BEA zeolite modified with iron as effective catalyst for N2O decomposition and selective reduction of NO with ammonia

Abstract BEA zeolite is modified by a two-steps postsynthesis method allowing incorporate iron atoms into the zeolite framework. Two series of the zeolite samples with aluminium (Fe x AlSiBEA) and without aluminium (Fe x SiBEA), containing various iron content (0.5–4.0 Fe wt.%) are obtained. For low Fe content ( 57 Fe Mossbauer and XPS investigations. In contrast, for higher iron content, the framework pseudo-tetrahedral Fe(III) and an extra-framework octahedral Fe(III) species are identified. For Fe x AlSiBEA, significantly higher acidity than for Fe x SiBEA is evidenced by FTIR with adsorption of CO and TPD of NH 3 . Fe x AlSiBEA and Fe x SiBEA are found to be active and selective catalysts of N 2 O decomposition and selective catalytic reduction of NO with ammonia. The highest catalytic activity in both processes are obtained for the Fe 4.0 AlSiBEA sample containing iron mainly as the framework pseudo-tetrahedral Fe(III) and characterized by relatively high acidity.