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Mesoporous Molybdenum–Tungsten Mixed Metal Oxide: A Solid Acid Catalyst for Green, Highly Efficient sp³–sp² C–C Coupling Reactions

Thalgaspitiya, Wimalika R. K., Kapuge, Tharindu Kankanam, He, Junkai, Rathnayake, Dinithi, Kerns, Peter, Suib, Steven L.
ACS applied materials & interfaces 2020 v.12 no.5 pp. 5990-5998
Raman spectroscopy, X-ray photoelectron spectroscopy, benzyl alcohol, catalysts, catalytic activity, energy-dispersive X-ray analysis, micelles, molybdenum, oxidation, porous media, scanning electron microscopy, surface area, surfactants, toluene, transmission electron microscopy, tungsten
A mesoporous molybdenum tungsten mixed metal oxide with high surface area (173 m²/g) was synthesized by using metal dissolution coupled with a surfactant assisted reverse micelle formation synthesis method. Comprehensive characterization of the mixed oxide was performed by using PXRD, Raman, BET, SEM, EDX, TEM, and XPS. Thus, the formation of α-Mo₀.₅W₀.₅O₃ with a homogeneous distribution of Mo and W throughout the material was seen. Furthermore, multiple oxidation states of molybdenum (Mo⁶⁺ and Mo⁵⁺) and a single oxidation state of tungsten (W⁶⁺) were observed. The weak/moderate acidic sites present in the mixed metal oxide resulted in excellent catalytic properties toward the sp³–sp² carbon–carbon coupling reactions. The coupling of benzyl alcohol and toluene was completed within 15 min at 110 °C with 99% yield.