Highly Efficient Ru@IL/AC To Substitute Mercuric Catalyst\nfor Acetylene Hydrochlorination

Abstract

We\nsynthesized a series of Ru@IL/AC catalysts using the incipient wetness\nimpregnation technique associated with five kinds of ionic liquids,\naiming to explore an efficient nonmercuric catalyst for the acetylene\nhydrochlorination reaction. Over the optimal 1%Ru@15%TPPB/AC catalyst,\nthe acetylene conversion was maintained at 99.7% at 48 h (<i>T</i> = 170 °C, GHSV_C₂H₂ = 360 h^–1, and <i>V</i>_HCl/<i>V</i>_C₂H₂ = 1.15).\nAdditionally, with lower Ru loading (0.2%Ru@15%TPPB/AC), the acetylene\nconversion still remained\nat 99.3% within 400 h. Characterized by CO pulse chemisorption, TEM,\nXPS, TGA, among other methods, it is indicated that TPPB IL could\neffectively improve the dispersion of Ru species, suppress the reduction\nof active Ru species, and inhibit the coke deposition during the acetylene\nhydrochlorination reaction. The interactive mechanism between TPPB\nand the reactants and the product was investigated to disclose the\neffect of TPPB IL on the catalytic performance of Ru-based catalyst,\nin combination with DFT calculations. The enhanced activity and long-term\nstability of Ru@IL/AC suggest the promising industrial application\nas the nonmercuric catalyst for acetylene hydrochlorination.