Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 32, Pages 10134-10140Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800416
Keywords
azo compounds; germanium; microporous materials; structure elucidation; zeolites
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Funding
- Academy of Sciences of the Czech Republic [1QS400400560]
- Grant Agency of the Czech Republic [203/08/0604]
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The investigation of the critical synthesis parameters of germanosilicate of UTL topology, possessing 14- and 12-rings, has been carried Out in detail. (6R,10S)-6,10-Dimethyl-5-azoniaspiro[4.5]decane hydroxide was used as the structure-directing agent (SDA). The kinetics of the synthesis, the role of the Si/Ge ratio in the synthesis mixture, and the effect of the calcination procedure were investigated in relation to the crystallinity and textural properties of the synthesized material. The optimum synthesis time was found to be six days for Si/Ge and (Si+Ge)/SDA molar ratios of 2 and 1.7. respectively. The UTL zeolite crystallizes as small sheets of 10 mu m in size. The micropore volume of the best crystals is 0.22 cm(3) g(-1) with a micropore diameter of 1.05 nm, based on DFT and Saito-Foley analyses of adsorption data.
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