▎ 摘　　要

NOVELTY - A sulfur ligand-modified single-atom catalyst comprises active metal component and carrier. The active metal component is supported on carrier in monoatomic dispersion state. The active metal component comprises palladium, platinum, ruthenium, rhodium and/or iridium. The carrier is sulfur-doped carbon material. USE - The sulfur ligand-modified single-atom catalyst is used for selective hydrogenation of alkyne compound to prepare olefin compound (claimed). ADVANTAGE - The catalyst has high catalytic activity for the selective hydrogenation of alkyne compound to prepare olefin compound, and good olefin selectivity and stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the catalyst comprising dispersing sulfur source and carbon material at mass ratio of 1-10 in solvent, mixing, heating to 25-100 degrees C while stirring for 0.5-20 hours, and hydrothermally reacting to 120-250 degrees C for 2-10 hours to obtain sulfur-doped carbon material; dispersing 0.01-1 mol/L active component metal salt and sulfur-doped carbon material in solvent, ultrasonically stirring, evaporating mixed solution at 40-80 degrees C to remove the solvent, and baking solid product at 50-120 degrees C for 4-16 hours; and calcining and reducing at 150-750 degrees C for 0.5-6 hours under reducing atmosphere; and (2) selective hydrogenation of alkyne compound to prepare olefin compound comprising adding alkyne compound and catalyst to solvent comprising water, ethanol, N,N-dimethylformamide, t-butanol, toluene and/or tetrahydrofuran, and filling with 1-3 MPa hydrogen gas at 25-150 degrees C for 1-12 hours. The molar ratio of active metal component to alkyne compound is 0.1-5 mol.%.