Hydrogen production by ammonia decomposition over ruthenium supported on SiC catalyst
A series of ruthenium catalysts using β-SiC as a support was synthesized with different metal loading (1−5 wt.% of Ru). Catalysts were characterized and tested with hydrogen production by catalytic ammonia decomposition. Additionally, the influence of calcination conditions as well as reduction temp...
| Autores: | , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2021 |
| País: | España |
| Recursos: | Universidad de Castilla-La Mancha |
| Repositório: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/31188 |
| Acesso em linha: | https://hdl.handle.net/10578/31188 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Ammonia decomposition Hydrogen production Ruthenium catalyst SiC support Descomposición de amoníaco Producción de hidrógenocatalizador de rutenio Soporte SiC |
| Resumo: | A series of ruthenium catalysts using β-SiC as a support was synthesized with different metal loading (1−5 wt.% of Ru). Catalysts were characterized and tested with hydrogen production by catalytic ammonia decomposition. Additionally, the influence of calcination conditions as well as reduction temperatures (673 K and 873 K) was studied. Ru dispersion and metallic particle size were found to greatly influence catalytic activity. Moreover, calcination in a nitrogen atmosphere could remove a higher proportion of chlorine species derived from the precursor, thereby enhancing catalytic activity. Furthermore, a lower reduction temperature resulted in smaller particle sizes of ruthenium, which were more active in ammonia decomposition. Maximum intrinsic activity was obtained for a Ru size of around 5 nm. The catalyst containing 2.5 wt.% Ru, calcined in a N2 atmosphere and reduced at 673 K resulted in excellent H2 production from ammonia decomposition, with ammonia conversion close to 100% at 623 K was obtained. Porous SiC proved to be a suitable support for the nanosized Ru catalyst and was highly active in hydrogen production from ammonia decomposition. Moreover, this support provided good performance stability after one day of reaction. |
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