumé : A dielectric barrier discharge (DBD) nonthermal plasma was used to convert a range of fluorocarbons into useful polymeric products. Reactions were conducted at atmospheric pressure, in an argon bath gas and where methane was added as reactant. The bulk gas temperature was less than 150 °C and yielded polymers from a number of methane/fluorocarbon mixtures, including fluorocarbons such as halons, chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs). The results of gel permeation chromatography (GPC) reveal that a potentially valuable polymer is synthesized, with a number average molecular weight of between 60 000 and 130 000 g mol―1 and a polydispersity index (PDI) of between 1.2 and 2.9, depending on the fluorochemical converted. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299455 [article] Conversion of fluorine - containing ozone - depleting and greenhouse gases to valuable polymers in a nonthermal plasma [texte imprimé] / Eric M. Kennedy, Auteur ; Sazal K. Kundu, Auteur ; John C. Mackie, Auteur . - 2012 . - pp. 11279-11283. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11279-11283 Mots-clés : Non  thermal  plasma  Greenhouse  gas Résumé : A dielectric barrier discharge (DBD) nonthermal plasma was used to convert a range of fluorocarbons into useful polymeric products. Reactions were conducted at atmospheric pressure, in an argon bath gas and where methane was added as reactant. The bulk gas temperature was less than 150 °C and yielded polymers from a number of methane/fluorocarbon mixtures, including fluorocarbons such as halons, chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs). The results of gel permeation chromatography (GPC) reveal that a potentially valuable polymer is synthesized, with a number average molecular weight of between 60 000 and 130 000 g mol―1 and a polydispersity index (PDI) of between 1.2 and 2.9, depending on the fluorochemical converted. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299455

Effect of methanol on the gas-phase reaction of trifluoromethane with methane / Wenfeng Han in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8406–8414 Titre : Effect of methanol on the gas-phase reaction of trifluoromethane with methane Type de document : texte imprimé Auteurs : Wenfeng Han, Auteur ; Eric M. Kennedy, Auteur ; John C. Mackie, Auteur Année de publication : 2010 Article en page(s) : pp. 8406–8414 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gaseous  phase  reaction Résumé : The reaction of CHF3 with CH4 in the presence of small amounts of CH3OH (5% of CHF3 concentration) was investigated in a tubular alumina reactor at temperatures between 900 K and 1150 K. The presence of CH3OH has a significant influence on both the conversion and selectivity of the reaction. Increasing the CH3OH concentration enhances the conversion of CHF3 by a factor of 1−4 times at temperatures between 873 K and 1123 K, although the rate of formation of the major products (CH2═CF2) does not increase. A reaction scheme, based on NIST HFC and GRI-Mech mechanisms, is developed to model the reactions. Satisfactory agreement between experimental results and predictions is achieved for the conversion of reactants and formation of products. Based on experimental measurements and modeling results, a detailed reaction mechanism is proposed, and insight into how CH3OH influences the reaction of CHF3 with CH4 is presented. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23213974 [article] Effect of methanol on the gas-phase reaction of trifluoromethane with methane [texte imprimé] / Wenfeng Han, Auteur ; Eric M. Kennedy, Auteur ; John C. Mackie, Auteur . - 2010 . - pp. 8406–8414. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8406–8414 Mots-clés : Gaseous  phase  reaction Résumé : The reaction of CHF3 with CH4 in the presence of small amounts of CH3OH (5% of CHF3 concentration) was investigated in a tubular alumina reactor at temperatures between 900 K and 1150 K. The presence of CH3OH has a significant influence on both the conversion and selectivity of the reaction. Increasing the CH3OH concentration enhances the conversion of CHF3 by a factor of 1−4 times at temperatures between 873 K and 1123 K, although the rate of formation of the major products (CH2═CF2) does not increase. A reaction scheme, based on NIST HFC and GRI-Mech mechanisms, is developed to model the reactions. Satisfactory agreement between experimental results and predictions is achieved for the conversion of reactants and formation of products. Based on experimental measurements and modeling results, a detailed reaction mechanism is proposed, and insight into how CH3OH influences the reaction of CHF3 with CH4 is presented. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23213974

