Selective reduction of CO(2) with silanes over platinum nanoparticles immobilised on a polymeric monolithic support
Vijay P Taori1, Rajendar Bandari, Michael R Buchmeiser
1Institute für Polymerchemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart (Germany), Fax: (+49) 711-685-64050.
Abstract:
Here, we demonstrate the use of Pt(0) nanoparticles immobilised on a polymeric monolithic support as a ligand-free heterogeneous catalytic system for the reduction of (13) CO2 at room temperature and atmospheric pressure. The described system effectively reduces (13) CO2 with dihydrosilanes as the hydrogen source to yield a mixture of silylformates, silylacetals and methoxysilanes, which upon further hydrolysis with D2 O, produces their respective C1-type products, that is H(13) COOD, (13) CH2 (OD)2 and (13) CH3 OD. If a monohydrosilane was used as the hydrogen source, a selective reduction of (13) CO2 to a product mixture of only silylformates was observed. Addition of diethylamine to this reaction mixture results in the formation of H(13) COOH and Et2 N(13) CHO. This robust catalytic system is not only maintenance-free and simple to handle, as compared with organometallic and organocatalyst systems, but also shows 3- to 11-fold better catalytic activity and exhibits higher turnover numbers (TONs) up to 21 900 (activity=6.22 kg CO 2 gPt (-1) bar(-1) ).
