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Abatement of Aniline in Supercritical Water Using Oxygen as the Oxidant / Honghe Ma in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9475-9482 Titre : Abatement of Aniline in Supercritical Water Using Oxygen as the Oxidant Type de document : texte imprimé Auteurs : Honghe Ma, Auteur ; ShuZhong Wang, Auteur ; Lu Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 9475-9482 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidant  Supercritical  state  Pollution  abatement Résumé : Abatement of aniline in supercritical water was explored in a tubular-flow reactor using oxygen as the oxidant. The effects of the reaction temperature, oxidant stoichiometric ratio, residence time, and initial aniline concentration on the product distribution were investigated. Aniline was primarily hydrolyzed to phenol and ammonia, and thereby, abatement of aniline was converted into the co-oxidation of phenol and ammonia in supercritical water. Phenol was the main carbon-containing intermediate, and ammonia was the exclusive nitrogen-containing intermediate on the pathway to the end products N2, N2O, and NO3-. Owing to the adsorption of aniline and catalysis on the reactor wall (made of Hastelloy C-276), the disappearance of ammonia during aniline supercritical water oxidation (SCWO) was markedly faster than that during SCWO of ammonia alone. Ammonia was mainly converted to N2 (heterogeneous mechanism), and low levels of N2O and NO3― were also produced (homogeneous mechanism). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163283 [article] Abatement of Aniline in Supercritical Water Using Oxygen as the Oxidant [texte imprimé] / Honghe Ma, Auteur ; ShuZhong Wang, Auteur ; Lu Zhou, Auteur . - 2012 . - pp. 9475-9482. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9475-9482 Mots-clés : Oxidant  Supercritical  state  Pollution  abatement Résumé : Abatement of aniline in supercritical water was explored in a tubular-flow reactor using oxygen as the oxidant. The effects of the reaction temperature, oxidant stoichiometric ratio, residence time, and initial aniline concentration on the product distribution were investigated. Aniline was primarily hydrolyzed to phenol and ammonia, and thereby, abatement of aniline was converted into the co-oxidation of phenol and ammonia in supercritical water. Phenol was the main carbon-containing intermediate, and ammonia was the exclusive nitrogen-containing intermediate on the pathway to the end products N2, N2O, and NO3-. Owing to the adsorption of aniline and catalysis on the reactor wall (made of Hastelloy C-276), the disappearance of ammonia during aniline supercritical water oxidation (SCWO) was markedly faster than that during SCWO of ammonia alone. Ammonia was mainly converted to N2 (heterogeneous mechanism), and low levels of N2O and NO3― were also produced (homogeneous mechanism). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163283

Catalyzed partial oxidative gasification of phenol in supercritical water / DongHai Xu in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4301–4307 Titre : Catalyzed partial oxidative gasification of phenol in supercritical water Type de document : texte imprimé Auteurs : DongHai Xu, Auteur ; ShuZhong Wang, Auteur ; Yang Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 4301–4307 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gasification Résumé : Phenol, a substance difficult to be gasified, is often an intermediate product from biomass gasification in supercritical water. In this study, 1 wt % phenol is gasified in supercritical water with different oxidation coefficients (0 ≤ n ≤ 0.8) at 430−550 °C, 25 MPa in a continuous tubular-flow reaction plant with or without 0.1 wt % Na2CO3. The results show that TOC (total organic carbon) removal rate and COD (chemical oxygen demand) removal rate of reactor effluent will rise with the increase of oxidation coefficient and reaction temperature. When n rises from 0.3 to 0.8 at 500 °C, hydrogen yield and hydrogen molar fraction will first increase and then decrease. They reach their respective maximum values of 0.245 mol/mol and 46.2% at n = 0.6 with the residence time of 2.96 min. There is an appropriate oxidation coefficient for obtaining the highest hydrogen yield for phenol supercritical water partial oxidative gasification (SWPO). Na2CO3 can serve as a catalyst or an additive for phenol SWPO. When 0.1 wt % Na2CO3 is added, hydrogen yield is near 0.477 mol/mol at n = 0.6, 500 °C with the residence time of 2.96 min. Furthermore, the potential conversion pathways for phenol SWPO with Na2CO3 catalyst are also proposed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1016255 [article] Catalyzed partial oxidative gasification of phenol in supercritical water [texte imprimé] / DongHai Xu, Auteur ; ShuZhong Wang, Auteur ; Yang Guo, Auteur . - 2011 . - pp. 4301–4307. