journal article·2025-06-15Open access

Effects of crystallization time and composition of gel for preparing of zeolite K-F

Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China, X. Zhang, Y. H. Sun, Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China, Q. Q. Li, Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China, B. L. Yang, Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China, J. Y. Niu, Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China, M. X. Zhang, Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China

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.
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Research context

OpenAlex topics: Zeolite Catalysis and Synthesis

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