Giant MFI-type zeolite crystals prepared by bulk material dissolution method

Abstract

Giant MFI-type zeolite crystals were synthesized by bulk material dissolution (BMD) method at 473 K employing tetrapropylammonium (TPAOH) as structure directing agent (SDA). The giant crystals were successfully grown up to 2.0 mm in the length direction. The SDA remaining in the crystals could be removed without serious damages to the crystals by a mild heat treatment. In this short paper, size change of giant crystal with process parameters and removal characteristics of SDA are reported.