NONAQUEOUS SYNTHESIS - IRON ALUMINOSILICATES WITH THE ZSM-48 STRUCTURE

A crystalline, iron-containing material having framework structure of the ZSM-48 zeolite has been synthesized in a nonaqueous system of triethylamine and ethylenediamine. The XRD patterns of the as-synthesized as well as the calcined FeZSM-48 matched well with that of ZSM-48 synthesized hydrothermally; replacement of Al3+ by Fe3+ in the zeolite lattice was confirmed by spectroscopic (XRD, framework i.r., and e.s.r.) results, and the M3+ (M = Al, Fe)-rich composition of the ZSM-48 materials was determined. Framework i.r. bonds of ZSM-48 are shifted toward lower frequencies on incorporation of iron in the framework; the white color of the as-synthesized as well as that calcined samples of iron-substituted ZSM-48 and e.s.r. (g = 4.3) data indicate that Fe-O-Fe interactions are absent.