Insight into the role of excess hydroxide ions in silicate condensation reactions
Ha T., Hien D. Tong, Khanh‐Quang Tran, Evert Jan Meijer, Thuat T. Trinh
Abstract
, is the rate-limiting step under these conditions. The excess hydroxide ion aids in the stabilization of the 4-membered-ring structure over the 3-membered-ring structure. Due to a relatively high free-energy barrier, the 4-membered ring is the most difficult of the small silicate structures to dissolve in the backward reaction. This study is consistent with the experimental observation that silicate growth in zeolite synthesis is slower in a very-high-pH environment.
Topics & Concepts
HydroxideSilicateChemistryZeoliteRing (chemistry)IonCondensationInorganic chemistryCondensation reactionActivation energyTetramerPhysical chemistryCatalysisOrganic chemistryThermodynamicsEnzymePhysicsZeolite Catalysis and SynthesisMesoporous Materials and CatalysisClay minerals and soil interactions