An antimony(V) substituted Keggin heteropolyacid, H 4PSbMo 11O 40: Why is its catalytic activity in oxidation reactions so different from that of H 4PVMo 11O 40?

Hila Goldberg; Devesh Kumar; G. Narahari Sastry; Gregory Leitus; Ronny Neumann

doi:10.1016/j.molcata.2011.12.033

An antimony(V) substituted Keggin heteropolyacid, H ₄PSbMo ₁₁O ₄₀: Why is its catalytic activity in oxidation reactions so different from that of H ₄PVMo ₁₁O ₄₀?

Hila Goldberg, Devesh Kumar, G. Narahari Sastry, Gregory Leitus, Ronny Neumann^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

An antimony(V) containing α-Keggin type acidic polyoxometalate, H ₄PSbMo ₁₁O ₄₀, was prepared by reacting NaMoO ₄, H ₃PO ₄ and Sb ₂O ₃ in the presence of aqua regia to appraise its reactivity compared to the well known vanadate analog, H ₄PVMo ₁₁O ₄₀. Characterization was by X-ray diffraction, MALDI-TOF MS, IR, UV-vis and ³¹P NMR spectroscopy. Catalytic redox reactions, such as oxidative dehydrogenation using O ₂ and N ₂O as terminal oxidants were studied and showed very different reactivity of H ₄PSbMo ₁₁O ₄₀ versus H ₄PVMo ₁₁O ₄₀. It was found by DFT calculations that in contrast to analogous H ₄PVMo ₁₁O ₄₀ where vanadium centered catalysis is observed, in H ₄PSbMo ₁₁O ₄₀ catalysis is molybdenum and not antimony centered.

Original language	English
Pages (from-to)	152-157
Number of pages	6
Journal	Journal of Molecular Catalysis A: Chemical
Volume	356
DOIs	https://doi.org/10.1016/j.molcata.2011.12.033
State	Published - Apr 2012
Externally published	Yes

Keywords

Antimony
DFT
Molybdenum
Oxidation
Polyoxometalate

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title = "An antimony(V) substituted Keggin heteropolyacid, H 4PSbMo 11O 40: Why is its catalytic activity in oxidation reactions so different from that of H 4PVMo 11O 40?",

abstract = "An antimony(V) containing α-Keggin type acidic polyoxometalate, H 4PSbMo 11O 40, was prepared by reacting NaMoO 4, H 3PO 4 and Sb 2O 3 in the presence of aqua regia to appraise its reactivity compared to the well known vanadate analog, H 4PVMo 11O 40. Characterization was by X-ray diffraction, MALDI-TOF MS, IR, UV-vis and 31P NMR spectroscopy. Catalytic redox reactions, such as oxidative dehydrogenation using O 2 and N 2O as terminal oxidants were studied and showed very different reactivity of H 4PSbMo 11O 40 versus H 4PVMo 11O 40. It was found by DFT calculations that in contrast to analogous H 4PVMo 11O 40 where vanadium centered catalysis is observed, in H 4PSbMo 11O 40 catalysis is molybdenum and not antimony centered.",

keywords = "Antimony, DFT, Molybdenum, Oxidation, Polyoxometalate",

author = "Hila Goldberg and Devesh Kumar and Sastry, {G. Narahari} and Gregory Leitus and Ronny Neumann",

year = "2012",

month = apr,

doi = "10.1016/j.molcata.2011.12.033",

language = "אנגלית",

volume = "356",

pages = "152--157",

journal = "Journal of Molecular Catalysis A: Chemical",

issn = "1381-1169",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - An antimony(V) substituted Keggin heteropolyacid, H 4PSbMo 11O 40

T2 - Why is its catalytic activity in oxidation reactions so different from that of H 4PVMo 11O 40?

AU - Goldberg, Hila

AU - Kumar, Devesh

AU - Sastry, G. Narahari

AU - Leitus, Gregory

AU - Neumann, Ronny

PY - 2012/4

Y1 - 2012/4

N2 - An antimony(V) containing α-Keggin type acidic polyoxometalate, H 4PSbMo 11O 40, was prepared by reacting NaMoO 4, H 3PO 4 and Sb 2O 3 in the presence of aqua regia to appraise its reactivity compared to the well known vanadate analog, H 4PVMo 11O 40. Characterization was by X-ray diffraction, MALDI-TOF MS, IR, UV-vis and 31P NMR spectroscopy. Catalytic redox reactions, such as oxidative dehydrogenation using O 2 and N 2O as terminal oxidants were studied and showed very different reactivity of H 4PSbMo 11O 40 versus H 4PVMo 11O 40. It was found by DFT calculations that in contrast to analogous H 4PVMo 11O 40 where vanadium centered catalysis is observed, in H 4PSbMo 11O 40 catalysis is molybdenum and not antimony centered.

AB - An antimony(V) containing α-Keggin type acidic polyoxometalate, H 4PSbMo 11O 40, was prepared by reacting NaMoO 4, H 3PO 4 and Sb 2O 3 in the presence of aqua regia to appraise its reactivity compared to the well known vanadate analog, H 4PVMo 11O 40. Characterization was by X-ray diffraction, MALDI-TOF MS, IR, UV-vis and 31P NMR spectroscopy. Catalytic redox reactions, such as oxidative dehydrogenation using O 2 and N 2O as terminal oxidants were studied and showed very different reactivity of H 4PSbMo 11O 40 versus H 4PVMo 11O 40. It was found by DFT calculations that in contrast to analogous H 4PVMo 11O 40 where vanadium centered catalysis is observed, in H 4PSbMo 11O 40 catalysis is molybdenum and not antimony centered.

KW - Antimony

KW - DFT

KW - Molybdenum

KW - Oxidation

KW - Polyoxometalate

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SN - 1381-1169

VL - 356

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JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

ER -

An antimony(V) substituted Keggin heteropolyacid, H ₄PSbMo ₁₁O ₄₀: Why is its catalytic activity in oxidation reactions so different from that of H ₄PVMo ₁₁O ₄₀?

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Keywords

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