SYNTHESIS OF IRON-SILICATE ANALOGS OF ZEOLITE-BETA

Crystalline beta zeolites containing iron have been prepared and characterized. Evidence for the presence of Fe in the lattice framework is obtained from chemical analysis, XRD, framework i.r., e.s.r., and solid-state MAS n.m.r. spectroscopies, d.t.a/t.g., magnetic susceptibility, and catalytic activity data. Chemical analysis and n.m.r. confirm the absence of a significant amount of Al in the zeolite. ( SiO2 Al2O3 > 2000). The sample was white in color. Lattice Fe leads to increase in the X-ray "d" values. D.t.a. studies indicate that Beta (Fe) has lower thermal stability, of the crystal than does the Al analog. The framework i.r. bands are shifted to lower frequencies on Fe incorporation in the lattice. E.s.r. and magnetic susceptibility data indicate the presence of well-dispersed tetrahedral Fe3+. Beta (Fe) possesses significant activity in the isomerization of m-xylene. © 1990.