合成条件对高岭土微球原位晶化NaY分子筛的影响
收稿日期: 2019-07-22
网络出版日期: 2020-02-26
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
以高岭土微球为原料,原位合成了NaY分子筛,并详细考察了固液质量比（简称固液比）、碱硅物质的量比（简称碱硅比）、偏高岭土微球与高温焙烧高岭土微球质量比[m（偏土球）/m（高土球）]及外加硅源对Y型分子筛结晶度的影响。研究显示,适当降低固液比和提高碱硅比,可提高Y型分子筛结晶度,但随固液比的降低和碱硅比的提高,微球晶化产物强度和Y型分子筛硅铝物质的量比（简称硅铝比）逐渐下降;采用m（偏土球）/m（高土球）为1∶4混合晶化可提高产物Y型分子筛结晶度至28%,进一步增加m（偏土球）/m（高土球）,产物结晶度变化不大;采用m（偏土球）/m（高土球）为2∶3混合晶化,引入部分白炭黑作为硅源,可在固液比为0.38时,制备出强度高（磨损指数为0.9%）、Y型分子筛硅铝比为4.7、结晶度为37%的高岭土微球晶化产物。
熊晓云 , 魏昭成 , 王久江 , 高雄厚 , 赵红娟 , 胡清勋 . 合成条件对高岭土微球原位晶化NaY分子筛的影响[J]. 无机盐工业, 2020 , 52(1) : 99 -102 . DOI: 10.11962/1006-4990.2019-0114
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
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