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Effect of synthesizing conditions on NaY zeolite prepared by in-situ crystallization from kaolin microspheres
Received date: 2019-07-22
Online published: 2020-02-26
NaY zeolite was in-situ synthesized with kaolin microspheres as raw material.The effects of synthesis conditions on the crystallinity of Y zeolite were investigated in detail,such as mass ratio of solid-to-liquid,amount-of-substance ratio of alkali-to-silica,mass ratio of metakaolin to fully calcined kaolin microspheres and silicon sources.Results showed that the crystallinity of Y zeolite could be improved by properly reducing solid-to-liquid ratio and increasing alkali-to-silica ratio.But with the decrease of the solid-to-liquid ratio and the increase of the alkali-to-silica ratio,the attrition index of the products and the amount-of-substance ration of silica to alumina of Y zeolite decreased gradually.The crystallinity of Y zeolite could be increased to 28% with the mass ratio of metakaolin to fully calcined kaolin microspheres was 1∶4.However,with the further increase of the mass ratio of metakaolin to fully calcined kaolin microspheres,the crystallinity of Y zeolite changed little.Under the condition of the mass ratio of metakaolin to fully calcined kaolin microspheres of 2∶3 and solid-liquid ratio of 0.38 and using silica aerogel as partial silica source,the as-synthesized product had 37% Y crystallinity and its SiO2/Al2O3 was 4.7.Also,the product showed good attrition index with 0.9%.
Key words: kaolin; NaY zeolite; in-situ crystallization
Xiaoyun Xiong , Zhaocheng Wei , Jiujiang Wang , Xionghou Gao , Hongjuan Zhao , Qingxun Hu . Effect of synthesizing conditions on NaY zeolite prepared by in-situ crystallization from kaolin microspheres[J]. Inorganic Chemicals Industry, 2020 , 52(1) : 99 -102 . DOI: 10.11962/1006-4990.2019-0114
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