Impact of surface mobility in selective oxidation. Isotopic exchange of O-18(2) with O-16(2) on various oxides: MoO3, SnO2 and Sb2O4. Effect of a reducer gas
(1996) Catalysis Today — Vol. 32, n° 1-4, p. 329-336 (1996)
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- Abstract
- Isotopic oxygen exchange experiments were carried out on simple oxides (Sb2O4, MoO3 and SnO2) and mechanical mixtures of MoO3 or SnO2 (acceptor phase) with Rh/Al2O3 or Sb2O4 (donor phase). With Rh/Al2O3 a synergy effect is found: the amount of oxygen exchanged on the mixture is higher than the sum of oxygen exchanged on the two separate phases. This is a prove of oxygen mobility between donor and acceptor phases. With Sb2O4 this effect is less marked suggesting that the presence of a reducer gas is required. In presence of hydrocarbon, no isotopic exchange is observed: only total oxidation occurs. The presence of Sb2O4 decreases the rate of total oxidation by blocking, by oxygen spillover, the most active sites for oxidation.
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Martin, D., Kaur, P., Duprez, D., Gaigneaux, E., Ruiz, P., & Delmon, B. (1996). Impact of surface mobility in selective oxidation. Isotopic exchange of O-18(2) with O-16(2) on various oxides: MoO3, SnO2 and Sb2O4. Effect of a reducer gas. Catalysis Today, 32(1-4), 329-336. https://doi.org/10.1016/S0920-5861(96)00092-2 (Original work published 1996)