A spectroscopic study on the 12-heteropolyacids of molybdenum and tungsten (H3PMo12−nWnO40) combined with cetylpyridinium bromide in the epoxidation of cyclopentene

Influence of peroxometallic intermediaries present on polyoxometalates nanoparticles surface on the adipic acid synthesis

“…In addition, the emergence of a broad band about 290-350 nm takes place. These experimental observations have been also reported by other authors [24,36]. The correct identification of these bands is difficult owing to the different interpretations found in the literature [37][38][39][40].…”

Fabrication and Application of a Novel Modified Electrode Based on Multiwalled Nanotubes/Cerium(III) 12‐Tungstophosphoric Acid Nanocomposite

“…Then the solution was diluted to 10 mL using 0.1 M PBS (pH 7.0). Figure 1 shows the IR spectrum of MWNTs and CePW/ MWNTs, In the case of CePW/MWNTs, four peaks characteristic of PW 12 O 3À 4 [36] were observed, the bands at 1077, 981, 894 and 821 cm À1 assignable to the asymmetric stretching vibration of P À O bond in the central PO 4 tetrahedron, the stretching vibration of W ¼ O t , W À O b À W, and W À O c À W groups, respectively. These are in good agreement with those reported earlier [37].…”

Comparative study of the catalytic preparation of flavones using Keggin heteropolyacids under homogeneous, heterogeneous and solvent free conditions

“…Varied reactions are currently catalyzed by HPAs, among them, dehydration [21], esterification [22], amine oxidation and olefin epoxidation [23] The Molnár group has reported several examples of the use of heteropolyacids [24,25] including dehydration reactions [26].…”