预成型高岭土干胶转化合成NaY型分子筛

doi:10.11962/1006-4990.2019-0495

摘要/Abstract

摘要：

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。

关键词: 整体式分子筛, 干胶转化, NaY分子筛, 高岭土

Abstract:

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

中图分类号:

TQ131.12

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.

Zhang Yaori,Zang Jiazhong,Zhang Lijuan,Hong Meihua,Yu Haibin. Synthesis of NaY zeolite from preformed kaolin by dry gel conversion[J]. Inorganic Chemicals Industry, 2020, 52(8): 88-92.

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样品	w （Al₂O₃）	w （SiO₂）	w （SO₃）	w （K₂O）	w （CaO）	w （TiO₂）	w （Fe₂O₃）
K	44.5	51.7	1.460	0.554	0.161	0.376	0.586
K-650	46.6	50.8	0.273	0.553	0.159	0.371	0.618
SK-650	23.6	74.1	0.313	0.253	0.127	0.451	0.285

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