Effects of crystallization time and composition of gel for preparing of zeolite K-F
Source abstract
Abstract
Zeolite K-F crystals were prepared by a hydrothermal route, the effects of crystallization time as well as composition of gel (K2O/SiO2 and Al2O3/SiO2) on the final samples were studied. The results displayed that when heating time was increased to 24 h, cubic aggregates with well-developed faces were observed. In detail, the parent zeolite aggregates with size variation (2-5 um) were composed of flattened cuboid shaped primary crystals. Higher K2O/SiO2 ratio was favorable for the generation of smaller individual primary zeolite K-F nanosized crystals, resulting in forming large steady congregated agglomerates. However, too strong alkalinity resulted in amorphous materials produced. Moreover, batch molar ratio Al2O3/SiO2 determined whether or not zeolite K-F was formed. The product obtained at Al2O3/SiO2=0.15 was a single phase of zeolite W; Well-crystallized zeolite K-F samples were obtained at Al2O3/SiO2 ratios of 0.65, 0.92, 1.45, 2.03 and 2.34. With the Al2O3/SiO2 was increased to 3.05, needle-type hexagonal cancrinite crystals were generated.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Zeolite Catalysis and Synthesis
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