Extra-large Microporous Compounds

Cp 2 Co(III)OH was prepared by the reaction of tetramethylcyclopentadienyl (Aldrich) as ligands with Co(III) cations. By using Cp 2 Co(III)OH as the SDA, UTD-1 crystals were synthesized from a reaction mixture of 1.0 Si02 0.125 Cp 2 CoOH 0.1 NaOH 60H2O, stirred and aged at room temperature for 1 h, and then heated at 175 °C for 2d in 

Typical compounds Ring number Year of discovery SDA and synthesis system Framework composition Channel size 

VSB-1 24 1999 tris(2-aminoethyl) amine (TREN), F system Ni, P 8.8 A, 1-D channel 

Organic templates Cp 2 Co+ are usually occluded in the as-synthesized UTD-1. The typical method to remove these organic species from pores is that the samples are heated at 500 °C to decompose Cp 2 Co+ to cobalt oxide, followed by treatment with HC1 to remove cobalt oxide, and then are washed by water and dried in air. The obtained UTD-1 molecular sieve has good thermal stability, and its crystal lattices remain stable upon being heated to 1000 °C. The synthesis of Al-containing high-silicate UTD-1 is very difficult, which needs a two-step synthesis in general. 

JDF-20 was synthesized by using TEA as the SDA in an alcoholic solvent with weak polarity, such as diethylene glycol, triethylene glycol, tetraethylene glycol, or 1,4-butanediol, whereas AIPO4-5 would be formed if a solvent with high polarity (ethylene glycol or ethanol) were used under the same reaction condition and composition. 

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Table 5.18 Extra-large microporous compounds and their corresponding SDAs...

As opposed to the extra-large microporous high-silica compounds UTD-1 and CIT-5, which are templated by bulky organic cations with low charge density, many metal... 

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