The effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce 0.68 Zr 0.32 O 2 catalyst with texturally stable Ce 0.68 Zr 0.32 O 2 support was investigated. Rh dispersion data were also obtained from Rh particle size analyses made using high-resolution transmission electron microscopy (HRTEM) images. Comparison of the dispersion values obtained by using the two techniques showed that H 2 adsorption at −80 °C is a suitable tool for the estimation of Rh dispersion at reduction temperature, T red, ≤500 °C. For T red > 500 °C, a partial suppression of H 2 chemisorption was observed. However, after a mild reoxidation and low temperature reduction, the H 2 adsorption capacity of these samples was regenerated and good agreement with the HRTEM data was again obtained.
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Gatica et al. (2000) studied this question.
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