The Influence of short-chain tetraalkylammonium cations on the recrystallization of magadiite into zeolites

A study on magadiite recrystallization is undertaken to relate the influence of short-chain tetraalkylammonium (TAA+) cations to the zeolite obtained. Using different types of short-chain TAA+ cations under various reactant conditions, OFF, MOR and MFI zeolites are obtained respectively. The infrared spectroscopy (IR), N2 adsorption analysis, thermogravimetry and differential thermal analysis (TG/DTA) of MOR zeolite in the presence or absence of tetraethylammonium (TEA+) cations are carried out for comparison purpose; these results elucidate that TEA+ cations exist in the micropore of MOR zeolite. The roles of TAA+ cations in the recrystallization of magadiite into zeolites are systematically investigated. It is possible that OFF zeolite could be prepared easily when a small quantity of tetramethylammonium (TMA+) cations are used and TEA+ cations interact strongly with MOR zeolite framework. The influence of tetrapropylammonium (TPA+) cations and tetrabutylammonium (TBA+) cations is structure directing on the magadiite recrystallization.