A series of SiO2-supported tungstate catalysts was investigated with operando Raman spectroscopy during OCM reaction at elevated temperatuers and Density Functional Theory. The supported WOx/SiO2 catalysts were synthesized by impregnation of aqueous ammonium meta-tungstate with varying loadings of tungsten oxide and found to contain surface WOx sites and crystalline WO3 nanoparticles (NPs), the latter predominating at higher loadings. The addition of Na2O and MnO promoters resulted in the formation of crystalline Na2WO4 and MnWO4 NPs as well as promoted WOx sites. The cutting edge experimental and theoretical studies provided new molecular level insights not previously reported in the literature. The role of all these different tungsten oxide sites for OCM will be presented. The new fundamental insights to be presented reveal and develop a new catalyst model for OCM by supported WOx/SiO2 catalysts.

New fundamental molecular level insights into oxidative coupling of methane (OCM) by SiO2-supported tungstate catalysts

254th National Meeting (2017)

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