Trickle bed reactors: Effect of liquid flow modulation on catalytic activity
The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd / Al2 O3 commercial egg-shell catalyst was investigated in a laboratory trickle bed reactor (TBR). In this mode of operation, the catalyst was cyclically exposed to oxidative and reducti...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00092509_v63_n20_p4969_Ayude |
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todo:paper_00092509_v63_n20_p4969_Ayude2023-10-03T14:08:09Z Trickle bed reactors: Effect of liquid flow modulation on catalytic activity Ayude, A. Cechini, J. Cassanello, M. Martínez, O. Haure, P. Alcohol oxidation Catalyst activation Catalyst deactivation Liquid flow modulation Multiphase reactors Stability Chemical reactors Ethanol Palladium Solutions Alcohol oxidation Aqueous solutions Catalyst activation Catalyst deactivation Catalytic activities Liquid flow modulation Multiphase reactors Stability Trickle-bed reactors Modulation The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd / Al2 O3 commercial egg-shell catalyst was investigated in a laboratory trickle bed reactor (TBR). In this mode of operation, the catalyst was cyclically exposed to oxidative and reductive environments. The study was carried out under different gas and liquid flow rates, cycle periods and splits. Cycling results have been compared with the steady-state experiments performed at the corresponding average liquid flow rate. Significant improvements over the continuous operation were obtained when the catalyst was exposed to a short surplus of oxygen (to minimize deactivation by overoxidation in the kinetic regime) after a longer time of working in the mass transfer limited regime. According to the results presented here, it is recommended to work with high liquid flow rates and moderate gas flow rates to ensure complete wetting of the catalyst during the ON cycle and to minimize the overoxidation process during the OFF cycle. © 2008 Elsevier Ltd. All rights reserved. Fil:Ayude, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cassanello, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00092509_v63_n20_p4969_Ayude |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Alcohol oxidation Catalyst activation Catalyst deactivation Liquid flow modulation Multiphase reactors Stability Chemical reactors Ethanol Palladium Solutions Alcohol oxidation Aqueous solutions Catalyst activation Catalyst deactivation Catalytic activities Liquid flow modulation Multiphase reactors Stability Trickle-bed reactors Modulation |
| spellingShingle |
Alcohol oxidation Catalyst activation Catalyst deactivation Liquid flow modulation Multiphase reactors Stability Chemical reactors Ethanol Palladium Solutions Alcohol oxidation Aqueous solutions Catalyst activation Catalyst deactivation Catalytic activities Liquid flow modulation Multiphase reactors Stability Trickle-bed reactors Modulation Ayude, A. Cechini, J. Cassanello, M. Martínez, O. Haure, P. Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| topic_facet |
Alcohol oxidation Catalyst activation Catalyst deactivation Liquid flow modulation Multiphase reactors Stability Chemical reactors Ethanol Palladium Solutions Alcohol oxidation Aqueous solutions Catalyst activation Catalyst deactivation Catalytic activities Liquid flow modulation Multiphase reactors Stability Trickle-bed reactors Modulation |
| description |
The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd / Al2 O3 commercial egg-shell catalyst was investigated in a laboratory trickle bed reactor (TBR). In this mode of operation, the catalyst was cyclically exposed to oxidative and reductive environments. The study was carried out under different gas and liquid flow rates, cycle periods and splits. Cycling results have been compared with the steady-state experiments performed at the corresponding average liquid flow rate. Significant improvements over the continuous operation were obtained when the catalyst was exposed to a short surplus of oxygen (to minimize deactivation by overoxidation in the kinetic regime) after a longer time of working in the mass transfer limited regime. According to the results presented here, it is recommended to work with high liquid flow rates and moderate gas flow rates to ensure complete wetting of the catalyst during the ON cycle and to minimize the overoxidation process during the OFF cycle. © 2008 Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Ayude, A. Cechini, J. Cassanello, M. Martínez, O. Haure, P. |
| author_facet |
Ayude, A. Cechini, J. Cassanello, M. Martínez, O. Haure, P. |
| author_sort |
Ayude, A. |
| title |
Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| title_short |
Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| title_full |
Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| title_fullStr |
Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| title_full_unstemmed |
Trickle bed reactors: Effect of liquid flow modulation on catalytic activity |
| title_sort |
trickle bed reactors: effect of liquid flow modulation on catalytic activity |
| url |
http://hdl.handle.net/20.500.12110/paper_00092509_v63_n20_p4969_Ayude |
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1782030646355427328 |