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Direct synthesis of hydrogen peroxide in a trickle bed reactor / Pierdomenico Biasi in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8883-8890 Titre : Direct synthesis of hydrogen peroxide in a trickle bed reactor : Comparison of Pd - based catalysts Type de document : texte imprimé Auteurs : Pierdomenico Biasi, Auteur ; Paolo Canu, Auteur ; Federica Menegazzo, Auteur Année de publication : 2012 Article en page(s) : pp. 8883-8890 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Trickle  bed  reactor  Hydrogen  peroxide Résumé : Palladium catalysts based on different supports, silica (SiO2), zirconia (Z), sulfated ceria (CeS), and sulfated zirconia (ZS), previously tested in a semibatch reactor, were chosen to demonstrate how the direct synthesis process can be improved by continuous operation in a three-phase fixed bed. The gas and liquid flow rates were systematically varied to find suitable combinations for a maximum hydrogen peroxide production rate and selectivity. Different catalysts gave the same results in terms of selectivity and production rate with different operating conditions. A selectivity of 60% and 70% was found with two different catalysts (namely, Pd-ZS and Pd-CeS). Very interestingly those selectivities were found with different gas and liquid flow rates (i.e., 70% of selectivity for Pd-ZS with liquid 1 mL/min and gas 2.7 mL/min, liquid 0.5 mL/min MeOH and gas 4 mL/ min, and finally liquid 2 mL/min MeOH and gas 1 mL/min 65% of selectivity for Pd-CeS with liquid 1 mL/min and gas 4 mL/ min). Moreover, the same maximum production rate of H2O2 around 3 μmol/min for Pd-CeS, Pd-ZS, and Pd-Z was achieved with different liquid and gas flow rates. Continuous operation and reactor technology play important roles in this green synthesis: optimization of gas and liquid flow rates and contact time between the liquid and the solid (catalysts) phase lead to a dramatic selectivity improvement in a continuous reactor, raising the value obtained in the semibatch reactor from 30% to 70%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107443 [article] Direct synthesis of hydrogen peroxide in a trickle bed reactor : Comparison of Pd - based catalysts [texte imprimé] / Pierdomenico Biasi, Auteur ; Paolo Canu, Auteur ; Federica Menegazzo, Auteur . - 2012 . - pp. 8883-8890. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8883-8890 Mots-clés : Catalyst  Trickle  bed  reactor  Hydrogen  peroxide Résumé : Palladium catalysts based on different supports, silica (SiO2), zirconia (Z), sulfated ceria (CeS), and sulfated zirconia (ZS), previously tested in a semibatch reactor, were chosen to demonstrate how the direct synthesis process can be improved by continuous operation in a three-phase fixed bed. The gas and liquid flow rates were systematically varied to find suitable combinations for a maximum hydrogen peroxide production rate and selectivity. Different catalysts gave the same results in terms of selectivity and production rate with different operating conditions. A selectivity of 60% and 70% was found with two different catalysts (namely, Pd-ZS and Pd-CeS). Very interestingly those selectivities were found with different gas and liquid flow rates (i.e., 70% of selectivity for Pd-ZS with liquid 1 mL/min and gas 2.7 mL/min, liquid 0.5 mL/min MeOH and gas 4 mL/ min, and finally liquid 2 mL/min MeOH and gas 1 mL/min 65% of selectivity for Pd-CeS with liquid 1 mL/min and gas 4 mL/ min). Moreover, the same maximum production rate of H2O2 around 3 μmol/min for Pd-CeS, Pd-ZS, and Pd-Z was achieved with different liquid and gas flow rates. Continuous operation and reactor technology play important roles in this green synthesis: optimization of gas and liquid flow rates and contact time between the liquid and the solid (catalysts) phase lead to a dramatic selectivity improvement in a continuous reactor, raising the value obtained in the semibatch reactor from 30% to 70%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107443

Hydrogen peroxide direct synthesis / Pierdomenico Biasi in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10627-10632 Titre : Hydrogen peroxide direct synthesis : Selectivity enhancement in a trickle bed reactor Type de document : texte imprimé Auteurs : Pierdomenico Biasi, Auteur ; Federica Menegazzo, Auteur ; Francesco Pinna, Auteur Année de publication : 2011 Article en page(s) : pp. 10627-10632 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Trickle  bed  reactor  Hydrogen  peroxide Résumé : H2O2 direct synthesis over a palladium catalyst based on sulfated ceria (Pd-CeS) has been studied in a trickle-bed reactor at ― 10 °C. The combined effect of liquid and gas flow rates was studied by independent variations. The maximum productivity and selectivity was always found at flow rate combinations intermediate within the investigated range. The reactor operated under pressure and its effect was investigated (10 and 20 bar), resulting in a significant gain in selectivity. Selectivity up to 80% has been measured at the highest pressure tested (20 bars), liquid flow rate of 2 mL/min, and 6 mL/min gas flow rate. The maximum production rate measured was 0.0035 mmol/min with 0.5 mL/min liquid flow rate and 2.7 mL/min gas flow rate. Relevance of direct water formation has been isolated by independently investigating H2O2 decomposition and hydrogenation. Results indicate directions of further performance improvements and the importance of reactor type and operation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447955 [article] Hydrogen peroxide direct synthesis : Selectivity enhancement in a trickle bed reactor [texte imprimé] / Pierdomenico Biasi, Auteur ; Federica Menegazzo, Auteur ; Francesco Pinna, Auteur . - 2011 . - pp. 10627-10632. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10627-10632 Mots-clés : Trickle  bed  reactor  Hydrogen  peroxide Résumé : H2O2 direct synthesis over a palladium catalyst based on sulfated ceria (Pd-CeS) has been studied in a trickle-bed reactor at ― 10 °C. The combined effect of liquid and gas flow rates was studied by independent variations. The maximum productivity and selectivity was always found at flow rate combinations intermediate within the investigated range. The reactor operated under pressure and its effect was investigated (10 and 20 bar), resulting in a significant gain in selectivity. Selectivity up to 80% has been measured at the highest pressure tested (20 bars), liquid flow rate of 2 mL/min, and 6 mL/min gas flow rate. The maximum production rate measured was 0.0035 mmol/min with 0.5 mL/min liquid flow rate and 2.7 mL/min gas flow rate. Relevance of direct water formation has been isolated by independently investigating H2O2 decomposition and hydrogenation. Results indicate directions of further performance improvements and the importance of reactor type and operation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447955