Continuous hydrogen production from liquid-phase formic acid dehydrogenation over Pd/AC catalysts: a kinetic study
Hydrogen production using formic acid (FA) as renewable carrier has been investigated in a fixed bed reactor packed with a commercial Pd/AC catalyst. For the first time, both FA disappearance and evolved gas flow rate have been monitored upon space-time, enabling the elucidation of the FA reaction p...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/712933 |
| Acceso en línea: | http://hdl.handle.net/10486/712933 https://dx.doi.org/10.1016/j.cattod.2024.114828 |
| Access Level: | acceso abierto |
| Palabra clave: | Hydrogen Storage Liquid Organic Hydrogen Carriers Formic Acid Catalyst Deactivation Kinetic Model Química |
| Sumario: | Hydrogen production using formic acid (FA) as renewable carrier has been investigated in a fixed bed reactor packed with a commercial Pd/AC catalyst. For the first time, both FA disappearance and evolved gas flow rate have been monitored upon space-time, enabling the elucidation of the FA reaction pathway and the development of a kinetic model that accounts for catalyst deactivation. Nearly complete FA conversion and a production of 10 mL min of hydrogen gas were achieved under the following operating conditions: C and τ = 66.7 g CAT 1 h L FA,0 = 1 M, T = 45 ºC . The reaction was found not to be controlled the mass transfer limitations. The kinetic model reveals a first order with respect to FA concentration, with FA disappearing through dehydrogenation into hydrogen and CO 1 2 36.7 kJ mol 1 (E a = 53.6 kJ mol ) as well as sorption onto the catalyst surface without reaction (E a = ). The catalyst deactivation is attributed to the accumulation of reaction species, including FA/ HCOO- (reversibly sorbed) and CO (irreversibly chemisorbed), on the Pd active sites and the progressive decrease in the Pd 2+ /Pd 0 ratio |
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