Effect of water vapor on the transformation of VOHPO4·0.5H2O into (VO)2P2O7

VOPO4·H2O: A Stacking Faults Structure Studied by X-ray Powder Diffraction and DFT-D Calculations

“…Indeed, they are actually used in industry for light hydrocarbon oxidation . During the past few years, several studies have been devoted to various catalytic precursors in order to gain some information toward understanding their structural and catalytic behavior. − Among those precursors, the α form of VOPO 4 , denoted α 1 -VOPO 4 according to Tachez, was one of the first structurally characterized. This compound is known to be the main dehydration product of VOPO 4 ·2H 2 O.…”

Partial Oxidation of n-Butane over a Sol-Gel Prepared Vanadium Phosphorous Oxide

“…An exfoliated-reduced precursor in 1-butanol yielded an active phase with 3000 nm crystallite size that gave 53% selectivity to maleic anhydride at a conversion of 50% at 430 °C [7]. When 2-butanol was used as the exfoliating-reducing agent, the active phase with 800 nm crystallites was 75% selective at 50% conversion at 390 °C [16,17,19]. Finally, when the materials were exfoliated with a mixture of 2-butanol and ethanol, the active phase with 50 nm crystallites was 82% selective at 50% conversion at 390 °C [18].…”

“…Small crystallites of the precursor yielded small crystallites of the active phase and were reported as highly selective for the partial oxidation of butane to maleic anhydride [16][17][18]. Those small active crystallites are thought to form when the precursor crystallites break apart [19]. Therefore, synthetic routes that can be oriented to the manipulation of the precursor morphology, crystallite size and surface area are candidates to yield an improved catalyst.…”