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.
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry