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De - emulsification of kerosene / water emulsions with plate - type microchannels / Xiao Chen 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. 9279–9288 Titre : De - emulsification of kerosene / water emulsions with plate - type microchannels Type de document : texte imprimé Auteurs : Xiao Chen, Auteur ; Houfang Lu, Auteur ; Wei Jiang, Auteur Année de publication : 2010 Article en page(s) : pp. 9279–9288 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microchannels  Emulsions Résumé : Kerosene-in-water emulsions were de-emulsified by narrow plate-type microchannels. The emulsions with different Sauter diameters of 5 or 10 μm were formed by high-shear homogenization method and passed through microchannels with clearances of 100 to 200 μm. The de-emulsification efficiency was from 10% to 30% in a single pass through the channel. By repeatedly passing through the microchannels, up to 90% de-emulsification efficiency can be achieved. The results showed that the de-emulsification efficiency was influenced by the flow rate, Sauter diameter, microchannel size, and wall materials. Hydrophobic surface of the microchannel improved the de-emulsification efficiency. A coupled two-step mechanism was proposed to illustrate the de-emulsification process. Specially, polytetrafluoroethylene−stainless steel (PTFE-SS) plate combination of the microchannel induced different velocities of the continuous phase close to the wall surface and helped the droplets of the emulsion move toward the PTFE wall and be captured. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1005228 [article] De - emulsification of kerosene / water emulsions with plate - type microchannels [texte imprimé] / Xiao Chen, Auteur ; Houfang Lu, Auteur ; Wei Jiang, Auteur . - 2010 . - pp. 9279–9288. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9279–9288 Mots-clés : Microchannels  Emulsions Résumé : Kerosene-in-water emulsions were de-emulsified by narrow plate-type microchannels. The emulsions with different Sauter diameters of 5 or 10 μm were formed by high-shear homogenization method and passed through microchannels with clearances of 100 to 200 μm. The de-emulsification efficiency was from 10% to 30% in a single pass through the channel. By repeatedly passing through the microchannels, up to 90% de-emulsification efficiency can be achieved. The results showed that the de-emulsification efficiency was influenced by the flow rate, Sauter diameter, microchannel size, and wall materials. Hydrophobic surface of the microchannel improved the de-emulsification efficiency. A coupled two-step mechanism was proposed to illustrate the de-emulsification process. Specially, polytetrafluoroethylene−stainless steel (PTFE-SS) plate combination of the microchannel induced different velocities of the continuous phase close to the wall surface and helped the droplets of the emulsion move toward the PTFE wall and be captured. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1005228

Nickel – silicon intermetallics with enhanced selectivity in hydrogenation reactions of cinnamaldehyde and phenylacetylene / Xiao Chen in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3604-3611 Titre : Nickel – silicon intermetallics with enhanced selectivity in hydrogenation reactions of cinnamaldehyde and phenylacetylene Type de document : texte imprimé Auteurs : Xiao Chen, Auteur ; Miao Li, Auteur ; Jingchao Guan, Auteur Année de publication : 2012 Article en page(s) : pp. 3604-3611 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrogenation Résumé : Nickel―silicon intermetallics have been prepared by a direct silicification method using SiH4 as the silicon source. The prepared nickel―silicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel―silicon intermetallics was investigated. Nickel―silicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel―silicon intermetallics and oxygen atoms in the C=O bond of cinnamaldehyde. In addition, nickel-silicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595787 [article] Nickel – silicon intermetallics with enhanced selectivity in hydrogenation reactions of cinnamaldehyde and phenylacetylene [texte imprimé] / Xiao Chen, Auteur ; Miao Li, Auteur ; Jingchao Guan, Auteur . - 2012 . - pp. 3604-3611. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3604-3611 Mots-clés : Hydrogenation Résumé : Nickel―silicon intermetallics have been prepared by a direct silicification method using SiH4 as the silicon source. The prepared nickel―silicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel―silicon intermetallics was investigated. Nickel―silicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel―silicon intermetallics and oxygen atoms in the C=O bond of cinnamaldehyde. In addition, nickel-silicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595787