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Ruthenium Complexes Immobilized on an Azolium Based Metal Organic Framework for Highly Efficient Conversion of CO 2 into Formic Acid
Author(s) -
Wu Chao,
Irshad Faisal,
Luo Maowei,
Zhao Yujun,
Ma Xinbin,
Wang Shengping
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801701
Subject(s) - ruthenium , formic acid , catalysis , chemistry , carbene , metal organic framework , hexamethylbenzene , ligand (biochemistry) , medicinal chemistry , metalation , inorganic chemistry , organic chemistry , benzene , biochemistry , receptor , adsorption
A series of efficient heterogenized ruthenium catalysts designated as Rux‐NHC‐MOF (x=1, 2, 3; NHC=N‐heterocyclic carbene; MOF=metal organic framework) were successfully synthesized by the immobilization of different ruthenium complexes RuCl 3 , [RuCp*Cl 2 ] 2 (Cp*=pentamethylcyclopentadienyl) and [Ru(C 6 Me 6 )Cl 2 ] 2 (C 6 Me 6 =hexamethylbenzene) on an azolium based MOF through post‐synthetic metalation. The heterogenized catalysts were subsequently accessed for the catalytic hydrogenation of CO 2 to formic acid. The resulting Ru3‐NHC‐MOF catalyst exhibited the highest activity because of its stronger electron‐donating ability of C 6 Me 6 ligand of [Ru(C 6 Me 6 )Cl 2 ] 2 complex, which is favorable for CO 2 hydrogenation reaction. A high turnover number (TON) value up to 3803 was obtained at 120 °C under a total pressure of 8 MPa (H 2 /CO 2 =1) for 2 h with K 2 CO 3 additive in N,N‐Dimethylformamide (DMF) solvent. Furthermore, the heterogenized Ru3‐NHC‐MOF catalyst was effectively recovered through filtration without significant loss of catalytic activity.