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Catalytic cracking and coking of supercritical n - dodecane in microchannel coated with HZSM - 5 zeolites / Fanxu Meng in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8977–8983 Titre : Catalytic cracking and coking of supercritical n - dodecane in microchannel coated with HZSM - 5 zeolites Type de document : texte imprimé Auteurs : Fanxu Meng, Auteur ; Guozhu Liu, Auteur ; Shudong Qu, Auteur Année de publication : 2010 Article en page(s) : pp. 8977–8983 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrocarbon  fuels  Thermal  catalytic  cracking  Microchannel Résumé : To improve the cracking rate of supercritical hydrocarbon fuels, HZSM-5 coating was prepared over the inner surface of microchannels reactors by the washcoating method. Thermal or catalytic cracking of n-dodecane, a model compound of hydrocarbon fuels, was experimentally investigated in the stainless steel microchannel coated with HZSM-5 coatings under supercritical conditions (p > 4 MPa, T > 450 °C). It is found that cracking of n-dodecane was enhanced more than 100% by HZSM-5 coatings in 30 min reaction durations at 525 and 550 °C despite gradual deactivations of catalytic activities due to conversion coke from pyrolysis and acid-catalyzed reaction. Cokes deposited on the microchannels with and without HZSM-5 coating were characterized by scanning electron microscopy (SEM) and temperature-programmed oxidation (TPO), indicating that HZSM-5 coating effectively reduces formation of filamentous cokes and its damage on the micro channel surface by shielding surface metals when the temperature is higher than 600 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101158w [article] Catalytic cracking and coking of supercritical n - dodecane in microchannel coated with HZSM - 5 zeolites [texte imprimé] / Fanxu Meng, Auteur ; Guozhu Liu, Auteur ; Shudong Qu, Auteur . - 2010 . - pp. 8977–8983. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8977–8983 Mots-clés : Hydrocarbon  fuels  Thermal  catalytic  cracking  Microchannel Résumé : To improve the cracking rate of supercritical hydrocarbon fuels, HZSM-5 coating was prepared over the inner surface of microchannels reactors by the washcoating method. Thermal or catalytic cracking of n-dodecane, a model compound of hydrocarbon fuels, was experimentally investigated in the stainless steel microchannel coated with HZSM-5 coatings under supercritical conditions (p > 4 MPa, T > 450 °C). It is found that cracking of n-dodecane was enhanced more than 100% by HZSM-5 coatings in 30 min reaction durations at 525 and 550 °C despite gradual deactivations of catalytic activities due to conversion coke from pyrolysis and acid-catalyzed reaction. Cokes deposited on the microchannels with and without HZSM-5 coating were characterized by scanning electron microscopy (SEM) and temperature-programmed oxidation (TPO), indicating that HZSM-5 coating effectively reduces formation of filamentous cokes and its damage on the micro channel surface by shielding surface metals when the temperature is higher than 600 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101158w

New method of catalytic cracking of hydrocarbon fuels using a highly dispersed nano-HZSM-5 catalyst / Shiguo Bao in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3972–3975 Titre : New method of catalytic cracking of hydrocarbon fuels using a highly dispersed nano-HZSM-5 catalyst Type de document : texte imprimé Auteurs : Shiguo Bao, Auteur ; Guozhu Liu, Auteur ; Xiangwen Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 3972–3975 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Catalytic  Cracking  Hydrocarbon  Fuels  Highly  Dispersed  Nano Résumé : A pseudohomogeneous method of catalytic cracking of hydrocarbon fuels using a highly dispersed nano-HZSM-5 catalyst is developed. Hydrophilic nano-HZSM-5 is transformed into a hydrophobic form via organic silanization of the zeolite surface, which makes it dispersible in a model endothermic fuel such as n-dodecane. Compared with thermal cracking, catalytic cracking of n-dodecane with highly dispersed nano-HZSM-5 catalyst exhibits remarkably enhanced conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901801q [article] New method of catalytic cracking of hydrocarbon fuels using a highly dispersed nano-HZSM-5 catalyst [texte imprimé] / Shiguo Bao, Auteur ; Guozhu Liu, Auteur ; Xiangwen Zhang, Auteur . - 2010 . - pp. 3972–3975. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3972–3975 Mots-clés : Catalytic  Cracking  Hydrocarbon  Fuels  Highly  Dispersed  Nano Résumé : A pseudohomogeneous method of catalytic cracking of hydrocarbon fuels using a highly dispersed nano-HZSM-5 catalyst is developed. Hydrophilic nano-HZSM-5 is transformed into a hydrophobic form via organic silanization of the zeolite surface, which makes it dispersible in a model endothermic fuel such as n-dodecane. Compared with thermal cracking, catalytic cracking of n-dodecane with highly dispersed nano-HZSM-5 catalyst exhibits remarkably enhanced conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901801q

