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Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid / Shu Wang in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4561–4565 Titre : Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid Type de document : texte imprimé Auteurs : Shu Wang, Auteur ; Bo Yang, Auteur ; Tingting Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 4561–4565 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous  solution  Catalyst  Formic  acid Résumé : Palladized foam nickel (Pd/Ni) catalyst was prepared by replacement deposition and employed to hydrodechlorinate 4-chlorophenol (4-CP) with formic acid (FA). 4-CP was rapidly transformed to phenol by means of hydrogenolysis. Major factors that may influence the 4-CP conversion rate, including the Pd loading amount, FA dosage, and solution pH value, were investigated. A moderate Pd loading amount (1.0 wt %), an excess of FA dosage (FA/4-CP ratio of 51.4:1), and a relatively low pH (4.0) were found to be the optimal operational conditions under which 4-CP was degraded up to 96.2% within 2 h and the catalytic activity of Pd/Ni reduced negligibly after three recycles. The dechlorination pathway is postulated as follows: (1) HCOOH (or HCOO−) decomposed on Pd particles with atomic hydrogen ([H]) generated; (2) [H] served as the direct reducing agent in the hydrodechlorination of 4-CP adsorbed on both Pd particles and Ni substrate, through the radical mechanism. Pd/Ni is found to be a promising catalyst in the elimination of organochlorines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005194 [article] Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid [texte imprimé] / Shu Wang, Auteur ; Bo Yang, Auteur ; Tingting Zhang, Auteur . - 2010 . - pp. 4561–4565. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4561–4565 Mots-clés : Aqueous  solution  Catalyst  Formic  acid Résumé : Palladized foam nickel (Pd/Ni) catalyst was prepared by replacement deposition and employed to hydrodechlorinate 4-chlorophenol (4-CP) with formic acid (FA). 4-CP was rapidly transformed to phenol by means of hydrogenolysis. Major factors that may influence the 4-CP conversion rate, including the Pd loading amount, FA dosage, and solution pH value, were investigated. A moderate Pd loading amount (1.0 wt %), an excess of FA dosage (FA/4-CP ratio of 51.4:1), and a relatively low pH (4.0) were found to be the optimal operational conditions under which 4-CP was degraded up to 96.2% within 2 h and the catalytic activity of Pd/Ni reduced negligibly after three recycles. The dechlorination pathway is postulated as follows: (1) HCOOH (or HCOO−) decomposed on Pd particles with atomic hydrogen ([H]) generated; (2) [H] served as the direct reducing agent in the hydrodechlorination of 4-CP adsorbed on both Pd particles and Ni substrate, through the radical mechanism. Pd/Ni is found to be a promising catalyst in the elimination of organochlorines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005194

Numerical model of a tandem reciprocating hydraulic rod seal / Bo Yang in Transactions of the ASME . Journal of tribology, Vol. 130 n°3 (Juillet 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 7 p. Titre : Numerical model of a tandem reciprocating hydraulic rod seal Type de document : texte imprimé Auteurs : Bo Yang, Auteur ; Richard F. Salant, Auteur Année de publication : 2008 Article en page(s) : 7 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Fluid  mechanics  Deformation  Computer  simulation  Surface  roughness  Sealing  (Process)  Contact  mechanics  Steady  state  Leakage  Pressure  Fluids Résumé : A numerical model of a tandem reciprocating hydraulic rod seal, consisting of two elastomeric U cup seals, has been constructed. It is applicable to cases in which the stroke length is significantly larger than the seal width. The model consists of coupled steady state fluid mechanics, deformation mechanics, and contact mechanics analyses, with an iterative computational procedure. The behaviors of the two seals are coupled through the pressure∕density in the interseal region and through flow continuity. Results for a typical tandem seal are compared to those of a single seal and a double lip seal. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468077 [article] Numerical model of a tandem reciprocating hydraulic rod seal [texte imprimé] / Bo Yang, Auteur ; Richard F. Salant, Auteur . - 2008 . - 7 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 7 p. Mots-clés : Fluid  mechanics  Deformation  Computer  simulation  Surface  roughness  Sealing  (Process)  Contact  mechanics  Steady  state  Leakage  Pressure  Fluids Résumé : A numerical model of a tandem reciprocating hydraulic rod seal, consisting of two elastomeric U cup seals, has been constructed. It is applicable to cases in which the stroke length is significantly larger than the seal width. The model consists of coupled steady state fluid mechanics, deformation mechanics, and contact mechanics analyses, with an iterative computational procedure. The behaviors of the two seals are coupled through the pressure∕density in the interseal region and through flow continuity. Results for a typical tandem seal are compared to those of a single seal and a double lip seal. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468077

Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost / Xiao-Sen Li in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4424-4432 Titre : Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost Type de document : texte imprimé Auteurs : Xiao-Sen Li, Auteur ; Bo Yang, Auteur ; Gang Li, Auteur Année de publication : 2012 Article en page(s) : pp. 4424-4432 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mountain  Depressurization  Gas  hydrates  Natural  gas  Production  Numerical  simulation Résumé : In November 2008, gas hydrate samples were recovered during the scientific expedition conducted in the Qilian Mountain Permafrost It is expected that this area will become a strategic area of gas hydrate production in China. However, the evaluation of the hydrate deposits in the area as a potential energy resource has not been completed. Using numerical simulation and currently available data from site measurements, we preliminarily estimate the gas production potential of these hydrate reservoirs. The cumulative volume of the produced CH4 at the well in the early production period (0―10 years) is more than 50% of the total gas production from the well. The gas hydrate dissociation mainly occurs in the vicinity of the horizontal well and along a cylindrical interface. There is a ringlike structure of ice around the horizontal well during the gas production process. With the decrease of the gas production rate, the ice starts to melt from the bottom to the top under the influence of the geothermal gradient The sensitivity analysis demonstrates the dependence of production on the intrinsic permeability and the initial deposit temperature. Economic assessment based on the cumulative volumetric gas production and the gas-to-water ratio indicates that it is not economically viable to produce gas from this hydrate deposit using single horizontal well by depressurization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655650 [article] Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost [texte imprimé] / Xiao-Sen Li, Auteur ; Bo Yang, Auteur ; Gang Li, Auteur . - 2012 . - pp. 4424-4432. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4424-4432 Mots-clés : Mountain  Depressurization  Gas  hydrates  Natural  gas  Production  Numerical  simulation Résumé : In November 2008, gas hydrate samples were recovered during the scientific expedition conducted in the Qilian Mountain Permafrost It is expected that this area will become a strategic area of gas hydrate production in China. However, the evaluation of the hydrate deposits in the area as a potential energy resource has not been completed. Using numerical simulation and currently available data from site measurements, we preliminarily estimate the gas production potential of these hydrate reservoirs. The cumulative volume of the produced CH4 at the well in the early production period (0―10 years) is more than 50% of the total gas production from the well. The gas hydrate dissociation mainly occurs in the vicinity of the horizontal well and along a cylindrical interface. There is a ringlike structure of ice around the horizontal well during the gas production process. With the decrease of the gas production rate, the ice starts to melt from the bottom to the top under the influence of the geothermal gradient The sensitivity analysis demonstrates the dependence of production on the intrinsic permeability and the initial deposit temperature. Economic assessment based on the cumulative volumetric gas production and the gas-to-water ratio indicates that it is not economically viable to produce gas from this hydrate deposit using single horizontal well by depressurization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655650