Mechanisms of the effect of alkali and alkaline-earth element additives on the properties of V-P-O catalysts of oxidation of n-butane
- and others
The effect of alkali and alkaline-earth element additives on the properties of V-P-O catalysts was investigated. In entering the lattice of the basic phase of vanadyl pyrophosphate, they act as electron donors, increasing the effective negative charge on the oxygen atom and facilitating cleavage of a proton from the paraffin molecule, which increases the oxidation rate. A simultaneous increase in the surface acidity due to diffusion of phosphorus causes an increase in selectivity. At the same time, perturbations of the structure of pyrophosphate on addition of the additives (determined by the concentration and radius of the added ion) decrease the selectivity of the process. Elements with a small ionic radius in low concentrations in the basic composite are most promising for modification of the properties of V-P-O catalysts.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 159571
- Journal Information:
- Theoretical and Experimental Chemistry, Vol. 30, Issue 2; Other Information: PBD: Sep 1994; TN: Translated from Teoreticheskaya i Eksperimental`naya Khimiya; 30: No. 2, 80-84(Mar-Apr 1994)
- Country of Publication:
- United States
- Language:
- English
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