High-efficiency catalysis of Ru-based catalysts assisted by triazine-based ligands containing different heteroatoms (N, O, S) for acetylene hydrochlorination.

• The catalysts were prepared by coordinating Ru precursor with triazine-based ligands. • The coordination contributes to the dispersion of active species. • The interaction enhanced the adsorption and activation of reactants. • DFT calculation shows that the complexation can reduce the reaction energy barrier. Ru/AC catalyst used in acetylene hydrochlorination reaction has several drawbacks such as poor dispersion, metal loss, serious carbon deposition, and insufficient active sites. To address these issues of traditional Ru/AC, in this study, the supported Ru-L x /AC catalysts were synthesized by the coordination of ruthenium precursor and several structural triazine ligands. The complexation of heteroatomic structure to Ru atom formed a local active domain, which is more conducive to the synergistic adsorption and activation of the initial reactants, and further optimizes the reaction microenvironment. The spatial topological structure with conjugated structures effectively promoted the transfer of electrons between the heteroatoms and the ruthenium precursors, facilitating the stabilization of active Ru species. The newly developed synthetic process also increased dispersion of reaction components and impeded the sintering of ruthenium components promoted by the local structural forces. The optimum Ru-1,3,5-triazine/AC (Ru-L 1 /AC) catalyst exhibited 162% higher acetylene conversion than the benchmark Ru/AC catalyst. The significantly improved activity and stability of the optimized catalyst will have a huge application prospect in industry. Efficient acetylene hydrochlorination: The coordination between ruthenium and heteroatom ligands promotes the transfer of electrons between the heteroatoms and the metal precursor, ensuring the continuous and efficient catalysis of the catalyst. [Display omitted] [ABSTRACT FROM AUTHOR]