Publications by authors named "Gerald Djega-Mariadassou"
Article Synopsis
- The study investigates a Rh-oxidised species in a specific Rh(0.29)/Ce0.68Zr0.32O2 catalyst with unusual CO-O2 kinetics, utilizing various analytical methods.
- Findings, particularly from N2-FTIR (first-time application on this catalyst), indicate that Rh exists primarily as electron-deficient clusters (Rhndelta+) after a reduction process at high temperature.
- Additionally, CO-FTIR experiments suggest that these electron-deficient species are influenced by the reduced support and neighboring Cl anions, while the presence of CO reveals RhI(CO)2 species as well.
The low-temperature adsorption of N(2) on Rh/SiO(2) samples of various particle-size distributions was followed by FTIR. The addition of O(2) pulses on Rh(0) surfaces saturated with chemisorbed N(2) allowed us to reassign stretching frequencies attributed originally to N(2)-Rh(0) to N(2)-Rh(delta+). The formation of the latter oxidized Rh species is assumed to be induced by an electron withdrawal from adsorbed oxygen species on Rh surface centers neighboring those onto which N(2) species are chemisorbed.
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