Reaction with Supported IL Catalysts

Fine chemicals synthesis via catalytic hydrogenation is an important route in chemical industry. In addition, because of the insolubility of many hydrogenation 

Selective Hydrogenation of Alkyne The SMFs modified by a layer of CNFs (CNFs/SMF) supported nano-Pd for the selective acetylene hydrogenation under continuous-flow conditions [73]. As a typical catalyst, Pd/IL/CNFs/SMF was prepared by impregnation of CNFs/SMF in an acetone solution of Pd(acac)2 (acac. 

The diffusion of Hj is the rate-determining step (RDS) and the lower solubility of ethylene in IL phase compared to acetylene was the reason for the high ethylene selectivity. The selectivity to ethylene could also be improved if the industrial Pd-Ag shell catalyst was modified by attaching IL [BMIm][DCM] or [BMIm][MeHP03] [74]. Commonly, the selectivity to ethylene can be increased from 78-79% to 82%, although acetylene conversion decreased from 40% to 20%. 

The observation of P HIP effects in the heterogeneous hydrogenation reaction over the Pd /SILP/ACF catalyst proves that the catalyst is able to perform pairwise hydrogen addition. For normal hydrogen, it is possible that the main reaction route involves the addition of random H atoms to the substrate, and thus yields no polarization of nuclear spins of the product molecule. 

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