Hydrogenation of CO2 to Formate with a Highly Active Solid Ruthenium Phosphine

Graphical This paper presented a pioneering attempt to employ knitting aromatic polymers (KAPs) immobilized with RuCl 3 as catalysts for formate synthesis. TON as high as 1470000 with an average TOF of 122500 h −1 can be achieved, which are obviously higher than other reported heterogeneous Ru or Ir catalysts. The catalyst can be easily recovered and reused. There is widespread interest in the hydrogenation of CO 2 to produce high-energy substances such as formic acid. Herein, ruthenium trichloride was immobilized on porous phosphine polymers (Ru/KAPs-Ph-PPh 3 ) and gave excellent catalytic activity in the hydrogenation of CO 2 to produce formate. With the assistance of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), a high turnover number (TON) of up to 1470000 was obtained in 12 hours at 120 °C and a total pressure of 6 MPa (P(H 2 )/P(CO 2 )=1 : 1), with average TOFs of 122500 h −1 . Moreover, the catalyst can be easily recovered by filtration with acceptable catalytic effectiveness.