Influence of Pd/AC catalytic properties on the continuous production of hydrogen from formic acid
Formic acid (FA) is a promising liquid organic hydrogen carrier for safe and efficient hydrogen handling. FA dehydrogenation occurs under near-ambient conditions using palladium/activated carbon (Pd/AC) catalysts, but aspects like high Pd loading grand gradual catalyst deactivation remain key challe...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/719783 |
| Acceso en línea: | http://hdl.handle.net/10486/719783 https://dx.doi.org/10.1002/cctc.202500411 |
| Access Level: | acceso abierto |
| Palabra clave: | Catalyst preparation Dehydrogenation Formicacid LOHC Pd nanoparticles Química |
| Sumario: | Formic acid (FA) is a promising liquid organic hydrogen carrier for safe and efficient hydrogen handling. FA dehydrogenation occurs under near-ambient conditions using palladium/activated carbon (Pd/AC) catalysts, but aspects like high Pd loading grand gradual catalyst deactivation remain key challenges. This study investigates how the physicochemical properties of Nanoparticles and support characteristics influence the continuous process performance including FA conversion, evolved gas flow rate, total hydrogen production, and catalyst durability. Pd catalysts were prepared via wet impregnation using various pre-cursors, powdered supports, and Pd loadings and evaluated in a fixed-bed reactor. The findings reveal that Pd/AC catalysts prepared with PdCl2 precursor and nano powdered AC are the most efficient. Strong electrostatic interactions between negatively charged PdCl42− species and the positively charged AC surface during impregnation enhance nanoparticle support interactions, resulting in small (∼2 nm), highly dispersed Pd nanoparticles with a high Pd2+/Pd 0 atomic surface ratio. Metal dispersion is the dominant factor influencing hydrogen production, surpassing the effects of both particle size and electronic state. Higher Pd loadings also increased catalyst durability, reducing regeneration frequency. This study provides valuable insights into the rational design of Pd/AC catalysts, paving the way for efficient FA utilization as a hydrogen carrier |
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