Identification and quantitation of volatile organic compounds from oxidation of linseed oil / Juita in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5645-5652 Titre : Identification and quantitation of volatile organic compounds from oxidation of linseed oil Type de document : texte imprimé Auteurs : Juita, Auteur ; Bogdan Z. Dlugogorski, Auteur ; Eric M. Kennedy, Auteur Année de publication : 2012 Article en page(s) : pp. 5645-5652 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidation  Volatile  organic  compound Résumé : Solid phase microextraction (SPME) combined with gas chromatography-mass spectrometry (GC-MS) served to identify and quantitate the volatile organic compounds (VOCs) formed in the degradative oxidation of linseed oil. SPME involved experiments under nitrogen and oxygen atmosphere, two oil types (raw and boiled), and two different methods of sampling the head space to differentiate between the oxidation products and the oil impurities. Further experiments entailed the oxidation of neat linoleic and linolenic acids to assist with the development of a detailed reaction mechanism. The majority of the detected product species originated from the oxidation of linolenic compounds, which dominate the composition of linseed oil, while 2-propenal, pentanal, hexanal, 2,4-decadienal, and hexanoic acid, among others, were released from linoleic compounds. The concentration of hexanal (7-26), 2-pentenal (25-39), 1-penten-3-ol (3.1-4.8), trans,trans-2,4-heptadienal (33-50), trans,trans-2,4-decadienal (0.7-0.8), 3,5-octadien-2-one (2.5-6.2; relative area), ethanoic acid (137-195), and hexanoic acid (18-29) increased with the progress of oxidation; the numbers in the parentheses indicate initial and final concentration (ppm) of the species in the oil in 6 h experiments. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834476 [article] Identification and quantitation of volatile organic compounds from oxidation of linseed oil [texte imprimé] / Juita, Auteur ; Bogdan Z. Dlugogorski, Auteur ; Eric M. Kennedy, Auteur . - 2012 . - pp. 5645-5652. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5645-5652 Mots-clés : Oxidation  Volatile  organic  compound Résumé : Solid phase microextraction (SPME) combined with gas chromatography-mass spectrometry (GC-MS) served to identify and quantitate the volatile organic compounds (VOCs) formed in the degradative oxidation of linseed oil. SPME involved experiments under nitrogen and oxygen atmosphere, two oil types (raw and boiled), and two different methods of sampling the head space to differentiate between the oxidation products and the oil impurities. Further experiments entailed the oxidation of neat linoleic and linolenic acids to assist with the development of a detailed reaction mechanism. The majority of the detected product species originated from the oxidation of linolenic compounds, which dominate the composition of linseed oil, while 2-propenal, pentanal, hexanal, 2,4-decadienal, and hexanoic acid, among others, were released from linoleic compounds. The concentration of hexanal (7-26), 2-pentenal (25-39), 1-penten-3-ol (3.1-4.8), trans,trans-2,4-heptadienal (33-50), trans,trans-2,4-decadienal (0.7-0.8), 3,5-octadien-2-one (2.5-6.2; relative area), ethanoic acid (137-195), and hexanoic acid (18-29) increased with the progress of oxidation; the numbers in the parentheses indicate initial and final concentration (ppm) of the species in the oil in 6 h experiments. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834476

Mechanism of formation of volatile organic compounds from oxidation of linseed oil / Juita in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5653-5661 Titre : Mechanism of formation of volatile organic compounds from oxidation of linseed oil Type de document : texte imprimé Auteurs : Juita, Auteur ; Bogdan Z. Dlugogorski, Auteur ; Eric M. Kennedy, Auteur Année de publication : 2012 Article en page(s) : pp. 5653-5661 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidation  Volatile  organic  compound Résumé : The pathways of volatile organic compound (VOC) formation have been investigated through a computational study, employing the Gaussian 03 suite of programs. We optimized geometries and zero-point vibrational energies (ZPVEs) at the B3LYP/6-31G(d) level of theory and improved electronic energies by conducting single-point energy calculations using the large 6-311++G(3df,3pd) basis set. To describe the predominant mechanism of the linseed oil oxidation, the following sequence is proposed: hydrogen abstraction of unsaturated fatty compounds as the initiation reaction followed by the reaction of allylic-type radicals with molecular oxygen to form peroxyl radicals and finally intramolecular rearrangement through four- and five-membered rings. Quantum calculations identified low-energy pathways following cyclization resulting in the formation of major products observed, especially aldehydes and ketones. The overall energy changes taking place through the four- and five-membered rings were found to be 78 and 93 kJ mol-1 exothermic, respectively. Metal catalysts decompose hydroperoxides based on the Fenton-like mechanism into alkoxyl and peroxyl radicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834477 [article] Mechanism of formation of volatile organic compounds from oxidation of linseed oil [texte imprimé] / Juita, Auteur ; Bogdan Z. Dlugogorski, Auteur ; Eric M. Kennedy, Auteur . - 2012 . - pp. 5653-5661. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5653-5661 Mots-clés : Oxidation  Volatile  organic  compound Résumé : The pathways of volatile organic compound (VOC) formation have been investigated through a computational study, employing the Gaussian 03 suite of programs. We optimized geometries and zero-point vibrational energies (ZPVEs) at the B3LYP/6-31G(d) level of theory and improved electronic energies by conducting single-point energy calculations using the large 6-311++G(3df,3pd) basis set. To describe the predominant mechanism of the linseed oil oxidation, the following sequence is proposed: hydrogen abstraction of unsaturated fatty compounds as the initiation reaction followed by the reaction of allylic-type radicals with molecular oxygen to form peroxyl radicals and finally intramolecular rearrangement through four- and five-membered rings. Quantum calculations identified low-energy pathways following cyclization resulting in the formation of major products observed, especially aldehydes and ketones. The overall energy changes taking place through the four- and five-membered rings were found to be 78 and 93 kJ mol-1 exothermic, respectively. Metal catalysts decompose hydroperoxides based on the Fenton-like mechanism into alkoxyl and peroxyl radicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834477

