Evolution of the crystal growth mechanism of zeolite W (MER) with temperature

The morphology of zeolite W (MER topology) synthesized from Hydrated Silicate Ionic Liquids (HSILs) shows a distinct temperature dependence, reflected in a fundamental difference in the underlying crystal growth mechanism as revealed by Atomic Force Microscopy (AFM). Zeolite W crystals obtained at 90 °C develop in a highly supersaturated solution through birth and spread growth, whereas synthesis at 175 °C results in elongated, spiral grown zeolite W particles. Supersaturation was measured through the concentration of dissolved aluminate, being the limiting species. The evolution of the aluminum concentration during crystallization at different temperatures was monitored with 27Al Nuclear Magnetic Resonance (NMR) spectroscopy. Supersaturation conditions determine the nucleation rate, the prevailing crystal growth mechanism, and resulting crystal morphology.

Publication year:2019

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IOF-keylabel:yes

BOF-publication weight:2

CSS-citation score:1

Authors:International

Authors from:Higher Education

Accessibility:Open