Design and operational limits of an ATR-FTIR spectroscopic microreactor for investigating reactions at liquid–solid interface

Abstract This work presents the design and characterization of an optimized attenuated total reflection (ATR) microfluidic cell to assess intrinsic kinetic parameters of reactions at the liquid/solid interface under chemical control. A theoretical and computational investigation of convection, diffusion, and adsorption is presented. Transport dynamics in transient-flow experiments is characterized by a convective and diffusive mass transport of the solution species to the surface of the ATR crystal. Criteria to determine the mass transport limitations of the adsorption process are presented as a function of the Damkohler and Biot numbers. The CO adsorption on a thin film of platinum is studied in order to validate the model.

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