Supported ionic liquid phase catalysis with supercritical flow

Rapid hydroformylation of 1-octene (rates up to 800 h(-1)) with the catalyst remaining stable for at least 40 h and with very low rhodium leaching levels (0.5 ppm) is demonstrated when using a system involving flowing the substrate, reacting gases and products dissolved in supercritical CO2 (scCO(2)) over a fixed bed supported ionic liquid phase catalyst.