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Keywords:

  • hydrogenation;
  • microfluidic devices;
  • microreactors;
  • rhodium;
  • supported catalysts

Abstract

A glass-fabricated microfluidic device was used to screen a series of homogeneous alkene hydrogenation reactions by using Wilkinson’s catalyst. Good to excellent conversions were achieved for a range of alkene substrates within short reaction times (<2 min) and low hydrogen pressures (<0.2 MPa). During the course of the screening procedure, a metallic Rh layer was found to build up on the channels of the microfluidic device. Further investigation of this layer revealed that it was a highly active catalyst for the hydrogenation of alkenes, enones, and alkynes. Furthermore, this Rh layer catalyzed the hydrogenation of toluene to methylcyclohexane.