Abstract
In this study, the activity and selectivity to Fe-ZSM-5, Fe-Beta, and Fe-FER catalysts were studied at 350 °C for the partial oxidation of methane using N2O as oxidant. Spectroscopic and solid characterization tools including H2-TPR, in situ IR, N2 gas adsorption, CO chemisorption, and TGA-MS were used in the investigation. Ammonia adsorption data suggested that among the studied zeolites, H-FER zeolite contained the highest concentration of framework Al atoms, which are essential for the formation of active extra-framework Fe species. The oxidation state and redox active species of Fe-ZSM-5, Fe-Beta, and Fe-FER catalysts were studied by H2-TPR, which disclosed the presence of a unique reduction peak (originating from N2O pretreatment) centered at approximately 235 °C over the samples. The hydrogen consumption peak was more prominent over Fe-FER than other catalysts, demonstrating that the Fe-FER catalyst contained more active sites for N2O conversion in comparison to Fe-Beta and Fe-ZSM-5 catalysts. For I...
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