Synthesis of NaY molecular sieves

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When the silica-alumina ratio of Y-type molecular sieves is below 3.9, it is called low-silica Y-type molecular sieves； When it is above 4.0, it is called a high-silica Y-type molecular sieve. Since 1965, high-silica Y-type molecular sieves have been successfully synthesized in China using methods such as the silica sol method and the silica slag method. However, the silica sol method is costly, and the silica slag method has limited sources; neither can meet the needs of large-scale industrialization in China. When synthesizing Y-type molecular sieves using water glass as a raw material, it is difficult to achieve a silicon-to-aluminum ratio of over 4.0 in the product, and its quality is often unstable. However, if the guiding-agent method is employed to stably synthesize high-silica Y-type molecular sieves, it represents an industrial synthesis route suitable for China’s national conditions. The synthesis of NaY by the guide agent method is described below.