Abstract

Diffuse reflectance spectroscopy in the mid-infrared region (DRIFTS) has become an accepted technique for the analysis of powdered materials. With the advent of commercially available accessories to control atmosphere and temperature, variable-temperature (VT) DRIFTS is now used for the <i>in situ</i> study of a variety of chemical and catalytic reactions. We have used VT-DRIFTS, coupled both on-line and off-line with mass spectrometric detection of volatile reaction products, for the study of a variety of systems. This work has shown that the alkali halide diluent, normally KCI, can have a profound effect on the chemical reactions under study. This report describes results which illustrate the effect of various alkali chlorides on the reaction of palladium acetate [Pd(OAc)₂] with an ethylene/oxygen mixture. This system is of interest to us as a model for the palladium catalyzed synthesis of vinyl acetate.

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