Understanding the Anion‐Templated, OSDA‐Free, Interzeolite Conversion Synthesis of High Silica Zeolite ZK‐5**
Magdalena M. Łozińska, Elliott L. Bruce, James D. Mattock, Ruxandra G. Chitac, Paul A. Cox, Alessandro Turrina, Paul A. Wright
Abstract
High silica zeolite ZK-5 (framework Si/Al=4.8) has been prepared by interzeolite conversion from ultrastable zeolite Y via a co-templating route using alkali metal cations and nitrate anions but without organic structure directing agents. The mechanism, which involves zeolite framework - alkali metal cation - nitrate anion ordering, has been established by a combination of chemical and thermal analyses, Raman spectroscopy, computational modelling, and X-ray powder diffraction. Ammonium exchange gives ZK-5 with occluded ammonium nitrate and subsequent heating gives microporous zeolite ZK-5.
Topics & Concepts
ZeoliteMaterials scienceChemical engineeringIonNanotechnologyChemistryCatalysisOrganic chemistryEngineeringZeolite Catalysis and SynthesisChemical Synthesis and CharacterizationMetal-Organic Frameworks: Synthesis and Applications