The effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce0.68Zr0.32O2 catalyst with texturally stable Ce0.68Zr0.32O2 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 H2 adsorption at -80 °C is a suitable tool for the estimation of Rh dispersion at reduction temperature, Tred, ≤500°C. For Tred > 500°C. a partial suppression of H2 chemisorption was observed. However, after a mild reoxidation and low temperature reduction, the H2 adsorption capacity of these samples was regenerated and good agreement with the HRTEM data was again obtained.



Titolo: Rhodium dispersion in a Rh/Ce0.68Zr0.32O2 catalyst investigated by HRTEM and H2 chemisorption
Autori: 
FORNASIERO, Paolo
KASPAR, JAN
mostra contributor esterni 
Data di pubblicazione: 2000
Rivista: 
JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL  
Abstract: The effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce0.68Zr0.32O2 catalyst with texturally stable Ce0.68Zr0.32O2 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 H2 adsorption at -80 °C is a suitable tool for the estimation of Rh dispersion at reduction temperature, Tred, ≤500°C. For Tred > 500°C. a partial suppression of H2 chemisorption was observed. However, after a mild reoxidation and low temperature reduction, the H2 adsorption capacity of these samples was regenerated and good agreement with the HRTEM data was again obtained.
Handle: http://hdl.handle.net/11368/1694241
Digital Object Identifier (DOI): http://dx.doi.org/10.1021/jp994101z
Appare nelle tipologie:1.1 Articolo in Rivista

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