Nanometric NaYF4 as an Unconventional Support for Gold Catalysts for Oxidation Reactions

The metal-support interaction plays an important role in gold catalysis. We employ here crystalline cubic (α-) and hexagonal (β-) phases of heterometallic fluoride NaYF 4 nanoparticles (NPs), obtained by the decomposition of a single source precursor [NaY(TFA) 4 (diglyme)] (TFA = trifluoroacetate), as nonoxide supports for gold catalysts. Using an isostructural gadolinium analogue, we also obtained doped α-NaYF 4 :Gd 3+ and β-NaYF 4 :Gd 3+ NPs. A successful deposition of ∼1% by weight gold NPs of average size 5-6.5 nm on these doped and undoped metal fluorides using HAuCl 4 ·3H 2 O afforded Au/NaYF 4 catalysts which were thoroughly characterized by using several physicochemical techniques such as X-ray diffraction, Brunauer-Emmett-Teller analysis, high-resolution transmission electron microscopy, energy-dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy. A comparative study of the above catalysts for different oxidation reactions show that while for the aerobic oxidation of trans -stilbene in solution phase, they are either better (in terms of stilbene conversion) or at par (in terms of trans -stilbene oxide yield) in comparison to the reference catalyst Au/TiO 2 of the World Gold Council, their activity toward CO oxidation reactions in gas phase remains much less than that of gold catalysts supported on metal oxides.