Heterogeneous Catalytic Hydrogenation with Supported Ionic Liquid Membranes

Abstract

Conference proceedings. Supported ionic liq. membranes (SILMs) were employed to study the catalytic hydrogenation of propene to propane using a 10% Pd/C heterogeneous catalyst. The SILM configuration was asym. in nature with the solid Pd/C catalyst confined to the permeate side of the membrane reactor. Using a catalyst loading of approx. 25 μg cm-2 (based on Pd metal), the heterogeneous catalytic activity was found to follow the order EMI(Imide) [1-ethyl-3-methylimidazolium (CF3SO2)2N-] > DMPIBF4 (1,2-dimethyl-3-propylimidazolium) ≈ BMIPF6 (1-butyl-3-methylimidazolium) ≈ EMI(Triflate) > EMIBF4. High catalyst activity was also found for a noncomplexing perfluorinated oil used in place of the ionic liq. In addn., propene soly. in the ionic liqs. was detd. to be a function of both the perfluoroanion and the aliph. nature of the cation and followed the order DMPIBF4 > BMIPF6 > EMI(Imide) > EMIBF4 > EMI(Triflate). Activity and soly. results are consistent with earlier studies on SILMs contg. a homogeneous hydrogenation catalyst. [on SciFinder(R)]