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1 2008

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Selective Oxidation of Light Alkanes on Transition Metal Promoted Vanadyl Pyrophosphate (VPO) Catalysts

Haber J., Stoch J., Zazhigalov V. A., Bacherikova I. V., Cheburakova E. V.

Polish Journal of Chemistry

2008

Vol. 82, nr 9

1839-1852

Vanadyl diphosphate (Identical to vanadyl pyrophosphate) promoted with Bi, Cs, Co and Te was studied as catalyst in the oxidation of propane, n-butane and n-pentane. The additives modified the surface P/V ratio as determined by XPS, and Br?nsted and Lewis acidity, determined by TPD of ammonia and transformation of 2-methyl-3-butyn-2-ol. The specific rate of the oxidation of hydrocarbons correlated with the nucleophilicity of surface oxygenions. With in crease of Lewis acid ity the se lec tiv ity to maleic an hydride in oxidation of n-bu tane increased, whereas in oxidation of n-pentane the selectivity to phthalic an hydride increased and that to maleic an hydride decreased. The mechanism is discussed.