Microstructures of V-P-O catalysts derived from VOHPO4·0.5H2O of different crystallite sizes

Selective oxidation of n-butane over nanosized crystallites of (VO)2P2O7 synthesized by an exfoliation–reduction process of VOPO4⋅2H2O in a mixture of 2-butanol and ethanol

“…The apparent shape and size of EC-0 were very similar to those of the corresponding precursor (EP-0, 950 nm (length) × 200 nm (thickness)), as reported previously [21]. However, the particles of EC-0 are polycrystalline, with a drastic increase in the surface area (5 m 2 g -1 → 25 m 2 g -1 ).…”

Nano-sized crystallites of vanadyl pyrophosphate as a highly selective catalyst for n-butane oxidation

“…The apparent shape and length of the catalyst particles derived from P(OSM) and EP(Bu) (denoted C(OSM) and EC(Bu), respectively) were similar to those of the corresponding precursors shown in the SEM images. However, the TEM images of EC(Bu) (inset in figure 2b) clearly show that the particles are polycrystalline and consist of a distinct peripheral shell and nano-sized crystallites of about 50 nm in length inside [19]. Catalyst particles of C(OSM) are also reported to be polycrystalline [20].…”

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

“…We have previously reported that the crystalline size of the precursor VOHPO 4 Á0.5H 2 O influences the microstructure of the resulting catalyst obtained under the reaction conditions [12]. Small size crystallites (1 mm  110 nm) transform into a single-phase of (VO) 2 It has been reported that the addition of water vapor to the reaction gas affects the oxidation of n-butane to MA over (VO) 2 P 2 O 7 .…”