Pascual, S. Barón, C. Katla, D. Skorek-Osikowska, A. Wecel, D. Bailera, M. Legaz, J. Peña, B. Lisbona, P. Pilot-plant experimental tests and kinetic model validation of Ru-based catalytic methanation: assessment of operating pressure and filler material on carbon conversion Energy 10.1016/j.energy.2025.138183 2025 2025