Abstract
The oxidation states of Rh in NaY supported catalysts have been studied by temperature programmed reduction (TPR). After calcination of the exchanged catalyst to 380°C, both RhO2 and Rh2O3 are identified, besides small amounts of RhO+ and Rh3+. Quantitative reduction is possible for samples calcined at temperatures not exceeding 500°C. Re-oxidation of the reduced samples leads to formation of RhO2 and Rh2O3, with negligible protonolysis to Rh3+. The dioxide prevails after re-oxidation at 320°C, but the sesquioxide after oxidation at 500°C. In the temperature regime where both oxides coexist the reduction of NO with propane is catalyzed even at an O2/C3H8 ratio of 10. Total oxidation of propane reaches 80% at 350°C.
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Schünemann, V., Adelman, B. & Sachtier, W.M.H. Formation of the rhodium oxides Rh2O3 and RhO2 in Rh/NaY. Catal Lett 27, 259–265 (1994). https://doi.org/10.1007/BF00813911
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DOI: https://doi.org/10.1007/BF00813911