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4301–4307 Mots-clés : Gasification Résumé : Phenol, a substance difficult to be gasified, is often an intermediate product from biomass gasification in supercritical water. In this study, 1 wt % phenol is gasified in supercritical water with different oxidation coefficients (0 ≤ n ≤ 0.8) at 430−550 °C, 25 MPa in a continuous tubular-flow reaction plant with or without 0.1 wt % Na2CO3. The results show that TOC (total organic carbon) removal rate and COD (chemical oxygen demand) removal rate of reactor effluent will rise with the increase of oxidation coefficient and reaction temperature. When n rises from 0.3 to 0.8 at 500 °C, hydrogen yield and hydrogen molar fraction will first increase and then decrease. They reach their respective maximum values of 0.245 mol/mol and 46.2% at n = 0.6 with the residence time of 2.96 min. There is an appropriate oxidation coefficient for obtaining the highest hydrogen yield for phenol supercritical water partial oxidative gasification (SWPO). Na2CO3 can serve as a catalyst or an additive for phenol SWPO. When 0.1 wt % Na2CO3 is added, hydrogen yield is near 0.477 mol/mol at n = 0.6, 500 °C with the residence time of 2.96 min. Furthermore, the potential conversion pathways for phenol SWPO with Na2CO3 catalyst are also proposed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1016255

Oxidative degradation of lurgi coal-gasification wastewater with Mn2O3, Co2O3, and CuO catalysts in supercritical water / Yuzhen Wang in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16573-16579 Titre : Oxidative degradation of lurgi coal-gasification wastewater with Mn2O3, Co2O3, and CuO catalysts in supercritical water Type de document : texte imprimé Auteurs : Yuzhen Wang, Auteur ; ShuZhong Wang, Auteur ; Yang Guo, Auteur Année de publication : 2012 Article en page(s) : pp. 16573-16579 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Supercritical  sta  Catalyst  Waste  water  Coal  gasification  Coal  gasification  Chemical  degradation  Oxidation  Oxidative  degradation Résumé : Lurgi coal-gasification wastewater was degraded in supercritical water using Mn2O3, Co2O3, and CuO as catalysts. The experiments were performed in a batch reactor at temperatures of 380-460 °C and oxygen ratios of 1.5―3.5. The results involved evaluation of TOC and NH3―N removal efficiencies; detection of the main products in the effluent; XRD, SEM, and BET analyses of the catalysts; and detection of metal ions leached from the catalysts. Maximum TOC and NH3―N removals were found with Co2O3 catalyst at 460 °C and OR = 3.5. The effluent quality could meet class-I criteria of the Integrated Wastewater Discharge Standard (GB 8978-1996). The catalytic effects on pollutant removal were in the order Co2O3 > Mn2O3 > CuO. The major phase of Mn2O3 transformed into MnO2 with a decreasing BET surface area at 460 °C and an oxygen ratio of 3.5. Serious Cu-ion leaching occurred during the process and intensified with increasing temperature. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26755620 [article] Oxidative degradation of lurgi coal-gasification wastewater with Mn2O3, Co2O3, and CuO catalysts in supercritical water [texte imprimé] / Yuzhen Wang, Auteur ; ShuZhong Wang, Auteur ; Yang Guo, Auteur . - 2012 . - pp. 16573-16579. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16573-16579 Mots-clés : Supercritical  sta  Catalyst  Waste  water  Coal  gasification  Coal  gasification  Chemical  degradation  Oxidation  Oxidative  degradation Résumé : Lurgi coal-gasification wastewater was degraded in supercritical water using Mn2O3, Co2O3, and CuO as catalysts. The experiments were performed in a batch reactor at temperatures of 380-460 °C and oxygen ratios of 1.5―3.5. The results involved evaluation of TOC and NH3―N removal efficiencies; detection of the main products in the effluent; XRD, SEM, and BET analyses of the catalysts; and detection of metal ions leached from the catalysts. Maximum TOC and NH3―N removals were found with Co2O3 catalyst at 460 °C and OR = 3.5. The effluent quality could meet class-I criteria of the Integrated Wastewater Discharge Standard (GB 8978-1996). The catalytic effects on pollutant removal were in the order Co2O3 > Mn2O3 > CuO. The major phase of Mn2O3 transformed into MnO2 with a decreasing BET surface area at 460 °C and an oxygen ratio of 3.5. Serious Cu-ion leaching occurred during the process and intensified with increasing temperature. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26755620