Chem. Commun., 2026, Accepted Manuscript DOI: 10.1039/D6CC02276F, Communication Han Yajing, Huang Pengfei, Xinkang Cui, Quan Liu, Qinggan Zeng, Peixu Yang, Liqiang Wang Alkaline-earth metal carbonates (e.g., CaCO3) supported Ru have been demonstrated as effective catalysts for quinoline hydrogenation. The electronic metal–support interaction (EMSI) between CaCO3 and Ru enriches Ru electron density, thereby...