ISSN:
1573-935X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 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 the 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00530587
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