Insights into the growth of small-sized SAPO-34 crystals synthesized by a vapor-phase transport method

Abstract

A dry gel derived from a conventional hydrogel (or an ultrasonically treated hydrogel) containing a low amount of tetraethylammonium hydroxide (TEAOH) was subjected to a vapor-phase transport procedure using morpholine and produced SAPO-34 around 300–500 nm (or below 100 nm). The formation of small crystals has mainly benefited from the increase in tetra-coordinated Al atoms in the dry gel promoted by heating and/or ultrasonic treatment.