Vanadium-doped sodium phosphomolybdate salts as catalysts in the terpene alcohols oxidation with hydrogen peroxide

Abstract

In this work, we have explored the catalytic activity of Keggin-type heteropolyanions PMo12−nVnO40(3+n)− (n = 0, 1, 2, or 3) in the form of sodium salts in green oxidation routes of terpene alcohols with hydrogen peroxide.

Na4PMo11VO40-catalyzed one-pot oxidative esterification of benzaldehyde with hydrogen peroxide

“…Therefore, the vanadium doping increased their surface area, as demonstrated by BET analysis. 52 In the elemental analysis, the percentual elemental compositions of the sodium phosphomolybdate salts were confirmed by EDS analysis. 52 …”

“… 52 In the elemental analysis, the percentual elemental compositions of the sodium phosphomolybdate salts were confirmed by EDS analysis. 52 …”

“…3SM † ). While the phosphomolybdic acid displayed a value of E i = 680 mV, 52 its unsubstituted and vanadium-monosubstituted sodium salts presented E i values equal to 400 and 370 mV, respectively. However, an increase in vanadium load drastically reduced the acidity strength of the sodium phosphomolybdate salts; the values of E i measured in the solutions of Na 5 PMo 10 V 2 O 40 and Na 6 PMo 9 V 3 O 40 salts were equal to 65 and −100 mV, respectively (Fig.…”

“…The characterization of the vanadium-doped sodium phosphomolybdate catalysts was previously discussed in other work, where they were used in the epoxidation of terpene alcohols with hydrogen peroxide. 52 Notwithstanding, all the important data obtained in the characterization ( i.e. , infrared spectra, powder XRD patterns, EDS analyses, and measurements of the strength of the acidic sites) are shown in the supplemental material (Fig.…”

“…A more detailed characterization and better discussion of the infrared spectra of these catalysts was previously presented when they were used in oxidation reactions of terpenic alcohols. 52 …”