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EC number: 406-260-5
CAS number: 58834-75-6
BTN; VPO CATALYST
Vanadyl pyrophophate catalysts have both Brønsted and Lewis acid sites.
The acidic properties indicate that if (VO)2P207 releases into aquatic
environment, the hydrolysis of dissolved (VO)2P207 may proceed
eventually to vanadyl ion (VO2+) and orthophosphate (PO43-). However,
with low water solubility of approx. 12 mg/L, the catalyst is considered
to be stable in aquatic environments. Based on the hydrolysis study of
VO2 from Wehrli et. al (1989) and the first equilibrium constant for the
reaction of P2O74- in aqueous solution at pH 2 to 9 (Crowther, 1953),
the hydrolysis half-life of dissolved (VO)2P207 will be one year or
greater in nature water even at low pH. Therefore the rate of hydrolytic
reaction of the catalyst is slow enough that significant breakdown is
not important under normal environmental conditions.
Wehrli, B. and Stumm, W. (1989). Geochimica et Cosmochimica Acta, vol.
53 (1), 69-77
Crowther, J.P and Westman E.R. (1953), Can. J. Chem. Vol. 32, 42-48.
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