Mechanistic study of trapping of NO by 3,5-dibromo-4-nitrosobenzene sulfonate / Wendy K. P. F. Venpin in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14325-14336 Titre : Mechanistic study of trapping of NO by 3,5-dibromo-4-nitrosobenzene sulfonate Type de document : texte imprimé Auteurs : Wendy K. P. F. Venpin, Auteur ; Eric M. Kennedy, Auteur ; John C. Mackie, Auteur Année de publication : 2013 Article en page(s) : pp. 14325-14336 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Trapping Résumé : The aromatic spin trap 3,5-dibromo-4-nitrosobenzene sulfonate (DBNBS) is an efficient nitric oxide scavenger that has the potential to be employed for the control of NOx emissions from industrial processes. In the present study, we examined the in situ reaction of DBNBS with nitric oxide (NO), generated via the reduction of nitrite under acidic conditions at room temperature. Significant quantities of N2 were detected during the reaction using the membrane inlet mass spectrometer (MIMS), which suggested the homolytic cleavage of the C—N bond of a diazenyl radical, formed by decomposition of a DBNBS-NO adduct is a key reaction step which occurs during trapping. Measurements by nanostructured assisted laser desorption ionization mass spectrometer (NALDI-MS) established that the primary product from the reaction was 3,4,5-trinitrobenzene sulfonate, with a molecular weight of 291.880 amu. The technique also disclosed the formation of other nitrobenzene products. The results obtained in the present study provide evidence of a new, competing reaction pathway occurring in the presence of added nitrite, whereby a nitro group is introduced in the aromatic system by coupling with a phenyl radical to yield a radical anion, which reacts readily with the electrophile N2O3, also present in the system. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620345 [article] Mechanistic study of trapping of NO by 3,5-dibromo-4-nitrosobenzene sulfonate [texte imprimé] / Wendy K. P. F. Venpin, Auteur ; Eric M. Kennedy, Auteur ; John C. Mackie, Auteur . - 2013 . - pp. 14325-14336. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14325-14336 Mots-clés : Trapping Résumé : The aromatic spin trap 3,5-dibromo-4-nitrosobenzene sulfonate (DBNBS) is an efficient nitric oxide scavenger that has the potential to be employed for the control of NOx emissions from industrial processes. In the present study, we examined the in situ reaction of DBNBS with nitric oxide (NO), generated via the reduction of nitrite under acidic conditions at room temperature. Significant quantities of N2 were detected during the reaction using the membrane inlet mass spectrometer (MIMS), which suggested the homolytic cleavage of the C—N bond of a diazenyl radical, formed by decomposition of a DBNBS-NO adduct is a key reaction step which occurs during trapping. Measurements by nanostructured assisted laser desorption ionization mass spectrometer (NALDI-MS) established that the primary product from the reaction was 3,4,5-trinitrobenzene sulfonate, with a molecular weight of 291.880 amu. The technique also disclosed the formation of other nitrobenzene products. The results obtained in the present study provide evidence of a new, competing reaction pathway occurring in the presence of added nitrite, whereby a nitro group is introduced in the aromatic system by coupling with a phenyl radical to yield a radical anion, which reacts readily with the electrophile N2O3, also present in the system. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620345

Synthesis of vinylidene fluoride via reaction of chlorodifluoromethane (HCFC - 22) with methane / Wenfeng Han in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

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