||Recently, liquid organic hydrogen carrier (LOHC) system has been attracting attention as a technique that can very effectively (dis)charge and transport hydrogen. In the hydrogenation for charging hydrogen, Ru catalysts were the most efficient than Pt, Pd, and Rh. Ru3(CO)12 is known to be the most active Ru precursor for the synthesis of supported Ru catalysts. Therefore, understanding the activation of Ru3(CO)12 on different support materials is of great importance to tune the properties and activities of Ru nanoparticles. Supported Ru catalysts on Al2O3, ZrO2, and MgO were investigated in the hydrogenation of LOHC compounds. Consequently, the surface area and OH group of support materials strongly affected the hydrogenation activity of supported Ru catalysts.