Intergrowth structure series

Strictly related to this kind of description are the concepts of Recombination Structures and of Intergrowth Structure Series, to be discussed in the following see 3.9.4. 

TABLE 6. Recurrent ordered intergrowth structures forming homologous series... 

This paper will explore the links between framework structure and catalyst activity in toluene disproportionation (TDP) catalysis. The catalyst system that will be described is an intergrowth of framework types EUO and NES[1] designated NU-85 [2], The paper will describe the crystallisation of a series of intergrowth "members", their characterisation by powder x-ray diffraction and (Transmission) Electron Microscopy and their use in TDP. It will be shown that activity in TDP, as measured by the temperature required to achieve a particular conversion, is directly proportional to specific features in the x-ray powder patterns that are related to the presence of increasing levels of the intergrowth structure. 

The numeric code notation for the intergrowth structures depends on the choice of the initial fragments In the parent structures. As a consequence of this choice, the staictures of a linear homogeneous series can be considered in two different ways. 

The same space groups are possible for the Intergrowth structures of the series BaAl4 - YlrQe2. The only one representative of this series Is Y3Pt4Gee (numeric code which was found by Venturini Malaman (1990). 

TABLE 14.5.1 Ordered intergrowth Structure Forming Homologous Series... 

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