Studies on the Synthesis, Properties and Preparation Methods of Zeolite ZK-4

Abstract

Abstract: A zeolite designated as ZK-4 was synthesized hydrothermally in the system (TMA)₂ONa₂O-Al₂O₃- SiO₂- H₂Oat 80 - 100℃ with tetramethylammonium hydroxide as an organic templating agent.The pure zeolite ZK-4 could be prepared by using the mother liquor obtained after filtration as the source of templating agent.The effect of some synthetic conditions such as the amount of tetramethylammonium hydroxide used, n [ (TMA)₂O + Na₂O] /n (Al₂O₃) ratio, n (SiO₂)/n(Al₂O₃) ratio and crystallization time, etc.on the crystalline phase of the product was investigated.When the following molar ratios of the reaction mixture, n (SiO₂)/n (Al₂O₃)₄-10, n[(TMA)₂O+Na₂O]/ n (Al₂O₃ ) > 7, n (Na₂O)/n (Al₂O₃)=0.5-2.0, n (H₂O)/ n(Al₂O₃)=80-450, were used, pure zeolite ZK-4 could be obtained.The synthetic products were characterized by X-ray powder diffraction, atomic absorption spectrophotometry (AAS), adsorption measurement, thermogravimetric analysis(TGA), and 29Si magic angle spinning nuclear magnetic resonance technique.Zeolite ZK-4 has a higher thermal stability than sodium zeolite Adue to higher n(Si)/n(Al) ratio of zeolite ZK-4.

Key words: Zeolite ZK-4, Molecular sieve, Zeolite synthesis, Property, Tetramethylammonium hydroxide template

ZHAO Zhen-hua, YIN Du-lin . Studies on the Synthesis, Properties and Preparation Methods of Zeolite ZK-4[J]. Chemical Research in Chinese Universities, 2000, 16(4): 306-312.

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Studies on the Synthesis, Properties and Preparation Methods of Zeolite ZK-4

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