Effect of Ba and Mg as promoter on Ru/g-C3N4 catalyst for CO2 methanation
Catalytic hydrogenation of CO2 to produce value-added hydrocarbons is a promising strategy for reducing greenhouse gas emissions and producing renewable fuels and chemicals. In this study, Ru- g-C3 N₄4 catalysts were modified with barium (Ba) and magnesium (Mg) promoters to improve the conversion ef...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/425687 |
| Acceso en línea: | http://hdl.handle.net/10261/425687 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105010823043&doi=10.1016%2Fj.jcou.2025.103158&partnerID=40&md5=a6f1095dd65f26e00c6f1bb25bd332ce |
| Access Level: | acceso abierto |
| Palabra clave: | Ba CO<sub>2</sub> conversion Graphitic carbon nitride Methanation Mg Ru |
| Sumario: | Catalytic hydrogenation of CO2 to produce value-added hydrocarbons is a promising strategy for reducing greenhouse gas emissions and producing renewable fuels and chemicals. In this study, Ru- g-C3 N₄4 catalysts were modified with barium (Ba) and magnesium (Mg) promoters to improve the conversion efficiency of CO2 and tune the products selectivity of the Ru/g-C3 N4 catalysts. Two different synthetic approaches were used; namely, co-impregnation with Ru and pre-incorporation of Ba or Mg into the g-C3N4 lattice prior to Ru loading. The study revealed that Ba modification significantly improved the catalyst's performance, resulting in higher CO2 conversion rates and the selective formation of CH4. This enhancement is attributed to the electronic and structural modifications induced by doping Ba into the g-C3N4 lattice that facilitate CO2 activation and hydrogenation. In contrast, adding Ba via co-impregnation partially covered Ru sites, promoting CO formation by stabilizing isolated Ru sites and small clusters, as confirmed by in-situ CO adsorption studies. Conversely, Mg had a negative effect, likely due to more pronounced coverage of Ru active sites, which suppressed catalytic performance. These findings emphasise the importance of selecting suitable promoters to optimise CO2 hydrogenation catalysts, with Ba-doped Ru/g-C3 N4 emerging as an effective system for methane synthesis. © 2025 The Authors. |
|---|