2009
DOI: 10.1007/s10562-009-0114-9
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Redox Properties and Catalytic Oxidation Activities of Polyatom-Substituted H n PW11M1O40 (M = V, Nb, Ta, and W) Keggin Heteropolyacid Catalysts

Abstract: Redox properties and catalytic oxidation activities of polyatom-substituted H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) Keggin heteropolyacids (HPAs) were examined. Reduction potentials and UV-visible absorption edge energies of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts in solution were determined by an electrochemical method and UV-visible spectroscopy measurements, respectively. It was observed that reduction potentials of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts increased and UV-v… Show more

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Cited by 21 publications
(14 citation statements)
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“…Moreover, two little peaks emerged at 29.6 • and 29.9 • in the XRD patterns of H 3 PW 12 O 40 /activated clay, which might be attributed to the crystalline phase of H 3 PW 12 O 40 [17]. The FT-IR spectra (1500-600 cm −1 ) of samples were presented in Figure 1b [18,19]. Compared with the W-O b -W peak reported by [20], the change in peak shape and position might be caused by peak interaction from activated clay.…”
Section: Catalyst Characterizationmentioning
confidence: 96%
“…Moreover, two little peaks emerged at 29.6 • and 29.9 • in the XRD patterns of H 3 PW 12 O 40 /activated clay, which might be attributed to the crystalline phase of H 3 PW 12 O 40 [17]. The FT-IR spectra (1500-600 cm −1 ) of samples were presented in Figure 1b [18,19]. Compared with the W-O b -W peak reported by [20], the change in peak shape and position might be caused by peak interaction from activated clay.…”
Section: Catalyst Characterizationmentioning
confidence: 96%
“…The resultant mixture was stirred for 3 h. Excess water was evaporated on a water bath and the dried catalyst mass was kept for further drying in an air oven for overnight. Finally the sample was calcined at 300 • C for 2 h. TPANb 1 catalyst was prepared according to the procedure reported in the literature [7]. In a typical procedure, 10 g of niobium oxalate was dissolved in 100 ml of 0.1 M oxalic acid solution and 6 g of Na 2 HPO 4 was dissolved in 100 ml of distilled water.…”
Section: Catalyst Preparationmentioning
confidence: 99%
“…The catalytic properties of heteropoly acids (HPAs) can be tuned in a systematic way by exchanging counter-cations and hetero atoms [3][4][5][6]. Park et al studied the acidic and oxidation properties of HPA catalysts by exchanging the identity of addenda atom with group-V metal ions such as V 5+ , Nb 5+ and Ta 5+ [7][8][9].…”
Section: Introductionmentioning
confidence: 99%
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“…[44,45] There are af ew catalytic applications reportedo nt he vanadium-substituted tungstophosphoric (PWV) acids such as oxidation of alcohols [46,47] and benzylamine, [48] bromination of olefins, [49] nitration of phenol, [50] and photooxidative degradation of various organic pollutantsi n water. [51][52][53] To the best of our knowledge,h owever,t he PWVacids-catalyzed selectiveo xidation of inactivated hydrocarbons by O 2 under visible light has rarely been reported so far.I ti s also of interest to learn interesting how to mediate the photocatalytic oxidation performance of PWV acids.…”
Section: Introductionmentioning
confidence: 99%