Table 3 Recyclability of [RuCl2(PTA)4] the carbon dioxide hydrogenation in DMSO.

From: Direct synthesis of formic acid from carbon dioxide by hydrogenation in acidic media

Cycle HCOOH (M) TON
1 1.8 176
2 2.1 206
3 1.8 557
4 1.9 749
  1. [RuCl2(PTA)4] (2.76 mM) was dissolved in DMSO (2 ml) under N2 atmosphere. The system was pressurized at room temperature to 50 bar with CO2 and completed with 50 bar H2. The system was heated at 60 °C and stirred for 120 h until equilibrium of the reaction was reached, average values of several (two to three) measurements are reported with a reproducibility of±15%.