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Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization / D. Huang in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3870–3875 Titre : Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization Type de document : texte imprimé Auteurs : D. Huang, Auteur ; Y. C. Lu, Auteur ; Y. J. Wang, Auteur ; L. Yang, Auteur Année de publication : 2008 Article en page(s) : p. 3870–3875 Note générale : Bibliogr. p. 3874-3875 Langues : Anglais (eng) Mots-clés : Microreactor  system;  Dibenzothiophene;  Deep  desulfurization Résumé : In this paper, a microreactor system is developed to enhance the oxidation of dibenzothiophene (DBT) and 4,6-DMDBT for deep desulfurization with the oxidant of hydrogen peroxide. A T-junction microchannel was applied to form the aqueous slug flow and a long PTFE (polytetrafluoroethylene) capillary with an inner diameter of 1 mm was connected directly downstream to maintain the two-phase dispersion condition. Surfactant of octadecyltrimethyl ammonium bromide (STAB) and phosphotungstic acid (TPA) were mixed in the microchannel to form the combined amphiphilic catalyst directly. The parameters affecting slug formation and DBT oxidation were investigated, including two-phase flow rates, temperature, surfactant type, and catalyst concentrations. DBT conversion of 97% was achieved with a residence time of 1.3 min at 60 °C. Furthermore, 4,6-DMDBT could also be effectively oxidized, and increasing the reaction temperature from 25 to 70 °C led to a substantial increase in 4,6-DMDBT conversions, from 57% at 25 °C to 97% at 70 °C. This T-junction microchannel reactor is far superior to the conventional equipment in terms of providing more interfacial area with much less power input. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701781r [article] Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization [texte imprimé] / D. Huang, Auteur ; Y. C. Lu, Auteur ; Y. J. Wang, Auteur ; L. Yang, Auteur . - 2008 . - p. 3870–3875. Bibliogr. p. 3874-3875 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3870–3875 Mots-clés : Microreactor  system;  Dibenzothiophene;  Deep  desulfurization Résumé : In this paper, a microreactor system is developed to enhance the oxidation of dibenzothiophene (DBT) and 4,6-DMDBT for deep desulfurization with the oxidant of hydrogen peroxide. A T-junction microchannel was applied to form the aqueous slug flow and a long PTFE (polytetrafluoroethylene) capillary with an inner diameter of 1 mm was connected directly downstream to maintain the two-phase dispersion condition. Surfactant of octadecyltrimethyl ammonium bromide (STAB) and phosphotungstic acid (TPA) were mixed in the microchannel to form the combined amphiphilic catalyst directly. The parameters affecting slug formation and DBT oxidation were investigated, including two-phase flow rates, temperature, surfactant type, and catalyst concentrations. DBT conversion of 97% was achieved with a residence time of 1.3 min at 60 °C. Furthermore, 4,6-DMDBT could also be effectively oxidized, and increasing the reaction temperature from 25 to 70 °C led to a substantial increase in 4,6-DMDBT conversions, from 57% at 25 °C to 97% at 70 °C. This T-junction microchannel reactor is far superior to the conventional equipment in terms of providing more interfacial area with much less power input. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701781r

Preparation and characterization of ultrathin palladium membranes / X. Li in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2061–2065 Titre : Preparation and characterization of ultrathin palladium membranes Type de document : texte imprimé Auteurs : X. Li, Auteur ; T. M. Liu, Auteur ; D. Huang, Auteur Année de publication : 2009 Article en page(s) : p. 2061–2065 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ultrathin  palladium  membrane  Photocatalytic  deposition  pretreatment  Electroless  modification  method Résumé : An ultrathin palladium membrane (1 μm) has been prepared by an improved photocatalytic deposition (PCD) pretreatment and the electroless modification method. SEM results demonstrated good adhesion of the plated palladium membrane on the porous composite TiO2 support and dense coalescence of the palladium membrane. The flux and H2/N2 selectivity of the palladium membrane were determined in the temperature range of 623−823 K and the pressure difference range of 0.02−0.15 MPa. At 673 K and 0.1 MPa pressure difference, the hydrogen permeation flux of the composite membrane was as high as 0.27 mol m−2 s−1, and the H2/N2 selectivity coefficient was 361. In this study, the activation energy of hydrogen permeation through the composite palladium membrane was 17 kJ/mol. The corrected pressure exponent for the palladium composite membrane was nearly 0.8 deviated from Sievert’s law. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004644 [article] Preparation and characterization of ultrathin palladium membranes [texte imprimé] / X. Li, Auteur ; T. M. Liu, Auteur ; D. Huang, Auteur . - 2009 . - p. 2061–2065. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2061–2065 Mots-clés : Ultrathin  palladium  membrane  Photocatalytic  deposition  pretreatment  Electroless  modification  method Résumé : An ultrathin palladium membrane (1 μm) has been prepared by an improved photocatalytic deposition (PCD) pretreatment and the electroless modification method. SEM results demonstrated good adhesion of the plated palladium membrane on the porous composite TiO2 support and dense coalescence of the palladium membrane. The flux and H2/N2 selectivity of the palladium membrane were determined in the temperature range of 623−823 K and the pressure difference range of 0.02−0.15 MPa. At 673 K and 0.1 MPa pressure difference, the hydrogen permeation flux of the composite membrane was as high as 0.27 mol m−2 s−1, and the H2/N2 selectivity coefficient was 361. In this study, the activation energy of hydrogen permeation through the composite palladium membrane was 17 kJ/mol. The corrected pressure exponent for the palladium composite membrane was nearly 0.8 deviated from Sievert’s law. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004644