SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF Nu-1, FU-1, AND RELATED ZEOLITES.

The discovery of the striking catalytic properties of the Mobil zeolite ZSM-5 has been followed by a large and intensive research effort both in catalysis promoted by ZSM-5 and in the synthesis and properties of other highly siliceous zeolites. While the distinctions between ZSM-5 and some of the claimed new zeolites are barely perceptible other new, highly-siliceous zeolites differ markedly from ZSM-5/ZSM-11 in structure and consequently in other properties as well. Zeolites Nu-1 and FU-1 have now been fairly well characterized in both physical and catalytic properties. Although their crystal structures have not yet been determined, it is clear that they are different from ZSM-5 (and indeed, any other published zeolite structure). The properties of ZSM-5 have been well reviewed recently, so here published data, both papers and patents, on Nu-1 and FU-1 are brought together to give models of the zeolite which are self-consistent. Some other related, highly siliceous zeolites, Nu-3, Nu-4, Nu-5, Nu-10, EU-1, EU-7, and EU-12 are treated in less detail.