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Coupling conversion of methanol and C4 hydrocarbon to propylene on la-modified HZSM-5 zeolite catalysts / Ting Gong in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13589-13598 Titre : Coupling conversion of methanol and C4 hydrocarbon to propylene on la-modified HZSM-5 zeolite catalysts Type de document : texte imprimé Auteurs : Ting Gong, Auteur ; Xin Zhang, Auteur ; Ting Bai, Auteur Année de publication : 2012 Article en page(s) : pp. 13589-13598 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Zeolite Résumé : The coupling conversion of methanol and C4 hydrocarbon (62.2 wt % of n-butanes and 34.4 wt % of n-butylenes) to propylene was studied over La-modified HZSM-5 (La/HZSM-5) catalysts. Compared with the individual methanol to olefins and C4 hydrocarbon cracking to propylene, the coupling conversion remarkably improved propylene yield and the catalytic stability of La/HZSM-5. In the coupling conversion, propylene yield was strongly dependent on the reaction conditions and the loading of La. The interaction of La with hydroxyl groups (OH) adsorbed on HZSM-5 surface occurred. Such interaction modified the density and distribution of acid sites from the hydroxyl groups. Propylene yield was close relative to the density and distribution of acid sites. The comparatively high propylene yield of ca. 46.0 wt % was obtained on La/HZSM-5 catalyst with 1.5 wt % load of La (1.5 wt % La/HZSM-5), possibly due to the moderate density and distribution of acid sites on the catalyst. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508182 [article] Coupling conversion of methanol and C4 hydrocarbon to propylene on la-modified HZSM-5 zeolite catalysts [texte imprimé] / Ting Gong, Auteur ; Xin Zhang, Auteur ; Ting Bai, Auteur . - 2012 . - pp. 13589-13598. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13589-13598 Mots-clés : Catalyst  Zeolite Résumé : The coupling conversion of methanol and C4 hydrocarbon (62.2 wt % of n-butanes and 34.4 wt % of n-butylenes) to propylene was studied over La-modified HZSM-5 (La/HZSM-5) catalysts. Compared with the individual methanol to olefins and C4 hydrocarbon cracking to propylene, the coupling conversion remarkably improved propylene yield and the catalytic stability of La/HZSM-5. In the coupling conversion, propylene yield was strongly dependent on the reaction conditions and the loading of La. The interaction of La with hydroxyl groups (OH) adsorbed on HZSM-5 surface occurred. Such interaction modified the density and distribution of acid sites from the hydroxyl groups. Propylene yield was close relative to the density and distribution of acid sites. The comparatively high propylene yield of ca. 46.0 wt % was obtained on La/HZSM-5 catalyst with 1.5 wt % load of La (1.5 wt % La/HZSM-5), possibly due to the moderate density and distribution of acid sites on the catalyst. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508182

Flow physics of a race car wing with vortex generators in ground effect / Yuichi Kuya in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 12 (Décembre 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 12 (Décembre 2009) . - 09 p. Titre : Flow physics of a race car wing with vortex generators in ground effect Type de document : texte imprimé Auteurs : Yuichi Kuya, Auteur ; Kenji Takeda, Auteur ; Xin Zhang, Auteur Année de publication : 2010 Article en page(s) : 09 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : suction;  flow  visualization;  wakes;  vortices;  flow  (dynamics);  generators;  wings;  separation  (technology);  flow  separation;  physics Résumé : This paper experimentally investigates the use of vortex generators for separation control on an inverted wing in ground effect using off-surface flow measurements and surface flow visualization. A typical racing car wing geometry is tested in a rolling road wind tunnel over a wide range of incidences and ride heights. Rectangular vane type of sub-boundary layer and large-scale vortex generators are attached to the suction surface, comprising counter-rotating and corotating configurations. The effects of both device height and spacing are examined. The counter-rotating sub-boundary layer vortex generators and counter-rotating large-scale vortex generators suppress the flow separation at the center of each device pair, while the counter-rotating large-scale vortex generators induce horseshoe vortices between each device where the flow is separated. The corotating sub-boundary layer vortex generators tested here show little evidence of separation control. Increasing the spacing of the counter-rotating sublayer vortex generator induces significant horseshoe vortices, comparable to those seen in the counter-rotating large-scale vortex generator case. Wake surveys show significant spanwise variance behind the wing equipped with the counter-rotating large-scale vortex generators, while the counter-rotating sub-boundary layer vortex generator configuration shows a relatively small variance in the spanwise direction. The flow characteristics revealed here suggest that counter-rotating sub-boundary layer vortex generators can provide effective separation control for race car wings in ground effect. