3. Results and discussion
3.1 Characterization of zeolites
Fig. 1 showed the powder X-Ray Diffraction (XRD) patterns of various MEL zeolite samples, it was observed that all the synthesized samples exhibited the characteristic peaks (such as 2θ = 7.9o, 8.8o, 14.8o, 23.1oand 23.9o) of MEL topologic framework,23,24indicating that the MEL zeolites were successfully fabricated in present work. No other detectable diffraction peaks for metal phases, such as large iron oxides, were found, which meant the substantial absence of large metal crystallites. In addition, the EDX mapping (Fig. 2a) further demonstrated that the immobilized Fe species were homogeneously distributed throughout the whole MEL zeolite particle.