Efficacy of fresh and used supported copper-based catalysts for ferulic acid degradation by wet air oxidation process / Bholu R. Yadav in Industrial & engineering chemistry research, Vol. 51 N° 48 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 48 (Décembre 2012) . - pp. 15778-15785 Titre : Efficacy of fresh and used supported copper-based catalysts for ferulic acid degradation by wet air oxidation process Type de document : texte imprimé Auteurs : Bholu R. Yadav, Auteur ; Anurag Garg, Auteur Année de publication : 2013 Article en page(s) : pp. 15778-15785 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidation Wet air Catalyst Résumé : Pulp mill effluents are not suitable for conventional biological treatment processes due to the presence of lignin which is found in cellulosic raw materials. The present study was undertaken to remove ferulic acid (a lignin model compound) from synthetic wastewater using a catalytic wet air oxidation (CWAO) process. The hydrothermal process was performed in the presence of three heterogeneous catalysts, namely, 60% CuO/40% CeO2, 60% CuO/40% Al2O3, and 60% CuO/40% 13X, in a temperature range of 90―160 °C, while the total pressure was maintained in the range of 0.55-0.8 MPa. CuO and CeO2 mixture (prepared by the sol gel peroxo method) exhibited the best performance and removed ca. 70% chemical oxygen demand (COD) from the wastewater at 120 °C temperature. The spent catalyst showed appreciable decline in the COD removal during reuse. The detailed results obtained from the catalyst characterization (fresh and used) and WAO studies are presented in the paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26710614 [article] Efficacy of fresh and used supported copper-based catalysts for ferulic acid degradation by wet air oxidation process [texte imprimé] / Bholu R. Yadav, Auteur ; Anurag Garg, Auteur . - 2013 . - pp. 15778-15785. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 48 (Décembre 2012) . - pp. 15778-15785 Mots-clés : Oxidation Wet air Catalyst Résumé : Pulp mill effluents are not suitable for conventional biological treatment processes due to the presence of lignin which is found in cellulosic raw materials. The present study was undertaken to remove ferulic acid (a lignin model compound) from synthetic wastewater using a catalytic wet air oxidation (CWAO) process. The hydrothermal process was performed in the presence of three heterogeneous catalysts, namely, 60% CuO/40% CeO2, 60% CuO/40% Al2O3, and 60% CuO/40% 13X, in a temperature range of 90―160 °C, while the total pressure was maintained in the range of 0.55-0.8 MPa. CuO and CeO2 mixture (prepared by the sol gel peroxo method) exhibited the best performance and removed ca. 70% chemical oxygen demand (COD) from the wastewater at 120 °C temperature. The spent catalyst showed appreciable decline in the COD removal during reuse. The detailed results obtained from the catalyst characterization (fresh and used) and WAO studies are presented in the paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26710614

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Wet oxidation / Anurag Garg in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5575–5582 Titre : Wet oxidation : an option for enhancing biodegradability of leachate derived from municipal solid waste (MSW) landfill Type de document : texte imprimé Auteurs : Anurag Garg, Auteur ; Alok Mishra, Auteur Année de publication : 2010 Article en page(s) : pp. 5575–5582 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Municipal solid waste Landfill leachateCatalytic wet oxidation (WO) process Résumé : The present study reports the treatment of municipal solid waste (MSW) derived landfill leachate (initial pH = 7.82 and chemical oxygen demand (COD) = 6400 mg L−1) using catalytic wet oxidation (WO) process. The reaction was performed under moderate conditions (110−150 °C temperature and 0.7 MPa total pressures) in the presence of a CuSO4 catalyst. The effect of the promoter (Na2SO3) was also seen on the COD removal. The results were compared with that obtained for Fe2+ and H2O2 combination. Among all tested combinations, (CuSO4 + Na2SO3 + air) exhibited the best performance with ∼90% COD reduction at 150 °C temperature and 0.7 MPa pressures. Under these conditions, the biodegradability of the treated effluent was improved to 0.66 (from an initial value of 0.38). The average oxidation state of carbon (AOSC) value and Fourier transform infrared (FTIR) spectroscopy confirmed the presence of carboxylic acids in the treated effluent. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100003q [article] Wet oxidation : an option for enhancing biodegradability of leachate derived from municipal solid waste (MSW) landfill [texte imprimé] / Anurag Garg, Auteur ; Alok Mishra, Auteur . - 2010 . - pp. 5575–5582. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5575–5582 Mots-clés : Municipal solid waste Landfill leachateCatalytic wet oxidation (WO) process Résumé : The present study reports the treatment of municipal solid waste (MSW) derived landfill leachate (initial pH = 7.82 and chemical oxygen demand (COD) = 6400 mg L−1) using catalytic wet oxidation (WO) process. The reaction was performed under moderate conditions (110−150 °C temperature and 0.7 MPa total pressures) in the presence of a CuSO4 catalyst. The effect of the promoter (Na2SO3) was also seen on the COD removal. The results were compared with that obtained for Fe2+ and H2O2 combination. Among all tested combinations, (CuSO4 + Na2SO3 + air) exhibited the best performance with ∼90% COD reduction at 150 °C temperature and 0.7 MPa pressures. Under these conditions, the biodegradability of the treated effluent was improved to 0.66 (from an initial value of 0.38). The average oxidation state of carbon (AOSC) value and Fourier transform infrared (FTIR) spectroscopy confirmed the presence of carboxylic acids in the treated effluent. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100003q

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