XAS investigation of iron substitution in triclinic FeAPO-34
Arčon, Iztok ...
Ironmodified aluminophosphate with a triclinic form of the chabazite topology FeAPO34, synthesized hydrothermally from a fluoride medium, is analyzed by Fe Kedge XANES and EXAFS. XANES analysis ...reveals that the assynthesized sample contains approximately equal amounts of FeII and FeIII cations, while the oxidation state of iron in the templatefree sample is FeIII. EXAFS analysis confirms the incorporation of iron into different framework sites of the assynthesized FeAPO34 with triclinic symmetry. In the templatefree FeAPO34 with rhombohedral symmetry, iron cations are located on tetrahedral sites, forming catalytically active acid and redox centers.
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