Key points are not available for this paper at this time.
Hydrogenation of carbon dioxide (P(H2/CO2)= 5.5/2.5 MPa) into formic acid (HCOOH) under acidic conditions (pH 2.5-5.0) in water has been achieved by using water-soluble ruthenium aqua catalysts (eta6-C6Me6)RuII(L)(OH2)SO4 (L = 2,2'-bipyridine or 4,4'-dimethoxy-2,2' bipyridine).
Hayashi et al. (2004) studied this question.