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 Hz adsorption at -80 degrees C is a suitable tool for the estimation of Rh dispersion at reduction temperature, T-red, less than or equal to 500 degrees C. For T-red > 500 degrees 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.
| Original language | English |
|---|---|
| Pages (from-to) | 4667-4672 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry B |
| Volume | 104 |
| Issue number | 19 |
| Publication status | Published - 18 May 2000 |
Keywords
- CE0.5ZR0.5O2 MIXED-OXIDE
- RH/CEO2 CATALYSTS
- OXIDIZING CONDITIONS
- REDOX BEHAVIOR
- 3-WAY CATALYSTS
- CERIA
- SURFACE
- RH
- REDUCTION
- SYSTEMS