预成型高岭土干胶转化合成NaY型分子筛
收稿日期: 2020-02-22
网络出版日期: 2020-08-12
基金资助
中海油能源发展股份有限公司科技项目(HFKJ-TJY1701)
Synthesis of NaY zeolite from preformed kaolin by dry gel conversion
Received date: 2020-02-22
Online published: 2020-08-12
通过干胶转化法制备了整体式NaY分子筛,采用XRD、SEM及XRF分析表征原料及产物,系统考察了合成体系的n（SiO2）/n（Al2O3）、n（Na2O）/n（SiO2）、水量、晶化温度和晶化时间对整体式NaY分子筛制备的影响。结果表明,合成体系n（SiO2）/n（Al2O3）=7.5时,骨架硅铝比（二氧化硅与氧化铝物质的量比）最大为6.12;n（Na2O）/n（SiO2）逐渐增大,整体式NaY分子筛结晶度逐渐升高,当n（Na2O）/n（SiO2）增至0.35时,会导致P型分子筛的生成;晶化温度从90 ℃逐渐增至120 ℃时,整体式NaY分子筛结晶度也随之升高;在110 ℃下晶化20 h,产物的结晶度达到98%并趋于稳定。干胶转化制备整体式NaY分子筛必须有水的参与,n（H2O）/n（SiO2）为4.2左右对反应物的成型及整体式NaY分子筛的晶化较为适宜。
张耀日 , 臧甲忠 , 张丽娟 , 洪美花 , 于海斌 . 预成型高岭土干胶转化合成NaY型分子筛[J]. 无机盐工业, 2020 , 52(8) : 88 -92 . DOI: 10.11962/1006-4990.2019-0495
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
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