Synthesis and characterization of the all-silica pure polymorph C and an enriched polymorph B intergrowth of zeolite beta

Abstract

Previously elusive, the all-silica pure polymorph C of zeolite beta and a material enriched with polymorph B (see picture) are prepared by high-throughput (HT) synthesis in the presence of a cationic organic structure-directing agent (SDA). The presence of K+ ions is essential for the formation of these materials; furthermore, a high ratio of OH- ions to silicon atoms favors the crystallization of polymorph C. (Chemical Equation Presented). © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.