On the critical points of thermally cracked hydrocarbon fuels under high pressure / Rongpei Jiang in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9456-9465 Titre : On the critical points of thermally cracked hydrocarbon fuels under high pressure Type de document : texte imprimé Auteurs : Rongpei Jiang, Auteur ; Guozhu Liu, Auteur ; Zhiqiang You, Auteur Année de publication : 2011 Article en page(s) : pp. 9456-9465 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fuel  Crack  Critical  point Résumé : Thermal cracking of a series of model compounds (n-octane, n-decane, n-dodecane, cydohexane, methylcyclohexane), as well as a commercial Chinese jet fuel RP-3, was performed in a flowing reactor consisting of an electrically heated tube under a pressure of 5 MPa to obtain the chemical compositions of the cracked hydrocarbon fuels at different levels of cracking conversion. The phase envelopes and critical points of the cracked hydrocarbon fuels were calculated using the Peng-Robinson and Soave-Redlich-Kwong equations. The calculation results showed that the critical points for cracked hydrocarbon fuels are strongly dependent on the hydrocarbon type and cracking conversion and that the critical temperature of cracked fuel decreases but the critical pressure increases sharply from 2—4 to above 10 MPa because of the appearance of many small-molecule products. Therefore, phase changes of the hydrocarbon fuel from compressed liquid phase to supercritical phase and then to gas phase possibly occurred in the electrically heated tube reactor when the cracking conversions exceeded 30%. Based on the calculation results, the supercritical cracking of hydrocarbon fuels should be carefully used at higher cracking conversions of hydrocarbon fuels under high pressure. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395891 [article] On the critical points of thermally cracked hydrocarbon fuels under high pressure [texte imprimé] / Rongpei Jiang, Auteur ; Guozhu Liu, Auteur ; Zhiqiang You, Auteur . - 2011 . - pp. 9456-9465. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9456-9465 Mots-clés : Fuel  Crack  Critical  point Résumé : Thermal cracking of a series of model compounds (n-octane, n-decane, n-dodecane, cydohexane, methylcyclohexane), as well as a commercial Chinese jet fuel RP-3, was performed in a flowing reactor consisting of an electrically heated tube under a pressure of 5 MPa to obtain the chemical compositions of the cracked hydrocarbon fuels at different levels of cracking conversion. The phase envelopes and critical points of the cracked hydrocarbon fuels were calculated using the Peng-Robinson and Soave-Redlich-Kwong equations. The calculation results showed that the critical points for cracked hydrocarbon fuels are strongly dependent on the hydrocarbon type and cracking conversion and that the critical temperature of cracked fuel decreases but the critical pressure increases sharply from 2—4 to above 10 MPa because of the appearance of many small-molecule products. Therefore, phase changes of the hydrocarbon fuel from compressed liquid phase to supercritical phase and then to gas phase possibly occurred in the electrically heated tube reactor when the cracking conversions exceeded 30%. Based on the calculation results, the supercritical cracking of hydrocarbon fuels should be carefully used at higher cracking conversions of hydrocarbon fuels under high pressure. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395891

Roles of hydrogen donors and organic selenides in inhibiting solid deposits from thermal stressing of n-dodecane and chinese RP-3 jet fuel / Wei Guo in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8320–8327 Titre : Roles of hydrogen donors and organic selenides in inhibiting solid deposits from thermal stressing of n-dodecane and chinese RP-3 jet fuel Type de document : texte imprimé Auteurs : Wei Guo, Auteur ; Xiangwen Zhang, Auteur ; Guozhu Liu, Auteur Année de publication : 2010 Article en page(s) : pp. 8320–8327 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrocarbon  fuels  Hydrogen  donors  Organic  selenides Résumé : Use of hydrocarbon fuels as coolants for future high-Mach aircraft is challenged by the formation of carbonaceous deposits during thermal stressing at high temperatures (>500 °C). Three hydrogen donors, tetralin (THN), α-tetralone (THNone), and benzyl alcohol (BzOH), and two organic selenides, diphenyl selenide (Ph2Se) and diphenyl diselenide (Ph2Se2), as well as their mixtures, are selected as thermally stable additives to inhibit the deposition from the thermal stressing of n-dodecane and Chinese RP-3 (No. 3 jet fuel). It is found that the amount of solid deposits from thermal stressing of RP-3 is reduced by 77.0% with the additive of Ph2Se2/THN/THNone. The carbonaceous solid is further characterized using temperature-programmed oxidation (TPO), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). It is revealed that hydrogen donor THN/THNone and organic selenides possibly reduce the carbon deposits through retarding the thermal cracking rate, blocking surface catalysis, and depressing reactivity of sulfur with the surface metals, as well as their synergistic effect. The morphologies of deposits also dramatically change after adding organic selenides or hydrogen donors. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900735c [article] Roles of hydrogen donors and organic selenides in inhibiting solid deposits from thermal stressing of n-dodecane and chinese RP-3 jet fuel [texte imprimé] / Wei Guo, Auteur ; Xiangwen Zhang, Auteur ; Guozhu Liu, Auteur . - 2010 . - pp. 8320–8327. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8320–8327 Mots-clés : Hydrocarbon  fuels  Hydrogen  donors  Organic  selenides Résumé : Use of hydrocarbon fuels as coolants for future high-Mach aircraft is challenged by the formation of carbonaceous deposits during thermal stressing at high temperatures (>500 °C). Three hydrogen donors, tetralin (THN), α-tetralone (THNone), and benzyl alcohol (BzOH), and two organic selenides, diphenyl selenide (Ph2Se) and diphenyl diselenide (Ph2Se2), as well as their mixtures, are selected as thermally stable additives to inhibit the deposition from the thermal stressing of n-dodecane and Chinese RP-3 (No. 3 jet fuel). It is found that the amount of solid deposits from thermal stressing of RP-3 is reduced by 77.0% with the additive of Ph2Se2/THN/THNone. The carbonaceous solid is further characterized using temperature-programmed oxidation (TPO), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). It is revealed that hydrogen donor THN/THNone and organic selenides possibly reduce the carbon deposits through retarding the thermal cracking rate, blocking surface catalysis, and depressing reactivity of sulfur with the surface metals, as well as their synergistic effect. The morphologies of deposits also dramatically change after adding organic selenides or hydrogen donors. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900735c