1987 Volume 16 Issue 3 Pages 535-538
(VO)2P2O7 is oxidized to β-VOPO4 via β′-phase (d = 4.87, 4.23, 3.19, 2.64 Å) which was probably a phosphate such as VPO4.75 containing vanadium in the average oxidation state of + 4.5. However, when excess phosphorus is present in (VO)2P2O7, oxidation stops at the stage of β′-phase. This suggests that the new phase, β′-VPO4.75, is a selective catalyst for n-butane oxidation to maleic anhydride.
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