Isomerization size-dependent mechanism

The isomerization reactions shown in equation (6.42) can proceed selectively depending on the catalyst used in the process. Aluminosilicates are typical for selective isomerization of aromatic compounds, because they have well defined pore sizes depending on the type of aluminosilicate. The mechanism of selective isomerization can be explained based on Figure 6.9. 

As shown in Section 17.1, the various hydrocarbon isomerization mechanisms are clearly size dependent i.e. they take place on separated surface sites. Obviously, their relative importance should be dependent on the same weighted d-band center. This is summarized schematically in Fig. 17.6 [32]. 

In Section 2.3 the structural and optical properties of neutral and cationic Na clusters at r = 0 K as functions of size are presented and compared with experimental data recorded at low temperature. The temperature-dependent line-broadening will be illustrated by the example of Na9, since in this case a comparison with experimental data at different temperatures is particularly instructive. In Section 2.4 the results of ab initio molecular dynamics (AIMD) studies on Li9 will serve to show different temperature behavior of distinct types of structures as well as their isomerization mechanisms. The study of possible metal-insulator transitions and segregation into metallic and ionic parts in finite systems carried out on prototypes of nonstoichiometric alkali halide and alkali hydride clusters with single and multiple excess electrons is presented in Section 2.5. A comparison of structural and optical characteristics of Na F and lAnUm (n > m) series allows us to illustrate the influence of different bonding properties. 

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