Inorganic Chemicals Industry >
Synthesis of NaY zeolite from preformed kaolin by dry gel conversion
Received date: 2020-02-22
Online published: 2020-08-12
Monolithic NaY zeolite was synthesized by dry gel conversion method.XRD,SEM and XRD were used to study the raw materials and products.The influences of n（SiO2）/n（Al2O3）,n（Na2O）/n（SiO2）,water content,crystallization temperature and crystallization time on the preparation of monolithic NaY zeolite were systematically investigated.Experimental results showed that when n（SiO2）/n（Al2O3） of synthesis system was 7.5,the n（SiO2）/n（Al2O3） of framework was 6.12.The crystallinity of the NaY zeolite increased with the amount of n（Na2O）/n（SiO2） firstly.If n（Na2O）/n（SiO2） was above 0.35,the NaY zeolite would turn to P zeolite.When the crystallization temperature increased from 90 ℃ to 120 ℃,the crystallinity of product increased accordingly.After crystallization at 110 ℃ for 20 h,the crystallinity of product was 98% and stated stable.Water was the key factor in the process of dry gel conversion.When the n（H2O）/n（SiO2） reached about 4.2,it was good for the synthesis of NaY zeolite.
Key words： monolithic zeolite; dry gel conversion; NaY zeolite; kaolin
Yaori Zhang , Jiazhong Zang , Lijuan Zhang , Meihua Hong , Haibin Yu . Synthesis of NaY zeolite from preformed kaolin by dry gel conversion[J]. Inorganic Chemicals Industry, 2020 , 52(8) : 88 -92 . DOI: 10.11962/1006-4990.2019-0495
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