Catalysis Science & Engineering, Poster
CE-113

Catalytic conversion of CO2 to formate mediated by an aliphatic Pd-PCP pincer complex

L. Federer1, C. Adlhart1*, C. Frech1
1ZHAW

We report the palladium-catalyzed transformation of CO2 and H2 to formate at low pressure (2 bar) and ambient temperature in presence of a base. Palladium-hydride complex 1 was synthesized from its chloride precursor with NaH in THF. The 1H-NMR spectrum shows a triplet at δ -3.40 ppm with a 2JP-H coupling constant of 20.7 Hz. The formate complex 2 was obtained by exposing 1 to CO2 as indicated by a triplet signal in the 1H-NMR spectrum at δ 9.18 ppm with a 4JP-H coupling constant of 1.7 Hz and a singlet signal at δ 166.6 ppm in the broadband decoupled 13C-NMR spectrum. After degassing of complex 2, addition of a base and application of a H2-atmosphere regenerated the hydride complex 1, thus completing the proposed catalytic cycle. The formation of formic acid was confirmed by NMR and headspace GC-MS measurements after treatment with HCl.