Crystallisation of silicalite-1 precursors in the amine–(C3H7)4NBr–SiO2–H2O system
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 82 (3) , 801-813
- https://doi.org/10.1039/f19868200801
Abstract
The crystallisation of alkali-metal-free silicalite-1 precursors from the PIPZ–TPABr–SiO2–H2O (PIPZ = piperazine, TPA = tetrapropylammonium) system has been investigated under static and stirred conditions. In many cases large rod-like crystals of (TPA, PIPZ)-silicalite-1 were obtained. The crystallisations were accompanied by decreases in pH caused by the incorporation of base in the crystals. Smaller pH decreases were observed when the PIPZ/SiO2 molar ratio was increased.Keywords
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