Exploring the preparation of Ni/TiCSiC catalysts for hydrogen production from ammonia
This work explores an innovative and effective approach to address the climatic challenges by designing efficient, novel, and stable nickel catalysts based on a commercial TiCSiC composite as a support material. Through a simple wet impregnation synthesis, these catalysts were successfully synthetiz...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Recursos: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/39740 |
| Acesso em linha: | https://doi.org/10.1016/j.cej.2024.158042 https://hdl.handle.net/10578/39740 |
| Access Level: | acceso abierto |
| Palavra-chave: | Ammonia Decomposition Catalyst Green Hydrogen Nickel TiCSiC support |
| Resumo: | This work explores an innovative and effective approach to address the climatic challenges by designing efficient, novel, and stable nickel catalysts based on a commercial TiCSiC composite as a support material. Through a simple wet impregnation synthesis, these catalysts were successfully synthetized, enabling completely COx-free hydrogen production from ammonia decomposition. To comprehensively understand the nature of the prepared catalyst, a complete characterization was performed. Results revealed that a pretreatment in air at 700 °C optimized catalyst performance, attributed to the TiO2 species emerged in the crystalline structure of the composite and its optimal crystallite size. Moreover, the nickel content affected the metal crystallite size and reducibility and, consequently, the ammonia conversion at moderate temperatures. Thus, the selected catalyst required only 5 wt% of Ni after a calcination in air at 700 °C, converting a notable 91.5 % of ammonia at 500 °C with a hydrogen production rate of 61.3 mmol H2·gNi-1·min-1. The optimized catalyst also demonstrated a long-term thermal stability after more than 45 h in ammonia reactions. These promising findings not only improve catalytic efficiency in current green hydrogen technology, but also contribute significantly to transition towards a sustainable future by using hydrogen vectors and non-critical metals as active phase of catalysts. |
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