Simulations of a fixed bed catalytic reactor for the production of methane from syngas - Koytsoumpa, Efthymia Ioanna; Griendl, Lorenz; Karellas, Sotirios; Panopoulos, Kyriakos D.; Nikolopoulos, Aristeidis; Karl, Jürgen; Kakaras, Emmanuel C. (Proceedings of the 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2011, 2011)