Model Iron Phosphate Catalysts for the Oxy-bromination of Methane
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Three kinds of bulk iron phosphates were prepared via different methods and employed as model catalysts in the oxy-bromination of methane (OBM). Na3Fe2(PO4)3 was obtained via a fluoride route for the first time that showed even superior catalytic performance than FePO4. Phase evolution from Na3Fe2(PO4)3 to Na2Fe3(PO4)3 after the OBM was confirmed both by X-ray diffraction and 57Fe Mössbauer spectroscopy. Temperature-programmed reduction of hydrogen and desorption of CH3Br revealed that the redox capacity of iron phosphates were responsible for the generation of bromine radicals on catalyst surfaces while CH3Br-involved reactions likely belonged to gas-phase reactions.
KeywordsIron phosphate Oxy-bromination Methane Methyl bromide Phase evolution
This work was financially supported by the National Natural Science Foundation of China (No. 21103170).