Fk. Hannour et al., AMMOXIDATION OF TOLUENE ON VANADYL POLYPHOSPHATES - VO(PO3)(2),1 - SYNTHESIS AND CHARACTERIZATION OF THE PARENT SAMPLES, Reaction kinetics and catalysis letters, 63(2), 1998, pp. 225-233
Vanadyl polyphosphates with a P/V ratio = 2 (crystalline alpha-VO(PO3)
(2) and beta-VO(PO3)(2) as well as amorphous VO(PO3)(2)) were synthesi
zed, starting from usually prepared precursor VO(H2PO4)(2) but pursuin
g new methods using V2O5/H3PO4 as well as VOHPO4 . 1/2 H2O/H3PO4, too.
The products were characterized by chemical analysis and X-ray diffra
ctometry. In situ ESR spectroscopy was used as a tool to predict their
catalytic activity in the ammoxidation reaction.