Zeolite analogs

Aoyama Y. Functional Organic Zeolite Analogs Top. Curr. Chem. 1998 198 131-161... 

MOFs can be considered as organic zeolite analogs, as their pore architectures are often reminiscent of those of zeolites a comparison of the physical properties of a series of MOFs and of zeolite NaY has been provided in Table 4.1. Although such coordinative bonds are obviously weaker than the strong covalent Si-O and Al-O bonds in zeolites, the stability of MOF lattices is remarkable, especially when their mainly organic composition is taken into account. Thermal decomposition generally does not start at temperatures below 300 °C [3, 21], and, in some cases. 

Bu, X., Feng, P and Stucky, G.D. (1997) Science, 278 (5346), 2080-2085 Feng, P Bu, X., and Stucky, G.D. (1997) Hydrothermal syntheses and structural characterization of zeolite analogue compounds based on cobalt phosphate. Nature, 388, 735-741 Feng, P Bu, X., Gier, T.E., and Stucky, G.D. (1998) Amine-directed syntheses and crystal structures of phosphate-based zeolite analogs. Microp. Mesoporous Mater., 23 (3-4), 221-229. 

Crystalline semiconducting sulfide and selenide zeolite analogs were synthesized that possess four-connected, three-dimensional tetrahedral networks built from tetravalent... 

P. Feng, X. Bu, T.E. Gier and G.D. Stucky, Amine-directed Syntheses and Crystal Structures of Phosphate-based Zeolite Analogs. Microporous Mesoporous Mater., 1998, 23, 221-229. 

SAPO-34 Zeolite analog widely used as the active ingredient of MTO catalysts ... 

In the MOF PIZA-3 (PIZA, porphyrinic Illinois zeolite analog), Mn(III) is found both in the porphyrin struts and as a structural metal node. The framework is structurally stable and is used for the oxidation of cycUc alkanes and alkenes with iodosylbenzene or peracetic acid as the oxidant [117]. Reaction is found to take place at the outer surface, which is justified by the authors by the unfavorable hydrophilic properties of the pore interior. Yields were similar to those obtained with homogeneous Mn(III) porphyrin systems or those immobilized inside inorganic supports as heterogeneous catalysts. Less than 0.1 mM of metalloporphyrin or degradation products were observed in the reaction mixtures, with no loss of oxidation activity observed in a second run when peracetic acid was used. 

The structure-type 35 is the levyne zeolite analog (51,52). The framework is characterized by alternating layers of hexagonal prisms and six-membered rings in such a manner that every seventh layer is superimposable upon the first. 

Synthesis of zeolite analogs based on other framework compositions have come quite far afield from the original goal. Though the synthesis of all of these phases has utilized methods that have been initially developed to produce aluminosilicate zeolites and silicate molecular sieves, the chemistry of the individual... 

PIZA porphyrinic Illinois zeolite analog STM scanning tunneling microscope... 

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