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Updated: May 26, 2025

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
Creation of Heterogeneous Single-Site Catalysts for RWGS Reaction: Ruthenium Complex on Porous Ionic Polymers via
Xingsi Kang1,2,3, Xuehua Zhang4, Qiaodan Yang1
1State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences (CAS), Lanzhou 730000, China.
Abstract:
Heterogeneous single-metal-site catalysts (HSMSCs) have been recognized as promising materials due to the advantages of evenly distributed active metal sites, easy separation, and recyclability. Herein, we construct a single-site Ru catalyst on porous ionic polymers (Ru/PIPs-IL3) via electrostatic interactions, which is a practical and useful strategy for synthesizing HSMSCs. The strong electrostatic interactions (ΔH = -73.4 and -83.5 kJ/mol for Ru-PPh4 and Ru-P(vBn)(vPh)3, respectively) between the quaternary phosphonium cations and oxygen anions of the cyclopentadienyl ligand in Ru species were both consolidated by DFT calculation and X-ray crystallography. The XPS, ATR-IR, HAADF-STEM, and EXAFS analyses and ion exchange experiment were employed to characterize the structure of Ru/PIPs-IL3. These results provide compelling evidence that PIPs-IL3 can interact with Shvo's catalyst in a manner analogous to that observed with quaternary phosphonium (PPh4Cl), thereby anchoring the Ru through electrostatic interactions. Such heterogeneous single-site Ru catalyst Ru/PIPs-IL3 exhibited a twofold activity compared to the homogeneous catalyst with a TONCO of up to 545 and an excellent 98.5% CO selectivity in the low-temperature reverse water-gas shift reaction.
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