“…Similarly, 1 H-NMR spectra of diphenylmethane, 2-phenyltoluene, 3-phenyltoluene, and toluene ( Figure S3- Figure S10, Supporting Information) confirmed that the hydrogenation reactions of these materials were readily proceeded. [23,24] In agreement with our results, few previous literatures have reported that hydrogenation of naphthalene was achieved with different catalyst materials, such as Ni-W sulfide; [25] however, much higher reaction temperature ( � 380°C) was required to achieve a conversion rate of over 80 %. In Figure S12, Supporting Information, 1 H-NMR spectrum obtained for the reaction products of 1methylnaphthalene still exhibited the peaks located between 7 and 8 ppm corresponding to the aromatic protons, indicating that the hydrogenation reaction rate of 1-methylnaphthalene was significantly slower than those of other aromatic compounds, or that the reaction did not occur under the tested reaction conditions.…”