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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Autores principales:	Ayude, María Alejandra, Cassanello Fernández, Miryam Celeste
Publicado:	2008
Materias:	Alcohol oxidation Catalyst activation Catalyst deactivation Liquid flow modulation Multiphase reactors Stability Chemical reactors Ethanol Palladium Solutions Aqueous solutions Catalytic activities Trickle-bed reactors Modulation
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092509_v63_n20_p4969_Ayude http://hdl.handle.net/20.500.12110/paper_00092509_v63_n20_p4969_Ayude
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00092509_v63_n20_p4969_Ayude
record_format	dspace
spelling	paper:paper_00092509_v63_n20_p4969_Ayude2023-06-08T14:33:37Z Trickle bed reactors: Effect of liquid flow modulation on catalytic activity Ayude, María Alejandra Cassanello Fernández, Miryam Celeste 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092509_v63_n20_p4969_Ayude 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, María Alejandra Cassanello Fernández, Miryam Celeste 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.
author	Ayude, María Alejandra Cassanello Fernández, Miryam Celeste
author_facet	Ayude, María Alejandra Cassanello Fernández, Miryam Celeste
author_sort	Ayude, María Alejandra
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
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092509_v63_n20_p4969_Ayude http://hdl.handle.net/20.500.12110/paper_00092509_v63_n20_p4969_Ayude
work_keys_str_mv	AT ayudemariaalejandra tricklebedreactorseffectofliquidflowmodulationoncatalyticactivity AT cassanellofernandezmiryamceleste tricklebedreactorseffectofliquidflowmodulationoncatalyticactivity
_version_	1768543161850789888

Trickle bed reactors: Effect of liquid flow modulation on catalytic activity

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