2017
DOI: 10.1016/j.mcat.2017.04.031
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The states and effects of copper in Keggin-type heteropolyoxometalate catalysts on oxidation of methacrolein to methacrylic acid

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Cited by 34 publications
(15 citation statements)
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“…As shown in Figure A, there was only a binding energy for Mo 6+ present at 233.4 eV, and almost no Mo 5+ was found in the V‐free HPM, revealing a stable Keggin structure. By contrast, in V‐substituted HPMV n , the signals of Mo 3d 5/2 consisted of two peaks corresponding to Mo 6+ and Mo 5+ species at 233.4 and 232.1 eV, respectively, suggesting the presence of partially reduced catalysts during the preparation with little content of Mo 5+ . In addition, the relative content of reduced Mo 5+ grew with the increasing number of V atoms, which was attributed to the removal of the bridging oxygen in the orthorhombic distortion with defect Keggin units .…”
Section: Resultsmentioning
confidence: 66%
See 1 more Smart Citation
“…As shown in Figure A, there was only a binding energy for Mo 6+ present at 233.4 eV, and almost no Mo 5+ was found in the V‐free HPM, revealing a stable Keggin structure. By contrast, in V‐substituted HPMV n , the signals of Mo 3d 5/2 consisted of two peaks corresponding to Mo 6+ and Mo 5+ species at 233.4 and 232.1 eV, respectively, suggesting the presence of partially reduced catalysts during the preparation with little content of Mo 5+ . In addition, the relative content of reduced Mo 5+ grew with the increasing number of V atoms, which was attributed to the removal of the bridging oxygen in the orthorhombic distortion with defect Keggin units .…”
Section: Resultsmentioning
confidence: 66%
“…By contrast, in V-substituted HPMV n , the signals of Mo 3d 5/2 consisted of two peaks corresponding to Mo 6 + and Mo 5 + speciesa t2 33.4 and 232.1 eV,r espectively, suggesting the presence of partially reduced catalysts during the preparation with little content of Mo 5 + . [31,32] In addition, the relative content of reduced Mo 5 + grew with the increasing number of Va toms, which was attributed to the removal of the bridging oxygen in the orthorhombic distortion with defect Keggin units. [31] The spectrumo fV 2p 3/2 in HPMV is shown in Figure 3B.T wo broad peaks of Vw ere observed, at 509.6 and 512.7 eV,w hich could be deconvoluted to V 4 + and V 5 + ,r espectively.T he existence of both V 4 + and V 5 + indicated the exchange of electrons between Vand the Keggin structure and furthers uggested the formation of monomeric pervanadyl (VO 2 + )c ations, which are favorable for the selectivity to FDCA.…”
Section: Catalystp Reparation and Characterizationmentioning
confidence: 99%
“…Copper improves the activity and surface acidity of the catalyst and acts as a promoter. [ 34,35 ] We identified the effective factors to maximize MAA selectivity over VOCu 0.5 /Cs(NH 4 ) 2 PMo 12 O 40 (Cs(NH 4 ) 2 PMo 12 O 40 (VO)Cu 0.5 ). [ 30,33 ]…”
Section: Introductionmentioning
confidence: 99%
“…(1) Heteropolyacids with a Keggin structure composed of P, Mo and V have been utilized as industrial catalysts [1][2][3]. So far, partial substitution of H + in H3PMo12O40 with other cations, substitution of some Mo atoms with V and supporting them on carriers have been investigated to improve the catalytic performance [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, further improvement is still desired.…”
Section: Introductionmentioning
confidence: 99%