Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation
The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd/Al2O3 commercial egg-shell catalyst was investigated in a laboratory scale Trickle Bed Reactor (TBR). The behavior of noble metal catalysts used in alcohol oxidation strongly depends on...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_NIS12854_v_n_p_Ayude |
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todo:paper_NIS12854_v_n_p_Ayude2023-10-03T16:45:53Z Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation Ayude, M.A. Cassanello, M.C. Martínez, O.M. Haure, P.M. Atanor; Compania Mega S.A.; Consejo Federal de Inversiones (CFI); Dow; et al.; Petroquimica Rio Tercero SA (PRIII) Over-oxidation Periodic operation Trickle bed reactors Catalyst activity Chemical reactors Liquids Mass transfer Modulation Oxidation Oxygen Palladium Precious metals Reaction rates Redox reactions Solutions Carbonaceous deposits Liquid flow modulation Noble metal catalysts Overoxidations Oxygen concentrations Periodic operation Steady-state operation Trickle bed reactor Catalysts The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd/Al2O3 commercial egg-shell catalyst was investigated in a laboratory scale Trickle Bed Reactor (TBR). The behavior of noble metal catalysts used in alcohol oxidation strongly depends on the degree of exposure to oxygen. At low oxygen concentration, the reaction rate is low and the catalyst may deactivate by adsorption of carbonaceous deposits, while under rich oxygen concentration, the catalyst deactivates due to over-oxidation. So, ON-OFF modulation of the liquid flow was implemented with the aim of increasing the conversion and/or reaction rate. In this mode of operation, the catalyst was cyclically exposed to oxidative and reductive environments, therefore the TBR behaved as a redox cycle reactor. Experiments were conducted at different liquid flow rates, cycle periods and splits. Significant improvements over the steady state operation were obtained when the catalyst was exposed to a short surplus of oxygen after a longer time of working in the mass transfer limited regime. Proper selection of cycle duration and an adequate start-up protocol are crucial to maintain long term catalytic activity. Fil:Ayude, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cassanello, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_NIS12854_v_n_p_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 |
Over-oxidation Periodic operation Trickle bed reactors Catalyst activity Chemical reactors Liquids Mass transfer Modulation Oxidation Oxygen Palladium Precious metals Reaction rates Redox reactions Solutions Carbonaceous deposits Liquid flow modulation Noble metal catalysts Overoxidations Oxygen concentrations Periodic operation Steady-state operation Trickle bed reactor Catalysts |
| spellingShingle |
Over-oxidation Periodic operation Trickle bed reactors Catalyst activity Chemical reactors Liquids Mass transfer Modulation Oxidation Oxygen Palladium Precious metals Reaction rates Redox reactions Solutions Carbonaceous deposits Liquid flow modulation Noble metal catalysts Overoxidations Oxygen concentrations Periodic operation Steady-state operation Trickle bed reactor Catalysts Ayude, M.A. Cassanello, M.C. Martínez, O.M. Haure, P.M. Atanor; Compania Mega S.A.; Consejo Federal de Inversiones (CFI); Dow; et al.; Petroquimica Rio Tercero SA (PRIII) Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| topic_facet |
Over-oxidation Periodic operation Trickle bed reactors Catalyst activity Chemical reactors Liquids Mass transfer Modulation Oxidation Oxygen Palladium Precious metals Reaction rates Redox reactions Solutions Carbonaceous deposits Liquid flow modulation Noble metal catalysts Overoxidations Oxygen concentrations Periodic operation Steady-state operation Trickle bed reactor Catalysts |
| description |
The effect of slow ON-OFF liquid flow modulation on the oxidation of aqueous solutions of ethanol using a 0.5% Pd/Al2O3 commercial egg-shell catalyst was investigated in a laboratory scale Trickle Bed Reactor (TBR). The behavior of noble metal catalysts used in alcohol oxidation strongly depends on the degree of exposure to oxygen. At low oxygen concentration, the reaction rate is low and the catalyst may deactivate by adsorption of carbonaceous deposits, while under rich oxygen concentration, the catalyst deactivates due to over-oxidation. So, ON-OFF modulation of the liquid flow was implemented with the aim of increasing the conversion and/or reaction rate. In this mode of operation, the catalyst was cyclically exposed to oxidative and reductive environments, therefore the TBR behaved as a redox cycle reactor. Experiments were conducted at different liquid flow rates, cycle periods and splits. Significant improvements over the steady state operation were obtained when the catalyst was exposed to a short surplus of oxygen after a longer time of working in the mass transfer limited regime. Proper selection of cycle duration and an adequate start-up protocol are crucial to maintain long term catalytic activity. |
| format |
CONF |
| author |
Ayude, M.A. Cassanello, M.C. Martínez, O.M. Haure, P.M. Atanor; Compania Mega S.A.; Consejo Federal de Inversiones (CFI); Dow; et al.; Petroquimica Rio Tercero SA (PRIII) |
| author_facet |
Ayude, M.A. Cassanello, M.C. Martínez, O.M. Haure, P.M. Atanor; Compania Mega S.A.; Consejo Federal de Inversiones (CFI); Dow; et al.; Petroquimica Rio Tercero SA (PRIII) |
| author_sort |
Ayude, M.A. |
| title |
Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| title_short |
Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| title_full |
Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| title_fullStr |
Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| title_full_unstemmed |
Effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| title_sort |
effect of liquid flow modulation on the stability of noble metal catalysts for alcohol oxidation |
| url |
http://hdl.handle.net/20.500.12110/paper_NIS12854_v_n_p_Ayude |
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1807321312158285824 |