The rate-determining step of the ethylene oxychlorination reaction on CuCl2/γ-Al2O3 catalyst could be identified by an in situ, time-resolved XANES study. According to these data (see figure; E=photon energy) and the simultaneously determined catalyst activity, the rate-determining step is the oxidation of CuCl. The dopant potassium chloride, added to the industrial catalysts, decreases the rate of the reduction step, which becomes the rate-determining step for the KCl/CuCl2/γ-Al2O3 catalyst.
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Lamberti et al. (2002) studied this question.
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