Metal oxide-promoted mesoporous silica as support for Ru-based CO2 methanation catalysts
| Autoři | |
|---|---|
| Rok publikování | 2026 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://www.sciencedirect.com/science/article/pii/S0926337325011257 |
| Doi | https://doi.org/10.1016/j.apcatb.2025.126142 |
| Klíčová slova | Mesoporous silica; Vanadium; Ruthenium; CO 2 methanation; Metal oxide promoter |
| Popis | Transition metals are widely employed to promote heterogeneous catalysts, yet their effects on Ru-based CO2 methanation remain unclear. Herein, mesoporous silica supports promoted with Ti, Zr, Nb, or V were synthesized via an aerosol-assisted sol-gel process to systematically compare their effects. With fixed promoter (4 mol%) and Ru (2 wt%) loadings, vanadia exhibits a unique promoting effect, attributed to Ru-V synergy that facilitates hydrogen spillover and generates oxygen vacancies. Increasing V loading to 16 mol% markedly reduces specific surface area and induces macropore formation due to V2O5 crystallization, yet significantly enhances activity, with CH4 formation at 250 degrees C 8 times higher than unpromoted Ru/SiO2. This improvement is rationalized by improved Ru dispersion and hydrogen spillover from Ru to adjacent V species. In-situ DRUV-Vis and XANES analyses reveal V5 + reduction to lower oxidation states and oxygen-vacancy generation, while in-situ DRIFTS shows modified CO adsorption, thereby promoting methanation via the CO pathway. |
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