Metal oxide-promoted mesoporous silica as support for Ru-based CO2 methanation catalysts

Hongmanorom, Plaifa;Neraud, Aurélien;Styskalik, Ales;Limphirat, Wanwisa;Debecker, Damien;et.al.
(2026) Applied Catalysis B: Environmental — Vol. 384, p. 126142 (2026)

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Abstract
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 °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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Hongmanorom, P., Neraud, A., Styskalik, A., Limphirat, W., Praserthdam, P., & Debecker, D. (2026). Metal oxide-promoted mesoporous silica as support for Ru-based CO2 methanation catalysts. Applied Catalysis B: Environmental, 384, 126142. https://doi.org/10.1016/j.apcatb.2025.126142 (Original work published 2026)