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Flow physics of a race car wing with vortex generators in ground effect [texte imprimé] / Yuichi Kuya, Auteur ; Kenji Takeda, Auteur ; Xin Zhang, Auteur . - 2010 . - 09 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 12 (Décembre 2009) . - 09 p. Mots-clés : suction;  flow  visualization;  wakes;  vortices;  flow  (dynamics);  generators;  wings;  separation  (technology);  flow  separation;  physics Résumé : This paper experimentally investigates the use of vortex generators for separation control on an inverted wing in ground effect using off-surface flow measurements and surface flow visualization. A typical racing car wing geometry is tested in a rolling road wind tunnel over a wide range of incidences and ride heights. Rectangular vane type of sub-boundary layer and large-scale vortex generators are attached to the suction surface, comprising counter-rotating and corotating configurations. The effects of both device height and spacing are examined. The counter-rotating sub-boundary layer vortex generators and counter-rotating large-scale vortex generators suppress the flow separation at the center of each device pair, while the counter-rotating large-scale vortex generators induce horseshoe vortices between each device where the flow is separated. The corotating sub-boundary layer vortex generators tested here show little evidence of separation control. Increasing the spacing of the counter-rotating sublayer vortex generator induces significant horseshoe vortices, comparable to those seen in the counter-rotating large-scale vortex generator case. Wake surveys show significant spanwise variance behind the wing equipped with the counter-rotating large-scale vortex generators, while the counter-rotating sub-boundary layer vortex generator configuration shows a relatively small variance in the spanwise direction. The flow characteristics revealed here suggest that counter-rotating sub-boundary layer vortex generators can provide effective separation control for race car wings in ground effect. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

Flow separation control on a race car wing with vortex generators in ground effect / Yuichi Kuya in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 12 (Décembre 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 12 (Décembre 2009) . - 08 p. Titre : Flow separation control on a race car wing with vortex generators in ground effect Type de document : texte imprimé Auteurs : Yuichi Kuya, Auteur ; Kenji Takeda, Auteur ; Xin Zhang, Auteur Année de publication : 2010 Article en page(s) : 08 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : flow  separation  control;  vortex  generators Résumé : Flow separation control using vortex generators on an inverted wing in ground effect is experimentally investigated, and its performance is characterized in terms of forces and pressure distributions over a range of incidence and ride height. Counter-rotating and co-rotating rectangular-vane type vortex generators are tested on the suction surface of the wing. The effect of device height and spacing is investigated. The counter-rotating sub-boundary layer vortex generators and counter-rotating large-scale vortex generators on the wing deliver 23% and 10% improvements in the maximum downforce, respectively, compared with the clean wing, at an incidence of one degree, and delay the onset of the downforce reduction phenomenon. The counter-rotating sub-boundary layer vortex generators exhibit up to 26% improvement in downforce and 10% improvement in aerodynamic efficiency at low ride heights. Chordwise pressure measurement confirms that both counter-rotating vortex generator configurations suppress flow separation, while the co-rotating vortex generators exhibit negligible effectiveness. This work shows that a use of vortex generators, notably of the counter-rotating sub-boundary layer vortex generator type, can be effective at controlling flow separation, with a resultant improvement in downforce for relatively low drag penalty. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Flow separation control on a race car wing with vortex generators in ground effect [texte imprimé] / Yuichi Kuya, Auteur ; Kenji Takeda, Auteur ; Xin Zhang, Auteur . - 2010 . - 08 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 12 (Décembre 2009) . - 08 p. Mots-clés : flow  separation  control;  vortex  generators Résumé : Flow separation control using vortex generators on an inverted wing in ground effect is experimentally investigated, and its performance is characterized in terms of forces and pressure distributions over a range of incidence and ride height. Counter-rotating and co-rotating rectangular-vane type vortex generators are tested on the suction surface of the wing. The effect of device height and spacing is investigated. The counter-rotating sub-boundary layer vortex generators and counter-rotating large-scale vortex generators on the wing deliver 23% and 10% improvements in the maximum downforce, respectively, compared with the clean wing, at an incidence of one degree, and delay the onset of the downforce reduction phenomenon. The counter-rotating sub-boundary layer vortex generators exhibit up to 26% improvement in downforce and 10% improvement in aerodynamic efficiency at low ride heights. Chordwise pressure measurement confirms that both counter-rotating vortex generator configurations suppress flow separation, while the co-rotating vortex generators exhibit negligible effectiveness. This work shows that a use of vortex generators, notably of the counter-rotating sub-boundary layer vortex generator type, can be effective at controlling flow separation, with a resultant improvement in downforce for relatively low drag penalty. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]