Abstract
The structure and redox properties of low-loaded (0.015–0.73 wt% Fe) FeO x /SiO 2 catalysts obtained by adsorption– precipitation of Fe 2+ were probed by Mössbasuer and TPR techniques. Oxide dispersion data, obtained by deconvolution of Mössbasuer and TPR spectra, signal the speciation of the active phase into “ isolated” FeO x sites, “2- d FeO x patches” and “3- d Fe 2 O 3 clusters”. The reactivity of FeO x /SiO 2 catalysts in the selective oxidation of CH 4 and C 3H 8 in the range 475–650 °C has been assessed. Basic relationships amongst dispersion, specific rate of alkane conversion and product formation signal that the selective oxidation functionality depends upon local environment and oxygen bond strength of active sites, their distribution being closely related to the efficiency of synthesis route.
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