COMPARISON OF IRON AND ALUMINUM SILICATES WITH THE TON TOPOLOGY

A crystalline ferrisilicate analog of ZSM-22 was synthesized and characterized by chemical analysis, XRD, framework i.r., e.s.r., d.t.a./d.t.g., ion-exchange, magnetic susceptibility, and catalytic techniques. Scanning electron micrographs and the sorption of water, n-hexane, and cyclohexane show the absence of amorphous material outside as well as inside the unidimensional channels. An increase in the unit cell parameters, shifts in the framework i.r. bands toward lower frequencies, an e.s.r. signal at g = 4.3, magnetic susceptibility data, and a decrease in the d.t.a. peak temperatures (compared to the Al analog) support the presence of iron in the lattice framework of ZSM-22. The material possesses significant ion-exchange capacities and catalytic activity in the conversion of ethylbenzene.